PGR and gastric cancer: Altered estrogen and / or progesterone receptor expression has been documented for example in thyroid cancer [12–15], Hodgkin’s lymphoma [16–18], B-cell malignancies [19, 20], brain tumours [21–25], prolactinoma [26, 27], melanoma [28–31], lung cancer [32, 33], colorectal cancer [34–36], gastric cancer [37] and liver cancer [38, 39].