Quantitative RT-PCR (RT-qPCR) showed that TRPV1, TRPV2, TRPV4, TRPV6, TRPM4, TRPM6, TRPM7, TRPC1, TRPC3, TRPC4, and TRPC6 were expressed well above the detection limit (Cq < 30) throughout the menstrual cycle in whole endometrial biopsies of endometriosis patients. This evidence concerns the gene TRPC4 and endometriosis.