In the TCGA datasets, ALK5 was mutated in 2.7% (13 of 351) of non-ultramutated endometrioid ECs, 0.9% (1 of 107) of serous ECs, and 0% (0 of 56) uterine carcinosarcomas. Here, TGFBR1 is linked to uterine carcinosarcoma.