Wednesday, January 11, 2023 IND234 substudy D: A Phase II Study of CFI-400945 Fumarate in Metastatic Castration-Resistant Prostate Cancer (mCRPC) - A Substudy of IND234 is closed to accrual however this substudy, treatment and follow up of patients will continue according to the protocol. Please note the IND234 main study and other substudies remain open to accrual. Objectives: Primary Objectives To determine the effect of CFI-400945 on PSA decline and time to PSA progression. To determine objective response as determined by RECIST 1.1 criteria. Tertiary Objectives To obtain cfDNA and non-malignant DNA from peripheral blood clinically annotated with patient disease characteristics and follow-up data to identify potential predictive and prognostic factors and relationship between cfDNA results with clinical presentation. To evaluate the safety and toxicity profile of CFI-400945 in mCRPC patients. For more information please visit the IND234 members trial page.