Before obtaining regulatory approval for the sale of any drug or biologic candidate, we must conduct extensive preclinical tests and successful clinical trials to demonstrate the safety and efficacy of our product candidates in humans. Before human clinical trials may commence, we must submit to the FDA an IND. An IND involves the completion of preclinical studies and the submission of the results, together with proposed clinical protocols, manufacturing information, analytical data and other data in the IND submission. The FDA may require us to complete additional preclinical studies or disagree with our clinical trial study design. Also, animal models may not exist for some of the disease areas we choose to develop our product candidates for. As a result, our clinical trials may be delayed or we may be required to incur more expense than we anticipated.
Clinical trials require the review and oversight of IRBs, which approve and continually review clinical investigations and protect the rights and welfare of patients. Before our clinical trials can begin, we must also submit to the FDA a clinical protocol accompanied by the approval of the IRB at the institution(s) participating in the clinical trial. An inability or delay in obtaining IRB approval could prevent or delay the initiation and completion of our clinical trials, and the FDA may decide not to consider any data or information derived from a clinical investigation not subject to initial and continuing IRB review and approval.
Preclinical studies and clinical trials are lengthy and expensive, and their outcome is highly uncertain. Historical failure rates are high due to a number of factors, such as safety and efficacy of drug or biologic candidates. We, our collaborators, the FDA, or an IRB may suspend clinical trials of a drug or biologic candidate at any time for various reasons, including if we or they believe the patients participating in such trials are being exposed to unacceptable health risks. Among other reasons, adverse side effects of a drug or biologic candidate on patients in a clinical trial could result in the FDA suspending or terminating the clinical trial and refusing to approve a particular drug or biologic candidate for any or all indications of use.
An additional number of factors could affect the timing, cost or outcome of our drug development efforts, including the following:
- Delays in filing or acceptance of INDs, NDAs, or BLA for our product candidates; - Difficulty in securing centers to conduct clinical trials; - Conditions imposed on us by the FDA regarding the scope or design of our clinical trials; - Problems in engaging IRBs to oversee trials or problems in obtaining or maintaining IRB approval of studies; - Difficulty in enrolling patients in conformity with required protocols or projected timelines; - Third-party contractors failing to comply with regulatory requirements or to meet their contractual obligations to us in a timely manner; - Our drug or biologic candidates having unexpected and different chemical and pharmacological properties in humans than in laboratory testing and interacting with human biological systems in unforeseen, ineffective or harmful ways; - The need to suspend or terminate clinical trials, for example, if the participants are being exposed to unacceptable health risks; - Insufficient or inadequate supply or quality of our product candidates or other necessary materials necessary to conduct our clinical trials; - Effects of our product candidates not having the desired effects or including undesirable side effects or the product candidates having other unexpected characteristics; - The cost of our clinical trials being greater than we anticipate; - Negative or inconclusive results from our clinical trials or the clinical trials of others for similar product candidates or inability to generate statistically significant data confirming the efficacy of the product being tested; - Changes in the FDA's requirements or expectations for testing during the course of that testing; - Reallocation of our limited financial and other resources to other clinical programs; and - Adverse results obtained by other companies developing similar drugs.
A failure of any preclinical study or clinical trial can occur at any stage of testing. Any delay or failure in obtaining required approvals may prevent us from completing our preclinical studies or clinical trials and could have a material adverse effect on our ability to initiate or commercialize any drug or biologic candidate on a timely basis, or at all. Additionally, preclinical studies and clinical trials are lengthy and expensive and if our cash resources become limited we may not be able to commence, continue or complete our clinical trials, which could have a material impact on our business, financial condition, and results of operations.