MCL1 and cancer: Morgan and co‐workers then demonstrated that UMI‐77 radio‐sensitised cancer cell lines BxPC‐3 and Panc‐1, but did not radio‐sensitise normal small intestinal cells.77 Morgan demonstrated that ABT‐737, which does not bind to Mcl‐1, did not perform in the same manner, suggesting Mcl‐1 plays a key role in radio‐sensitising cancer cells.