Abstract
Progesterone, a female sex hormone not only has a role in reproduction, but also in protecting females in melanoma. A survey of steroid hormones actions steroid hormones actions survey on melanoma cells and literature survey showed that progesterone inhibited mouse and human melanoma cell growth significantly in-vitro. Progesterone not only inhibited cell growth, but also affected adhesion and migration functions (essential for metastasis) in-vitro. This observation correlated with the clinical studies where they had shown showed an increased survival and delayed metastasis in menstruating females in melanoma. Further, progesterone level in menstruating females (1000–1500 ng/dL) compared to post-menopausal females (20–100 ng/dL) also correlated with previous clinical studies. Progesterone action on melanoma cells, as reported by other researchers also supported the findings from this lab. Hence, progesterone could be the steroid hormone protecting menstruating females in melanoma. Moreover, our recent studies showed that progesterone suppressed pro-inflammatory cytokine IL-8 secretion by the melanoma cells, which decreased melanoma cell growth in-vitro. Hence, progesterone apart from reproductive function may also be involved in protecting menstruating females in melanoma.