[Correspondence] It takes two to tango: importance of oestrogen receptor and progesterone receptor in endometrial cancer

We congratulate Nicole Concin and colleagues with the effort put into the updated ESGO–ESTRO–ESP guidelines.1 Although we support the integration of oestrogen receptor status in the guideline, we wonder why progesterone receptor expression is not included. In our opinion, oestrogen receptor and progesterone receptor have additional prognostic and predictive value in endometrial cancer, and these receptors are cheap and well established biomarkers available worldwide for breast and endometrial cancer diagnosis.