- Cohort Expansion: Able and willing to give valid written consent to undergo a new tumour biopsy (prior to study treatment). Able and willing to undergo a second tumour biopsy on treatment. Where possible, tumour lesions used for new biopsies should not be the same lesions used as RECIST target lesions, unless there are no other lesions suitable for biopsy. Archival samples may be required if there is inadequate tissue in the biopsy specimen.