Safety and enhanced immunostimulatory activity of the DRD2 antagonist ONC201 in advanced solid tumor patients with weekly oral administration
Mark N Stein, Jyoti Malhotra, Rohinton S Tarapore, Usha Malhotra, Ann W Silk, Nancy Chan, Lorna Rodriguez, Joseph Aisner, Robert D Aiken, Tina Mayer, Bruce G Haffty, Jenna H Newman, Salvatore M Aspromonte, Praveen K Bommareddy, Ricardo Estupinian, Charles B Chesson, Evita T Sadimin, Shengguo Li, Daniel J Medina, Tracie Saunders, Melissa Frankel, Aparna Kareddula, Sherrie Damare, Elayne Wesolowsky, Christian Gabel, Wafik S El-Deiry, Varun V Prabhu, Joshua E Allen, Martin Stogniew, Wolfgang Oster, Joseph R Bertino, Steven K Libutti, Janice M Mehnert, Andrew Zloza, Mark N Stein, Jyoti Malhotra, Rohinton S Tarapore, Usha Malhotra, Ann W Silk, Nancy Chan, Lorna Rodriguez, Joseph Aisner, Robert D Aiken, Tina Mayer, Bruce G Haffty, Jenna H Newman, Salvatore M Aspromonte, Praveen K Bommareddy, Ricardo Estupinian, Charles B Chesson, Evita T Sadimin, Shengguo Li, Daniel J Medina, Tracie Saunders, Melissa Frankel, Aparna Kareddula, Sherrie Damare, Elayne Wesolowsky, Christian Gabel, Wafik S El-Deiry, Varun V Prabhu, Joshua E Allen, Martin Stogniew, Wolfgang Oster, Joseph R Bertino, Steven K Libutti, Janice M Mehnert, Andrew Zloza
Abstract
Background: ONC201 is a small molecule antagonist of DRD2, a G protein-coupled receptor overexpressed in several malignancies, that has prolonged antitumor efficacy and immunomodulatory properties in preclinical models. The first-in-human trial of ONC201 previously established a recommended phase II dose (RP2D) of 625 mg once every three weeks. Here, we report the results of a phase I study that evaluated the safety, pharmacokinetics (PK), and pharmacodynamics (PD) of weekly ONC201.
Methods: Patients ≥ 18 years old with an advanced solid tumor refractory to standard treatment were enrolled. Dose escalation proceeded with a 3 + 3 design from 375 mg to 625 mg of ONC201. One cycle, also the dose-limiting toxicity (DLT) window, was 21 days. The primary endpoint was to determine the RP2D of weekly ONC201, which was confirmed in an 11-patient dose expansion cohort.
Results: Twenty patients were enrolled: three at 375 mg and 17 at 625 mg of ONC201. The RP2D was defined as 625 mg with no DLT, treatment discontinuation, or dose modifications due to drug-related toxicity. PK profiles were consistent with every-three-week dosing and similar between the first and fourth dose. Serum prolactin and caspase-cleaved cytokeratin-18 induction were detected, along with intratumoral integrated stress response activation and infiltration of granzyme B+ Natural Killer cells. Induction of immune cytokines and effectors was higher in patients who received ONC201 once weekly versus once every three weeks. Stable disease of > 6 months was observed in several prostate and endometrial cancer patients.
Conclusions: Weekly, oral ONC201 is well-tolerated and results in enhanced immunostimulatory activity that warrants further investigation.
Trial registration: NCT02250781 (Oral ONC201 in Treating Patients With Advanced Solid Tumors), NCT02324621 (Continuation of Oral ONC201 in Treating Patients With Advanced Solid Tumors).
Keywords: Cancer; Dopamine; Immuno-oncology; Immunotherapy; ONC201; Solid tumors.
Conflict of interest statement
Rohinton S. Tarapore, Varun V. Prabhu, Joshua E. Allen, Martin Stogniew, and Wolfgang Oster are employees and shareholders of Oncoceutics. Joseph Bertino is a shareholder of Oncoceutics. Wafik S. El-Deiry is the Scientific Founder of Oncoceutics and a shareholder and is compliant with institutional and NIH guidelines for disclosure of conflict of interest.
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Source: PubMed