A Phase I Study to Assess PSMA+ and PSMA- Tumour Lesions

Phase 1, Open-label, single centre, non-randomised study during which, enrolled patients will undergo a number of PET scans following administration of 89Zr-CB307, in order to assess the uptake of the radiolabelled drug. A post-treatment tumour biopsy for the assessment of PSMA expression will also be taken, if medically feasible, after the last PET scan. The sub-study consists of 2 parts: an Optimisation Phase (Part A) and an Expansion Phase (Part B). In Part A, both 89Zr-CB307 and CB307 will be administered to patients. The timing of the scans, post-dose tumour biopsy and CB307 dose will be optimised as determined by the Optimisation Review Committee (ORC). In Part B (Expansion Phase), 89Zr-CB307 PET scanning will be performed based on the optimal dosing and timing determined in Part A. The sub-study will continue for 7 days after the tracer injection. Patients will then be enrolled into the main study and will receive Cycle 1 Day 1 (C1D1) CB307 treatment according to the main study protocol.