AMES, Iowa, May 17, 2017 (GLOBE NEWSWIRE) -- NewLink Genetics Corporation (NASDAQ:NLNK) today announced that abstracts from two clinical studies of its IDO pathway inhibitors, indoximod and navoximod (GDC-0919), used in combination with other agents, are now available on the website of the 2017 American Society of Clinical Oncology (ASCO) Annual Meeting.

An infographic accompanying this announcement is available at

"The IDO pathway is a key immuno-oncology target and NewLink Genetics has two separate and distinct IDO pathway inhibitors in clinical development. Indoximod, which is wholly owned by NewLink Genetics, has a proposed differentiated mechanism within the IDO pathway and acts as a tryptophan mimetic having a direct effect on immune cells to reverse immune suppression used by cancer to protect itself. Navoximod is our direct enzymatic inhibitor of IDO and is partnered with Genentech/Roche," said Charles J. Link, Jr., M.D., Chief Executive Officer and Chief Scientific Officer of NewLink Genetics.

Indoximod in combination with the therapeutic cancer vaccine, PROVENGE ®

Results from a randomized, double-blind, placebo-controlled, multi-institutional Phase 2 investigator initiated study with indoximod in combination with the therapeutic cancer vaccine, PROVENGE ® (sipuleucel-T), for patients with metastatic castration resistant prostate cancer will be presented as a poster (Abstract number 3066) by Gautam Gopalji Jha, M.D., Adjunct Assistant Professor, Division of Hematology and Oncology, University of Minnesota, at ASCO in Chicago on Monday, June 5, 2017, 8:00 a.m. - 11:30 a.m. CT, titled, A phase 2 randomized, double-blind study of sipuleucel-T followed by IDO pathway inhibitor, indoximod or placebo in the treatment of patients with metastatic castration resistant prostate cancer (mCRPC).

In the study, forty-six patients were randomized into two arms to receive either twice daily oral indoximod (n=22) or placebo (n=24) for 6 months beginning the day after the third and final PROVENGE infusion. Conclusions indicate that treatment with the IDO pathway inhibitor, indoximod, post PROVENGE therapy, leads to significant improvement in radiographic progression free survival (rPFS) when compared to placebo and is well-tolerated.

Key findings presented from the study include:
  • Statistically significant improvement in median rPFS was 10.3 months in the treatment arm compared to 4.1 months in the placebo arm ( p = 0.011)
  • Median Overall Survival (OS) has not yet been reached
  • Patients tolerated therapy with indoximod with no significant differences in adverse events between the two arms
  • There was no statistical difference in the primary endpoint of ELISPOT assay immune response to PA2024, the PROVENGE-related fusion protein, in the 35 of 46 patients who had clinical samples available for testing

"These data further support the hypothesis that targeting the IDO Pathway in combination with a broad backbone of treatment regimens including chemotherapy, anti-PD-1 antibodies and therapeutic vaccines across multiple indications has the potential to provide meaningful clinical benefit without compromising tolerability," commented Nicholas N. Vahanian, M.D., President and Chief Medical Officer of NewLink Genetics.

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