Evaluation of ETC-1907206 With Dasatinib in Advanced Haematologic Malignancies

This study consists of two parts: a Phase 1A dose escalation to identify the MTD and the RD of ETC-1907206 administered in combination with dasatinib and a Phase 1B expansion at the RD. Phase 1A: A dose escalation with an adaptive design model using ordinal continual reassessment method (oCRM) will be used to characterise the dose toxicity curve of ETC-1907206 when administered orally every other day (EOD) under fasted conditions in combination with oral once daily dasatinib (per locally approved product prescribing instructions) in order to identify the maximum tolerated dose (MTD) and recommended dose (RD) for Phase 1B. Phase 1B: Open-label, non-randomised, to assess preliminary clinical activity and safety of ETC-1907206 administered orally EOD under fasted conditions at the RD identified in Phase 1A, in combination with dasatinib (per locally approved product prescribing instructions). Patients will continue in the study until disease progression, the start of new anti-cancer therapy, unacceptable toxicity, death, or the completion of 12 separate 4-week treatment cycles, whichever occurs first. As long as the Sponsor agrees to continue treatment, patients who complete 12 cycles of treatment and have no evidence of disease progression are allowed to continue on treatment past the end of treatment (EOT) visit until there is disease progression, unacceptable toxicity, the patient decides to withdraw, or it is judged not to be in the patient's interest to continue on the study. Malignancy assessments of the underlying disease at enrolment (blood and bone marrow), Eastern Cooperative Oncology Group (ECOG) performance status, pharmacokinetic (PK) sampling for ETC-1907206 and dasatinib, sample collection for ETC-1907206 and dasatinib biomarker analysis, and safety and tolerability assessments will be performed during the study.