RET and cancer: Younger cancer patients express certain gene fusions at a higher frequency than older patients, including ALK or RET fusions in lung adenocarcinomas10,11, RET/PTC1 and RET/PTC3 fusions in papillary thyroid cancer12, EWSR1/FUS-ATF1 fusions in mesothelioma13, and DUX4 fusions in B cell acute lymphoblastic leukemia14.