To investigate whether the reduced PR protein in KRAS-mutated adenomyosis samples was due to an effect of mutant KRAS on PR mRNA expression, we applied qPCR analysis to our immortalized endometrial cells overexpressing KRAS-Mut, KRAS-WT, PIK3CA-WT, or PIK3CA-Mut (please see the Source Data file). Here, PIK3CA is linked to adenomyosis.