In another study, a comparison of five healthy control ovarian samples with three ovarian endometrioid adenocarcinoma samples demonstrated the least variation in levels of PPIA, RPL37A (Ribosomal protein L37a), and RPS17 (Ribosomal protein S17) among the investigated HKGs [85]. The gene discussed is RPS17; the disease is ovarian endometrioid adenocarcinoma.