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Mr. Courtney Lindsay
Ms. Suzanne Hayes
Securities and Exchange Commission
October 5, 2020
Page 3
Response to Comment No. 1, part (c):
As discussed in previous response letters and the Registration Statement, the Company believes that its engEx Platform is well-suited for the development of exosome-based vaccines that can be purposely designed to activate specific arms of the immune system, which capability the Company refers to as exoVACC. The Company’s exoVACC development programs involve a material portion of the Company’s human and financial resources. As such, inclusion of exoVACC on the Pipeline Chart is material to an investor’s understanding of the Company’s business. Moreover, as noted above, the Company has reduced the length of the bars for its exoVACC programs to more clearly indicate that they are in the discovery stage of development.
With respect to the exoVACC programs that the Company is developing in collaboration with Ragon, the Company is working to incorporate as antigens certain HIV epitopes identified by Ragon and T cell epitopes identified by Ragon into exoVACC candidates for potential treatment of HIV and SARS-CoV2, respectively. With respect to the Company’s exoVACC program that the Company is developing in collaboration with Washington University of St. Louis, as discussed on page 172 of the Registration Statement, the Company is working to incorporate proprietary tumor neoantigens identified by Dr. Schreiber to evaluate in potential exoVACC candidates. As discussed on page 172 of the Registration Statement, the Company plans to screen these early stage, preclinical candidates in vitro with patient blood samples and then test them in appropriate preclinical models prior to any human testing.
Beyond the validation that collaborating with Ragon and Washington University of St. Louis provides the Company and its engEx Platform, the Company believes that the antigens and expertise made available through the collaborations have enabled the Company to develop exoVACC candidates that have promising therapeutic potential. However, as with all early stage development programs, it is possible that the antigens provided by these research institutions may not yield viable exoVACC candidates that merit further investigation in preclinical and/or clinical testing. In addition, as described in the Registration Statement, the Company’s agreements with Ragon and Washington University of St. Louis, are one year agreements and include only an option to acquire a license to intellectual property related to the antigens being evaluated. If the Company is unable to reach commercially reasonable terms on the ultimate license of the antigens from Ragon and/or Washington University of St. Louis or the Company’s development efforts are unsuccessful, it will not move forward with one or both of such collaborations. In that event, the Company plans to develop its own antigens or, as discussed on page 172 of the Registration Statement, pursue additional collaborations to acquire rights to other unique and valuable antigens, so that it can continue to develop exoVACC candidates targeting cancer and viral diseases, such as HIV and SARS-CoV2.