RISK FACTORS

An investment in our securities involves a high degree of risk and should be considered speculative. An investment in our securities should only be undertaken by those persons who can afford the total loss of their investment. You should carefully consider the risks and uncertainties described below, as well as other information contained in this prospectus. The risks and uncertainties below are not the only ones we face. Additional risks and uncertainties not presently known to us or that we believe to be immaterial may also adversely affect our business. If any of the following risks occur, our business, financial condition and results of operations could be seriously harmed and you could lose all or part of your investment. Further, if we fail to meet the expectations of the public market in any given period, the market price of our common shares could decline, which could cause the value of our Series II First Preferred Shares to decline. We operate in a highly competitive environment that involves significant risks and uncertainties, some of which are outside of our control.

Risks Related to our Business and our Industry

We expect to incur future losses and we may never become profitable .

We have incurred losses of $12.9 million, $4.3 million and $1.1 million during 2014, 2013 and 2012, respectively, and expect to incur an operating loss in 2015. We have an accumulated deficit since inception through December 31, 2014 of $50.6 million. We believe that operating losses will continue in and beyond 2015 because we are planning to incur significant costs associated with the preclinical and clinical development of SIRP a Fc. Our net losses have had and will continue to have an adverse effect on, among other things, our shareholders’ equity, total assets and working capital. We expect that losses will fluctuate from quarter to quarter and year to year, and that such fluctuations may be substantial. We cannot predict when we will become profitable, if at all.

We currently have no product revenue and will not be able to maintain our operations and research and development without additional funding.

To date, we have generated no product revenue and cannot predict when and if we will generate product revenue. Our ability to generate product revenue and ultimately become profitable depends upon our ability, alone or with partners, to successfully develop our product candidates, obtain regulatory approval and commercialize products, including any of our current product candidates, or other product candidates that we may develop, in-license or acquire in the future. We do not anticipate generating revenue from the sale of products for the foreseeable future. We expect our research and development expenses to increase substantially in connection with our ongoing activities, particularly as we advance our product candidates into clinical trials.

Our prospects depend on the success of our product candidates, which are at early stages of development, and we may not generate revenue for several years, if at all, from these products.

Given the early stage of our product development, we can make no assurance that our research and development programs will result in regulatory approval or commercially viable products. To achieve profitable operations, we, alone or with others, must successfully develop, gain regulatory approval and market our future products. We currently have no products that have been approved by the U.S. Food and Drug Administration, or FDA, Health Canada, or HC, or any similar regulatory authority. To obtain regulatory approvals for our product candidates being developed and to achieve commercial success, clinical trials must demonstrate that the product candidates are safe for human use and that they demonstrate efficacy. While SIRP a Fc has begun preclinical studies to support an IND application, we have not yet completed cGMP manufacturing, formal toxicology studies, a phase I clinical trial or subsequent required clinical trials. Our CD200 program is ready to enter formal IND-enabling preclinical studies, but we do not plan to initiate these studies until we have a development partner to share in the cost and responsibility of the program.

Many product candidates never reach the stage of clinical testing and even those that do have only a small chance of successfully completing clinical development and gaining regulatory approval. Product candidates may fail for

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a number of reasons, including, but not limited to, being unsafe for human use or due to the failure to provide therapeutic benefits equal to or better than the standard of treatment at the time of testing. Unsatisfactory results obtained from a particular study relating to a research and development program may cause us or our collaborators to abandon commitments to that program. Positive results of early preclinical research may not be indicative of the results that will be obtained in later stages of preclinical or clinical research. Similarly, positive results from early- stage clinical trials may not be indicative of favorable outcomes in later-stage clinical trials. We can make no assurance that any future studies, if undertaken, will yield favorable results. We can make no assurances that toxicology studies in non-human primates will yield results that will allow us to proceed with clinical trials in humans.

The early stage of our product development makes it particularly uncertain whether any of our product development efforts will prove to be successful and meet applicable regulatory requirements, and whether any of our product candidates will receive the requisite regulatory approvals, be capable of being manufactured at a reasonable cost or be successfully marketed. If successful in developing our current and future product candidates into approved products, we will still experience many potential obstacles such as the need to develop or obtain manufacturing, marketing and distribution capabilities. If we are unable to successfully commercialize any of our products, our financial condition and results of operations may be materially and adversely affected.

We rely and will continue to rely on third parties to plan, conduct and monitor our preclinical studies and clinical trials, and their failure to perform as required could cause substantial harm to our business.

We rely and will continue to rely on third parties to conduct a significant portion of our preclinical and clinical development activities. Preclinical activities include in vivo studies providing access to specific disease models, pharmacology and toxicology studies, and assay development. Clinical development activities include trial design, regulatory submissions, clinical patient recruitment, clinical trial monitoring, clinical data management and analysis, safety monitoring and project management. If there is any dispute or disruption in our relationship with third parties, or if they are unable to provide quality services in a timely manner and at a feasible cost, our active development programs will face delays. Further, if any of these third parties fails to perform as we expect or if their work fails to meet regulatory requirements, our testing could be delayed, cancelled or rendered ineffective.

We rely on contract manufacturers over whom we have limited control. If we are subject to quality, cost or delivery issues with the preclinical and clinical grade materials supplied by contract manufacturers, our business operations could suffer significant harm.

We have limited manufacturing experience and rely on contract manufacturing organizations, or CMOs, to manufacture our product candidates for larger preclinical studies and clinical trials. We produce small quantities of our product candidates at bench scale in our laboratory facilities for use in smaller preclinical studies. We rely on CMOs for manufacturing, filling, packaging, storing and shipping of drug product in compliance with cGMP regulations applicable to our products. The FDA ensures the quality of drug products by carefully monitoring drug manufacturers’ compliance with cGMP regulations. The cGMP regulations for drugs contain minimum requirements for the methods, facilities and controls used in manufacturing, processing and packing of a drug product.

We have contracted with Catalent Pharma Solutions, LLC, or Catalent, for the manufacture of the SIRP a Fc protein needed for our pre-IND toxicology and pharmacology studies and to supply drug product for our phase I clinical trial. The manufacture of recombinant proteins uses well established processes including a protein expression system. Catalent is producing SIRP a Fc using their proprietary GPEx ^® expression system. We believe that Catalent has the capacity, the systems and the experience to supply SIRP a Fc for our planned phase I clinical trial and we may consider using Catalent for manufacturing for later clinical trials. However, since the Catalent manufacturing facility where SIRP a Fc is being produced was only recently established, it has not been inspected by the FDA. Any manufacturing failures or delays or compliance issues could cause delays in the completion of our preclinical studies of SIRP a Fc, and delays in the submission or approval of our IND and the initiation of our phase I clinical trial.

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There can be no assurances that CMOs will be able to meet our timetable and requirements. We have not contracted with alternate suppliers in the event Catalent is unable to scale up production, or if Catalent otherwise experiences any other significant problems. If we are unable to arrange for alternative third-party manufacturing sources on commercially reasonable terms or in a timely manner, we may be delayed in the development of our product candidates. Further, contract manufacturers must operate in compliance with cGMP and failure to do so could result in, among other things, the disruption of product supplies. Our dependence upon third parties for the manufacture of our products may adversely affect our profit margins and our ability to develop and deliver products on a timely and competitive basis.

If clinical trials of our product candidates fail to demonstrate safety and efficacy to the satisfaction of regulatory authorities or do not otherwise produce positive results, we would incur additional costs or experience delays in completing, or ultimately be unable to complete, the development and commercialization of our product candidates.

Before obtaining marketing approval from regulatory authorities for the sale of our product candidates, we must conduct preclinical studies in animals and extensive clinical trials in humans to demonstrate the safety and efficacy of the product candidates. Clinical testing is expensive and difficult to design and implement, can take many years to complete and has uncertain outcomes. The outcome of preclinical studies and early clinical trials may not predict the success of later clinical trials, and interim results of a clinical trial do not necessarily predict final results. A number of companies in the pharmaceutical and biotechnology industries have suffered significant setbacks in advanced clinical trials due to lack of efficacy or unacceptable safety profiles, notwithstanding promising results in earlier trials. We do not know whether the clinical trials we may conduct will demonstrate adequate efficacy and safety to result in regulatory approval to market any of our product candidates in any jurisdiction. A product candidate may fail for safety or efficacy reasons at any stage of the testing process. A major risk we face is the possibility that none of our product candidates under development will successfully gain market approval from the FDA or other regulatory authorities, resulting in us being unable to derive any commercial revenue from them after investing significant amounts of capital in multiple stages of preclinical and clinical testing.

If we experience delays in clinical testing, we will be delayed in commercializing our product candidates, and our business may be substantially harmed.

We cannot predict whether any clinical trials will begin as planned, will need to be restructured or will be completed on schedule, or at all. Our product development costs will increase if we experience delays in clinical testing. Significant clinical trial delays could shorten any periods during which we may have the exclusive right to commercialize our product candidates or allow our competitors to bring products to market before us, which would impair our ability to successfully commercialize our product candidates and may harm our financial condition, results of operations and prospects. The commencement and completion of clinical trials for our products, including our planned SIRP a Fc phase I clinical trial, may be delayed for a number of reasons, including delays related, but not limited, to:

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Our product development costs will increase if we experience delays in testing or approval or if we need to perform more or larger clinical trials than planned. Additionally, changes in regulatory requirements and policies may occur, and we may need to amend study protocols to reflect these changes. Amendments may require us to resubmit our study protocols to regulatory authorities or IRBs or ethics committees for re-examination, which may impact the cost, timing or successful completion of that trial. Delays or increased product development costs may have a material adverse effect on our business, financial condition and prospects.

If we have difficulty enrolling patients in clinical trials, the completion of the trials may be delayed or cancelled.

As our product candidates advance from preclinical testing to clinical testing, and then through progressively larger and more complex clinical trials, we will need to enroll an increasing number of patients that meet our eligibility criteria. There is significant competition for recruiting cancer patients in clinical trials, and we may be unable to enroll the patients we need to complete clinical trials on a timely basis or at all. The factors that affect our ability to enroll patients are largely uncontrollable and include, but are not limited to, the following:

If we are unable to successfully develop companion diagnostics for our therapeutic product candidates, or experience significant delays in doing so, we may not achieve marketing approval or realize the full commercial potential of our therapeutic product candidates.

We plan to develop companion diagnostics for our therapeutic product candidates. We expect that, at least in some cases, regulatory authorities may require the development and regulatory approval of a companion diagnostic as a condition to approving our therapeutic product candidates. We have limited experience and capabilities in developing or commercializing diagnostics and plan to rely in large part on third parties to perform these functions. We do not currently have any agreement in place with any third party to develop or commercialize companion diagnostics for any of our therapeutic product candidates.

Companion diagnostics are subject to regulation by the FDA, HC and comparable foreign regulatory authorities as medical devices and may require separate regulatory approval or clearance prior to commercialization. If we,

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or any third parties that we engage to assist us, are unable to successfully develop companion diagnostics for our therapeutic product candidates, or experience delays in doing so, our business may be substantially harmed.

Regulatory approval processes are lengthy, expensive and inherently unpredictable. Our inability to obtain regulatory approval for our product candidates would substantially harm our business.

Our development and commercialization activities and product candidates are significantly regulated by a number of governmental entities, including the FDA, HC and by comparable authorities in other countries. Regulatory approvals are required prior to each clinical trial and we may fail to obtain the necessary approvals to commence or continue clinical testing. We must comply with regulations concerning the manufacture, testing, safety, effectiveness, labeling, documentation, advertising and sale of products and product candidates and ultimately must obtain regulatory approval before we can commercialize the product candidate. The time required to obtain approval by such regulatory authorities is unpredictable but typically takes many years following the commencement of preclinical studies and clinical trials. Any analysis of data from clinical activities we perform is subject to confirmation and interpretation by regulatory authorities, which could delay, limit or prevent regulatory approval. Even if we believe results from our clinical trials are favorable to support the marketing of our product candidates, the FDA or other regulatory authorities may disagree. In addition, approval policies, regulations, or the type and amount of clinical data necessary to gain approval may change during the course of a product candidate’s clinical development and may vary among jurisdictions. We have not obtained regulatory approval for any product candidate and it is possible that none of our existing product candidates or any future product candidates will ever obtain regulatory approval.

We could fail to receive regulatory approval for our product candidates for many reasons, including, but not limited to:

A regulatory authority may require more information, including additional preclinical or clinical data to support approval, which may delay or prevent approval and our commercialization plans, or we may decide to abandon the development program. If we were to obtain approval, regulatory authorities may approve any of our product candidates for fewer or more limited indications than we request, may grant approval contingent on the performance of costly post-marketing clinical trials, or may approve a product candidate with a label that does not include the labeling claims necessary or desirable for the successful commercialization of that product candidate. Moreover, depending on any safety issues associated with our product candidates that garner approval, the FDA may impose a risk evaluation and mitigation strategy, thereby imposing certain restrictions on the sale and marketability of such products.

We will require additional capital to finance our operations, which may not be available to us on acceptable terms, or at all. As a result, we may not complete the development and commercialization of our product candidates or develop new product candidates.

As a research and development company, our operations have consumed substantial amounts of cash since inception. We expect to spend substantial funds to continue the research, development and testing of our product

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candidates that are in the preclinical testing stages of development, and to prepare to commercialize products subject to FDA approval in the U.S. and similar approvals in other jurisdictions. We will also require significant additional funds if we expand the scope of our current clinical plans for the SIRP a Fc program or if we were to acquire any new assets and advance those towards clinical testing. Therefore, for the foreseeable future, we will have to fund all of our operations and development expenditures from cash on hand, equity or debt financings, through collaborations with other biotechnology or pharmaceutical companies or through financings from other sources. We expect that our existing cash at December 31, 2014 of $26,165,056 will enable us to fund our current operating plan requirements into the fourth quarter of 2016. Additional financing will be required to meet our long term liquidity needs. If we do not succeed in raising additional funds on acceptable terms, we might not be able to complete planned preclinical studies and clinical trials or pursue and obtain approval of any product candidates from the FDA and other regulatory authorities. It is possible that future financing will not be available or, if available, may not be on favorable terms. The availability of financing will be affected by the achievement of our corporate goals, the results of scientific and clinical research, the ability to obtain regulatory approvals, the state of the capital markets generally and with particular reference to drug development companies, the status of strategic alliance agreements and other relevant commercial considerations. If adequate funding is not available, we may be required to delay, reduce or eliminate one or more of our product development programs, or obtain funds through corporate partners or others who may require us to relinquish significant rights to product candidates or obtain funds on less favorable terms than we would otherwise accept. To the extent that external sources of capital become limited or unavailable or available on onerous terms, our intangible assets and our ability to continue our clinical development plans may become impaired, and our assets, liabilities, business, financial condition and results of operations may be materially or adversely affected.

We face competition from other biotechnology and pharmaceutical companies and our financial condition and operations will suffer if we fail to effectively compete.

The biotechnology and pharmaceutical industries are intensely competitive and subject to rapid and significant technological change. Our competitors include large, well-established pharmaceutical companies, biotechnology companies, and academic and research institutions developing cancer therapeutics for the same indications we are targeting and competitors with existing marketed therapies. Many other companies are developing or commercializing therapies to treat the same diseases or indications for which our product candidates may be useful. Although there are no approved therapies that specifically target the CD47 pathway, some competitors use therapeutic approaches that may compete directly with our product candidates. For example, SIRP a Fc is in direct competition with CD47 blocking antibodies from Stanford University, Celgene Corporation and Novimmune SA.

Many of our competitors have substantially greater financial, technical and human resources than we do and have significantly greater experience than us in conducting preclinical testing and human clinical trials of product candidates, scaling up manufacturing operations and obtaining regulatory approvals of products. Accordingly, our competitors may succeed in obtaining regulatory approval for products more rapidly than we do. Our ability to compete successfully will largely depend on:

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If we are not able to compete effectively against our current and future competitors, our business will not grow and our financial condition and operations will substantially suffer.

We heavily rely on the capabilities and experience of our key executives and scientists and the loss of any of them could affect our ability to develop our products.

The loss of Dr. Niclas Stiernholm, our President and Chief Executive Officer, or other key members of our staff, including Dr. Robert Uger, our Chief Scientific Officer, James Parsons, our Chief Financial Officer, or Dr. Penka Petrova, our Vice President, Drug Development, could harm us. We have employment agreements with Drs. Stiernholm, Uger and Petrova and Mr. Parsons, although such employment agreements do not guarantee their retention. We also depend on our scientific and clinical collaborators and advisors, all of whom have outside commitments that may limit their availability to us. In addition, we believe that our future success will depend in large part upon our ability to attract and retain highly skilled scientific, managerial, medical, clinical and regulatory personnel, particularly as we expand our activities and seek regulatory approvals for clinical trials. We routinely enter into consulting agreements with our scientific and clinical collaborators and advisors, key opinion leaders and academic partners in the ordinary course of our business. We also enter into contractual agreements with physicians and institutions who will recruit patients into our clinical trials on our behalf in the ordinary course of our business. Notwithstanding these arrangements, we face significant competition for these types of personnel from other companies, research and academic institutions, government entities and other organizations. We cannot predict our success in hiring or retaining the personnel we require for continued growth. The loss of the services of any of our executive officers or other key personnel could potentially harm our business, operating results or financial condition.

Our employees may engage in misconduct or other improper activities, including noncompliance with regulatory standards and requirements, which could have a material adverse effect on our business.

We are exposed to the risk of employee fraud or other misconduct. Misconduct by employees could include failures to comply with FDA regulations, provide accurate information to the FDA, comply with manufacturing standards we have established, comply with federal and state health-care fraud and abuse laws and regulations, report financial information or data accurately or disclose unauthorized activities to us. In particular, sales, marketing and business arrangements in the healthcare industry are subject to extensive laws and regulations intended to prevent fraud, kickbacks, self-dealing and other abusive practices. These laws and regulations may restrict or prohibit a wide range of pricing, discounting, marketing and promotion, sales commission, customer incentive programs and other business arrangements. Employee misconduct could also involve the improper use of information obtained in the course of clinical trials, which could result in regulatory sanctions and serious harm to our reputation. If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a substantial impact on our business and results of operations, including the imposition of substantial fines or other sanctions.

We may expand our business through the acquisition of companies or businesses or by entering into collaborations or by in-licensing product candidates, each of which could disrupt our business and harm our financial condition.

We have in the past and may in the future seek to expand our pipeline and capabilities by acquiring one or more companies or businesses, entering into collaborations or in-licensing one or more product candidates. For example, in April 2013, we acquired Trillium Privateco to acquire novel cancer therapeutics, an experienced scientific management team and internal development capabilities. We licensed intellectual property relating to methods and compounds for the modulation of the SIRP a -CD47 interaction for therapeutic cancer applications from University Health Network, or UHN, and Hospital for Sick Children, or HSC. In April 2013, we also in-licensed tigecycline which was subsequently returned to the UHN in 2014. Acquisitions, collaborations and in-licenses involve numerous risks, including, but not limited to:

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We have experience in making acquisitions, entering collaborations and in-licensing product candidates, however, we cannot provide assurance that any acquisition, collaboration or in-license will result in short-term or long-term benefits to us. We may incorrectly judge the value or worth of an acquired company or business or in-licensed product candidate. In addition, our future success would depend in part on our ability to manage the rapid growth associated with some of these acquisitions, collaborations and in-licenses. We cannot assure you that we would be able to successfully combine our business with that of acquired businesses, manage a collaboration or integrate in-licensed product candidates. Furthermore, the development or expansion of our business may require a substantial capital investment by us.

Negative results from clinical trials or studies of others and adverse safety events involving the targets of our products may have an adverse impact on our future commercialization efforts .

From time to time, studies or clinical trials on various aspects of biopharmaceutical products are conducted by academic researchers, competitors or others. The results of these studies or trials, when published, may have a significant effect on the market for the biopharmaceutical product that is the subject of the study. The publication of negative results of studies or clinical trials or adverse safety events related to our product candidates, or the therapeutic areas in which our product candidates compete, could adversely affect our share price and our ability to finance future development of our product candidates, and our business and financial results could be materially and adversely affected.

We face the risk of product liability claims, which could exceed our insurance coverage and produce recalls, each of which could deplete our cash resources.

We are exposed to the risk of product liability claims alleging that use of our product candidates caused an injury or harm. These claims can arise at any point in the development, testing, manufacture, marketing or sale of our product candidates and may be made directly by patients involved in clinical trials of our product candidates, by consumers or healthcare providers or by individuals, organizations or companies selling our products. Product liability claims can be expensive to defend, even if the product or product candidate did not actually cause the alleged injury or harm.

Insurance covering product liability claims becomes increasingly expensive as a product candidate moves through the development pipeline to commercialization. We currently maintain clinical trial liability insurance coverage of $10 million. However, there can be no assurance that such insurance coverage is or will continue to be adequate or available to us at a cost acceptable to us or at all. We may choose or find it necessary under our collaborative agreements to increase our insurance coverage in the future. We may not be able to secure greater or broader product liability insurance coverage on acceptable terms or at reasonable costs when needed. Any liability for damages resulting from a product liability claim could exceed the amount of our coverage, require us to pay a substantial monetary award from our own cash resources and have a material adverse effect on our business, financial condition and results of operations. Moreover, a product recall, if required, could generate substantial negative publicity about our products and business, inhibit or prevent commercialization of other products and product candidates or negatively impact existing or future collaborations.

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In addition, some of our licensing and other agreements with third parties require or might require us to maintain product liability insurance. If we cannot maintain acceptable amounts of coverage on commercially reasonable terms in accordance with the terms set forth in these agreements, the corresponding agreements would be subject to termination, which could have a material adverse impact on our operations.

We may not achieve our publicly announced milestones according to schedule, or at all.

From time to time, we may announce the timing of certain events we expect to occur, such as the anticipated timing of results from our clinical trials. These statements are forward-looking and are based on the best estimates of management at the time relating to the occurrence of such events. However, the actual timing of such events may differ from what has been publicly disclosed. The timing of events such as initiation or completion of a clinical trial, filing of an application to obtain regulatory approval, or announcement of additional clinical trials for a product candidate may ultimately vary from what is publicly disclosed. For example, we cannot provide assurances that the SIRP a Fc phase I clinical trial will be initiated on schedule, if at all, or that we will make regulatory submissions or receive regulatory approvals as planned. These variations in timing may occur as a result of different events, including the nature of the results obtained during a clinical trial or during a research phase, problems with a CMO or a CRO or any other event having the effect of delaying the publicly announced timeline. We undertake no obligation to update or revise any forward-looking information, whether as a result of new information, future events or otherwise, except as otherwise required by law. Any variation in the timing of previously announced milestones could have a material adverse effect on our business plan, financial condition or operating results and the trading price of common shares.

We are exposed to the financial risk related to the fluctuation of foreign exchange rates and the degrees of volatility of those rates.

We may be adversely affected by foreign currency fluctuations. To date, we have been primarily funded through issuances of equity, proceeds from the exercise of warrants and stock options and from interest income on funds available for investment, which are all denominated in Canadian dollars. A growing portion of our expenditures are in U.S. dollars, however, and we are, therefore, subject to foreign currency fluctuations which may, from time to time, impact our financial position and results of operations.

Risks Related to Intellectual Property

If we are unable to adequately protect and enforce our intellectual property, our competitors may take advantage of our development efforts or acquired technology and compromise our prospects of marketing and selling our key products.

We own or hold licenses to a number of U.S.-issued patents and U.S. and Canadian pending patent applications, as well as foreign patents and foreign counterparts. In the U.S., we have our own rights to five key issued patents and two pending key patent applications. In addition, we have numerous patent applications pending in Europe, Australia, China, India and Japan. Our success will depend in part upon our ability to protect our intellectual property and proprietary technologies and upon the nature of the intellectual property protection we receive. For example, some of our patent portfolio covers primarily methods of use but not compositions of matter. The ability to compete effectively and to achieve partnerships will depend on our ability to develop and maintain proprietary aspects of our technology and to operate without infringing on the proprietary rights of others. The presence of such proprietary rights of others could severely limit our ability to develop and commercialize our products, to conduct our existing research and/or require financial resources to defend litigation, which may be in excess of our ability to raise such funds. There is no assurance that our pending patent applications or those that we intend to acquire will be approved in a form that will be sufficient to protect our proprietary technology and gain or keep any competitive advantage that we may have.

The patent positions of pharmaceutical companies can be highly uncertain and involve complex legal, scientific and factual questions for which important legal principles remain unresolved. Patents issued to us or our

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respective licensors may be challenged, invalidated or circumvented. To the extent our intellectual property, including licensed intellectual property, offers inadequate protection, or is found to be invalid or unenforceable, we are exposed to a greater risk of direct competition. If our intellectual property does not provide adequate protection against our competitors’ products, our competitive position could be adversely affected, as could our business, financial condition and results of operations. Both the patent application process and the process of managing patent disputes can be time consuming and expensive, and the laws of some foreign countries may not protect our intellectual property rights to the same extent as do the laws of Canada and the United States.

We will be able to protect our intellectual property from unauthorized use by third parties only to the extent that our proprietary technologies, key products and any future products are covered by valid and enforceable patents or are effectively maintained as trade secrets and provided we have the funds to enforce our rights, if necessary.

If we lose our licenses from third-party owners we may be unable to continue a substantial part of our business.

We are party to a number of licenses that give us rights to intellectual property that is necessary or useful for a substantial part of our business. Pursuant to our exclusive license agreement with UHN and HSC under which we license certain patent rights for our key products and their uses, we are required to use commercially reasonable efforts to commercialize products based on the licensed rights and pay certain royalties and sublicensing revenue to UHN and HSC. These licenses require that we pay development milestone payments, regulatory milestone payments, royalties on net sales and sublicensing revenues as well as annual maintenance fees. See “Business – General Development of the Business – Acquisition of Trillium Privateco” in this prospectus for additional information regarding this license agreement.

We have also entered into agreements allowing us to manufacture SIRP a Fc using Catalent’s proprietary GPEx ^® expression system. The consideration includes payments at the time we successfully reach a series of development and sales milestones. We may also enter into licenses in the future to access additional third-party intellectual property.

If we fail to pay annual maintenance fees, development and sales milestones, or it is determined that we did not use commercially reasonable efforts to commercialize licensed products, we could lose our licenses, which could have a material adverse effect on our business and financial condition.

We may require additional third-party licenses to effectively develop and manufacture our key products and are currently unable to predict the availability or cost of such licenses.

A substantial number of patents have already been issued to other biotechnology and pharmaceutical companies. To the extent that valid third-party patent rights cover our products or services, we or our strategic collaborators would be required to seek licenses from the holders of these patents in order to manufacture, use or sell these products and services, and payments under them would reduce our profits from these products and services. We are currently unable to predict the extent to which we may wish or be required to acquire rights under such patents and the availability and cost of acquiring such rights, or whether a license to such patents will be available on acceptable terms or at all. There may be patents in the U.S. or in foreign countries or patents issued in the future that are unavailable to license on acceptable terms. Our inability to obtain such licenses may hinder or eliminate our ability to manufacture and market our products.

Changes in patent law and its interpretation could diminish the value of patents in general, thereby impairing our ability to protect our product candidates.

As is the case with other biotechnology and pharmaceutical companies, our success is heavily dependent on intellectual property, particularly patents. Obtaining and enforcing patents in the biopharmaceutical industry involves technological and legal complexity, and obtaining and enforcing biopharmaceutical patents is costly,

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time-consuming and inherently uncertain. The U.S. Supreme Court has ruled on several patent cases in recent years, either narrowing the scope of patent protection available in certain circumstances or weakening the rights of patent owners in certain situations. In addition to increasing uncertainty with regard to our and our licensors’ or collaborators’ ability to obtain patents in the future, this combination of events has created uncertainty with respect to the value of patents, once obtained. Depending on decisions by the U.S. Congress, the federal courts, and the U.S. Patent and Trademark Office, or USPTO, the laws and regulations governing patents could change in unpredictable ways that would weaken our and our licensors’ or collaborators’ ability to obtain new patents or to enforce existing patents and patents we and our licensors or collaborators may obtain in the future.

Recent patent reform legislation could increase the uncertainties and costs surrounding the prosecution of our and our licensors’ or collaborators’ patent applications and the enforcement or defense of our or our licensors’ or collaborators’ issued patents. On September 16, 2011, the Leahy-Smith America Invents Act, or the Leahy-Smith Act, was signed into law. The Leahy-Smith Act includes a number of significant changes to U.S. patent law. These include provisions that affect the way patent applications are prosecuted and may also affect patent litigation. The USPTO recently developed new regulations and procedures to govern administration of the Leahy-Smith Act, and many of the substantive changes to patent law associated with the Leahy-Smith Act, and in particular, the first to file provisions, only became effective on March 16, 2013. Accordingly, it is not clear what, if any, impact the Leahy-Smith Act will have on the operation of our business. However, the Leahy-Smith Act and its implementation could increase the uncertainties and costs surrounding the prosecution of our or our licensors’ or collaborators’ patent applications and the enforcement or defense of our or our licensors’ or collaborators’ issued patents, all of which could have a material adverse effect on our business and financial condition.

Litigation regarding patents, patent applications and other proprietary rights may be expensive, time consuming and cause delays in the development and manufacturing of our key products.

Our success will depend in part on our ability to operate without infringing the proprietary rights of third parties. The pharmaceutical industry is characterized by extensive patent litigation. Other parties may have, or obtain in the future, patents and allege that the use of our technologies infringes these patent claims or that we are employing their proprietary technology without authorization.

In addition, third parties may challenge or infringe upon our existing or future patents. Proceedings involving our patents or patent applications or those of others could result in adverse decisions regarding:

If we are unable to avoid infringing the patent rights of others, we may be required to seek a license, defend an infringement action or challenge the validity of the patents in court. Regardless of the outcome, patent litigation is costly and time consuming. In some cases, we may not have sufficient resources to bring these actions to a successful conclusion. In addition, if we do not obtain a license, develop or obtain non-infringing technology, fail to defend an infringement action successfully or have infringed patents declared invalid, we may:

Even if we are successful in these proceedings, we may incur substantial costs and divert management time and attention in pursuing these proceedings, which could have a material adverse effect on us.

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Our reliance on third parties requires us to share our trade secrets, which increases the possibility that a competitor will discover them.

Because we rely on third parties to develop our products, we must share trade secrets with them. We seek to protect our proprietary technology in part by entering into confidentiality agreements and, if applicable, material transfer agreements, collaborative research agreements, consulting agreements or other similar agreements with our collaborators, advisors, employees and consultants prior to beginning research or disclosing proprietary information. These agreements typically restrict the ability of our collaborators, advisors, employees and consultants to publish data potentially relating to our trade secrets. Our academic collaborators typically have rights to publish data, provided that we are notified in advance and may delay publication for a specified time in order to secure our intellectual property rights arising from the collaboration. In other cases, publication rights are controlled exclusively by us, although in some cases we may share these rights with other parties. We also conduct joint research and development programs which may require us to share trade secrets under the terms of research and development collaboration or similar agreements. Despite our efforts to protect our trade secrets, our competitors may discover our trade secrets, either through breach of these agreements, independent development or publication of information including our trade secrets in cases where we do not have proprietary or otherwise protected rights at the time of publication. A competitor’s discovery of our trade secrets would impair our competitive position and could have a material adverse effect on our business and financial condition.

Risks Related to Our Common Shares and/or our Series II First Preferred Shares

Our common share price has been volatile in recent years, and may continue to be volatile.

The market prices for securities of biopharmaceutical companies, including ours, have historically been volatile. In the year ended December 31, 2013, our common shares traded on the TSX Venture Exchange, or TSXV, at a high of $0.600 and a low of $0.140 per share. In the year ended December 31, 2014, on the TSXV/TSX our common shares traded at a high of $22.20 and a low of $6.30 per share. A number of factors could influence the volatility in the trading price of our common shares, including changes in the economy or in the financial markets, industry related developments, the results of product development and commercialization, changes in government regulations, and developments concerning proprietary rights, litigation and cash flow. Our quarterly losses may vary because of the timing of costs for manufacturing and initiating and completing preclinical and clinical trials. Also, the reporting of adverse safety events involving our products and public rumors about such events could cause our share price to decline or experience periods of volatility. Each of these factors could lead to increased volatility in the market price of our common shares. In addition, changes in the market prices of the securities of our competitors may also lead to fluctuations in the trading price of our common shares.

The value of our Series II First Preferred Shares is directly tied to the value of our common shares, and any change in the value of our common shares will be reflected in the value of our Series II First Preferred Shares.

There is no established public trading market for our Series II First Preferred Shares, and we do not expect a market to develop. In addition, we do not intend to apply for listing of our Series II First Preferred Shares on any national securities exchange or other nationally recognized trading system. As a result, because each offered Series II First Preferred Shares will be convertible into one common share, subject to adjustment and to certain limitations, we expect the value of our Series II First Preferred Shares to have a value directly tied to the value of our common shares. Accordingly, any change in the trading price of our common shares will be reflected in the value of our Series II First Preferred Shares, and the price of our common shares may be volatile, as described above.

We have never paid dividends and do not expect to do so in the foreseeable future.

We have not declared or paid any cash dividends on our common or preferred shares to date. The payment of dividends in the future will be dependent on our earnings and financial condition in addition to such other factors as our board of directors considers appropriate. Unless and until we pay dividends, shareholders may not receive a return on their shares. There is no present intention by our board of directors to pay dividends on our shares.

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Future sales or issuances of equity securities and the conversion of outstanding securities to common shares could decrease the value of the common shares, dilute investors’ voting power and reduce our earnings per share.

We may sell additional equity securities in future offerings, including through the sale of securities convertible into equity securities, to finance operations, acquisitions or projects, and issue additional common shares if outstanding warrants or stock options are exercised, or preferred shares are converted to common shares, including the Series II First Preferred Shares offered by us in this offering, which may result in dilution. See the information in the section of this prospectus entitled “Description of Share Capital” for details of our outstanding securities convertible into common shares. We filed a base shelf prospectus with securities commissions in Canada on May 26, 2014 that provides that we may sell under the prospectus from time to time over the following 25 months up to $50 million, in one or more offerings, of common shares, preferred shares, warrants to purchase common shares, or units comprising a combination of common shares, preferred shares and/or warrants. Subject to receipt of any required regulatory approvals, subscribers of the December 2013 private placement who purchased a minimum of 10% of the securities sold under the offering received rights to purchase our securities in future financings to enable each such shareholder to maintain their percentage holding in our common shares for so long as the subscriber holds at least 10% of the outstanding common shares on a fully-diluted basis. Shareholders who do not have this future financing participation right may be disadvantaged in participating in such financings.

Our board of directors has the authority to authorize certain offers and sales of additional securities without the vote of, or prior notice to, shareholders. Based on the need for additional capital to fund expected expenditures and growth, it is likely that we will issue additional securities to provide such capital. Such additional issuances may involve the issuance of a significant number of common shares at prices less than the current market price for our common shares.

Sales of substantial amounts of our securities, or the availability of such securities for sale, as well as the issuance of substantial amounts of our common shares upon conversion of outstanding convertible equity securities, including the Series II First Preferred Shares offered by us in this offering, could adversely affect the prevailing market prices for our securities and dilute investors’ earnings per share. A decline in the market prices of our securities could impair our ability to raise additional capital through the sale of securities should we desire to do so.

We are likely a “passive foreign investment company”, which may have adverse U.S. federal income tax consequences for U.S. shareholders .

U.S. investors should be aware that we believe we were classified as a passive foreign investment company, or PFIC, during the tax year ended December 31, 2014, and based on current business plans and financial expectations, we expect that we will be a PFIC for the current tax year and may be a PFIC in future tax years. If we are a PFIC for any year during a U.S. shareholder’s holding period of our offered shares, then such U.S. shareholder generally will be required to treat any gain realized upon a disposition of our offered shares, or any so-called “excess distribution” received on our offered shares, as ordinary income, and to pay an interest charge on a portion of such gain or distributions, unless the shareholder makes a timely and effective “qualified electing fund” election, or QEF Election, or a “mark-to-market” election with respect to our shares. A U.S. shareholder who makes a QEF Election generally must report on a current basis its share of our net capital gain and ordinary earnings for any year in which we are a PFIC, whether or not we distribute any amounts to our shareholders. A U.S. shareholder who makes the mark-to-market election generally must include as ordinary income each year the excess of the fair market value of the offered shares over the shareholder’s adjusted tax basis therein. This paragraph is qualified in its entirety by the discussion in the section of this prospectus entitled “Certain U.S. Federal Income Tax Considerations”. Each U.S. shareholder should consult its own tax advisors regarding the PFIC rules and the U.S. federal income tax consequences of the acquisition, ownership and disposition of our offered shares.

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Risks Related to the Offering

Because the public offering price is substantially higher than the pro forma net tangible book value per share, you will experience immediate and substantial dilution.

The public offering price will be substantially higher than the pro forma net tangible book value per share of our common shares immediately following this offering. Therefore, if you purchase our common shares in this offering, you will experience immediate and substantial dilution of approximately US$         per share (or approximately $         per share) in the price you pay for our common shares as compared to its pro forma net tangible book value, assuming full conversion of our Series II First Preferred Shares sold in this offering. If you purchase our Series II First Preferred Shares in this offering, and assuming that you convert your Series II First Preferred Shares into common shares, you will experience the same dilution per common share. To the extent outstanding options, DSUs and warrants to purchase common shares are exercised, there will be further dilution. For further information on this calculation, see the section of this prospectus entitled “Dilution”.

It may be difficult for non-Canadian investors to obtain and enforce judgments against us because of our Canadian incorporation and presence.

We are a corporation existing under the laws of the Province of Ontario, Canada. Several of our directors and officers, and several of the experts named in this prospectus, are residents of Canada, and all or a substantial portion of their assets, and a substantial portion of our assets, are located outside the United States. Consequently, although we have appointed an agent for service of process in the United States, it may be difficult for holders of our securities who reside in the United States to effect service within the United States upon those directors and officers, and the experts who are not residents of the United States. It may also be difficult for holders of our securities who reside in the United States to realize in the United States upon judgments of courts of the United States predicated upon our civil liability and the civil liability of our directors, officers and experts under the United States federal securities laws. Investors should not assume that Canadian courts (i) would enforce judgments of United States courts obtained in actions against us or such directors, officers or experts predicated upon the civil liability provisions of the United States federal securities laws or the securities or “blue sky” laws of any state or jurisdiction of the United States or (ii) would enforce, in original actions, liabilities against us or such directors, officers or experts predicated upon the United States federal securities laws or any securities or “blue sky” laws of any state or jurisdiction of the United States. In addition, the protections afforded by Canadian securities laws may not be available to investors in the United States.

If there are substantial sales of our common shares, the market price of our common shares could decline.

Sales of substantial numbers of our common shares could cause a decline in the market price of our common shares. Any sales by existing shareholders or holders who exercise their warrants or stock options may have an adverse effect on our ability to raise capital and may adversely affect the market price of our common shares.

We have broad discretion in how we use the net proceeds of the offering, and we may not use these proceeds in a manner desired by our security holders.

We will have broad discretion with respect to the use of the net proceeds from the offering and investors will be relying on the judgment of our management regarding the application of these proceeds. We could spend most of the net proceeds from the offering in ways that our shareholders may not desire or that do not yield a favorable return. You will not have the opportunity, as part of your investment in our securities, to influence the manner in which the net proceeds of the offering are used. We currently intend to use the proceeds of the offering as described in the section of this prospectus entitled “Use of Proceeds”. However, our needs may change as our business and our industry evolve. As a result, the proceeds we receive in the offering may be used in a manner significantly different from our current expectations.

We are an “emerging growth company,” and we cannot be certain if the reduced reporting requirements applicable to emerging growth companies will make our common shares less attractive to investors.

We are an “emerging growth company,” as defined in the JOBS Act. For as long as we continue to be an emerging growth company, we may take advantage of exemptions from various reporting requirements that are

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applicable to other public companies that are not emerging growth companies, including not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in our periodic reports and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved. We could be an emerging growth company for up to five years, although circumstances could cause us to lose that status earlier. We cannot predict if investors will find our common shares less attractive because we may rely on these exemptions. If some investors find our common shares less attractive as a result, there may be a less active trading market for our common shares and our share price may be more volatile.

Any failure to maintain an effective system of internal controls may result in material misstatements of our consolidated financial statements or cause us to fail to meet our reporting obligations or fail to prevent fraud; and in that case, our shareholders could lose confidence in our financial reporting, which would harm our business and could negatively impact the price of our common shares.

Effective internal controls are necessary for us to provide reliable financial reports and prevent fraud. If we fail to maintain an effective system of internal controls, we might not be able to report our financial results accurately or prevent fraud; and in that case, our shareholders could lose confidence in our financial reporting, which would harm our business and could negatively impact the price of our common shares. While we believe that we have sufficient personnel and review procedures to allow us maintain an effective system of internal controls, we cannot assure you that we will not experience potential material weaknesses in our internal control. Even if we conclude that our internal control over financial reporting provides reasonable assurance regarding the reliability of financial reporting and the preparation of consolidated financial statements for external purposes in accordance with International Financial Reporting Standards, as issued by the International Accounting Standards Board, because of its inherent limitations, internal control over financial reporting may not prevent or detect fraud or misstatements. Failure to implement required new or improved controls, or difficulties encountered in their implementation, could harm our results of operations or cause us to fail to meet our future reporting obligations.

If we fail to timely achieve and maintain the adequacy of our internal control over financial reporting, we may not be able to produce reliable financial reports or help prevent fraud. Our failure to achieve and maintain effective internal control over financial reporting could prevent us from complying with our reporting obligations on a timely basis, which could result in the loss of investor confidence in the reliability of our consolidated financial statements, harm our business and negatively impact the trading price of our common shares.

As a foreign private issuer, we are not subject to certain United States securities law disclosure requirements that apply to a domestic United States issuer, which may limit the information which would be publicly available to our shareholders.

As a foreign private issuer, we are not required to comply with all the periodic disclosure requirements of the Exchange Act, and therefore, there may be less publicly available information about us than if we were a United States domestic issuer. For example, we are not subject to the proxy rules in the United States and disclosure with respect to our annual meetings will be governed by Canadian requirements.

Our charter documents and certain Canadian legislation could delay or deter a change of control, limit attempts by our shareholders to replace or remove our current management and limit the market price of our common shares.

Our authorized preferred shares are available for issuance from time to time at the discretion of our board of directors, without shareholder approval. Our articles grant our board of directors the authority to determine the special rights and restrictions granted to or imposed on any unissued series of preferred shares, and those rights may be superior to those of our common shares. Further, the Investment Canada Act subjects any acquisition of control of a company by a non-Canadian to government review if the value of the assets as calculated pursuant to the legislation exceeds a threshold amount or in other circumstances determined at the discretion of the Canadian government. A reviewable acquisition may not proceed unless the relevant minister is satisfied that the investment is likely to be of net benefit to Canada and the Canadian government is satisfied that no other important concerns arise from the acquisition of control. Any of the foregoing could prevent or delay a change of control and may deprive or limit strategic opportunities to our shareholders to sell their shares.

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