PSMC4 and cancer: Several genes (B2M, EIF2B1, ELF1 and PSMC4; type 1 EC, and YWAZ, UBC, and PGK1; type 2 EC) were not identified in the combinations of five best genes for the two cancer sub-types (this study) suggesting that the transcriptome of these two EC sub-types may in fact be very different.