A Dose-Escalation Study of Onc201 Administered Every One or Three Weeks in Advanced Solid Tumors and Multiple Myeloma

This phase 1 study will determine the maximum tolerated dose (MTD) and/or recommended phase II dose (RP2D) of ONC201, when given as a single agent, to patients with advanced solid tumors or multiple myeloma, in two dose schedules including every 3 weeks and weekly. For the first arm (A), dose escalation will use the following single patient dose-escalation cohorts based on 'Design 4' proposed by Simon and colleagues: 125, 250, 500, and 625 mg. Following completion of Arm A dose escalation, subsequent cohorts will be tested in a minimum of 3 patients. The Arm B dose cohort will consist of dose levels administered once every one week (planned dosing of 250, 375, 500 and 625 mg). Dependent on PK and PD data, or emerging efficacy data, additional dose levels in Arm A or Arm B may be explored. For Arm A, single patient cohorts will be used until the first instance of DLT or the second instance of grade 2 toxicity. Either occurrence will lead to immediate use of a modified 3+3 design and \~40% dose increments. Arm B will use a 3 + 3 design for all cohorts. It is anticipated that 16 - 48 evaluable patients in the dose escalation and an additional 17 patients in the expansion phase will be enrolled into this study over the course of 2 years. Patients will receive ONC201 in 3-week cycles until disease progression, unacceptable toxicity, or the patient discontinues for any other reason. The maximum duration of treatment will be 12 months unless it is determined that a patient would derive benefit from continued therapy beyond 12 months.