In vivo efficacy of SAR428926 was evaluated in PDX models engrafted subcutaneously into immunocompromised SCID mice….The PDX models used in the study, which include colon, breast, lung, prostate, gastric and ovarian cancer, were selected by IHC based on LAMP1 expression levels distribution and the frequency of LAMP1 membrane positive cells, which varied between 5% and 100% of the tumor cells...In addition to membrane LAMP1 expression, a key driver for efficacy was the intrinsic sensitivity of the PDX models to DM4.