With an arbitrary threshold of 1.2 for the ratio of mRNA levels in pairs of EC and adjacent control tissue we saw increased ratios in 8 out of 22 pairs for CYP19A1, 10 out of 27 pairs for STS and 9 out of 27 pairs for HSD17B1. We also investigated the mRNA levels of the oxidative HSD17B14, which has not yet been studied in EC and found high, but statistically significantly decreased levels (p < 0.0001) in cancer tissue, compared to control tissue. The gene discussed is HSD17B1; the disease is cancer.