TP53 and carcinoma: The differentiated carcinoma components of the 42 SWI/SNF‐deficient DDEC were as follows: 32 were grade 1 endometrioid, 6 were grade 2 endometrioid, 3 were grade 3 endometrioid and 1 was serous (abnormal p53 null mutation‐type pattern in both serous and undifferentiated components).