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424B5
PROTAGONIST THERAPEUTICS, INC filed this Form 424B5 on 08/07/2018
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plan other global regulatory submissions to support the initiation of a global Phase 2 study of PTG-300 in patients with beta-thalassemia in the fourth quarter of 2018.

        In addition, we continue to use our peptide technology platform to discover product candidates against targets in disease areas with significant unmet medical needs. In 2018, we anticipate initiating IND-enabling studies for a fourth product candidate, an oral peptide targeting a GI condition other than IBD.

        We have not generated any revenue from product sales and we do not currently have any products approved for commercialization. We have never been profitable and have incurred net losses in each year since inception and we do not anticipate that we will achieve sustained profitability in the near term. Our net loss was $37.0 million, $37.2 million and $14.8 million for the years ended December 31, 2017, 2016 and 2015, respectively. As of December 31, 2017, we had an accumulated deficit of $101.6 million. Substantially all of our net losses have resulted from costs incurred in connection with our research and development programs and from general and administrative costs associated with our operations. We expect to continue to incur significant research, development and other expenses related to our ongoing operations and product development, including clinical development activities under the Janssen License and Collaboration Agreement, and as a result, we expect to continue to incur losses in the future as we continue our development of, and seek regulatory approval for, our product candidates.

Janssen License and Collaboration Agreement

        On May 26, 2017, we and Janssen entered into an exclusive license and collaboration agreement (the "Janssen License and Collaboration Agreement") for the development, manufacture and commercialization of PTG-200 worldwide for the treatment of CD and UC. Janssen is a related party to us as Johnson & Johnson Innovation—JJDC, Inc., a significant shareholder of ours, and Janssen are both subsidiaries of Johnson and Johnson. The Janssen License and Collaboration Agreement became effective on July 13, 2017. Upon the effectiveness of the agreement, we became eligible for and received a non-refundable, upfront cash payment of $50.0 million from Janssen.

        Under the Janssen License and Collaboration Agreement, we granted to Janssen an exclusive worldwide license to develop, manufacture and commercialize PTG-200 and related IL-23R compounds for all indications, including CD and UC. We are responsible, at our own expense, for the conduct of the Phase 1 clinical trial for PTG-200 and Janssen will be responsible for the conduct of a potential Phase 2 clinical trial for PTG-200 in CD, including filing the Phase 2 IND. All such clinical trials will be conducted in accordance with a mutually agreed upon clinical development plan and budget. Development costs for the Phase 2 clinical trial will be shared between the parties on an 80%/20% basis, with Janssen assuming the larger share. Should Janssen elect to retain its license following completion of the Phase 2 clinical trial, it will be responsible, at its own expense, for the manufacture, continued development of, seeking regulatory approval for, and commercialization of PTG-200 worldwide. The parties' development activities under the Janssen License and Collaboration Agreement through the Phase 2 clinical trial will be overseen by a joint governance structure which will have equal representation by both parties unless both parties mutually agree to disband such structure or we have provided written notice to Janssen of our intention to disband and no longer participate in such structure.

        We are eligible to receive a $25.0 million payment upon filing of the Phase 2 IND. Following the conclusion of the planned Phase 2a portion of the Phase 2 clinical trial, if Janssen elects to maintain its license rights and continue the development of PTG-200 in the Phase 2b portion of such clinical trial (the "First Opt-in Election"), we would be eligible to receive a $125.0 million payment. Following the conclusion of the planned Phase 2b portion of the Phase 2 clinical trial, if Janssen elects again to maintain its license rights (the "Second Opt-in Election"), we would be eligible to receive a

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