GREB1 and endometriosis: GREB1 promoted oestrogen‐stimulated proliferation of breast cancer,19 prostate cancer20and endometriosis.21 Oestrogen could induce the transcription of the corresponding enhancers of GREB1, giving rise to GREB1 eRNA (eGREB1) production in MCF‐7.12, 16 In view of the continuous existence of gender differences in BCa, oestrogen seems to be especially important in BCa progression.