Diuretics, or 'water pills', make skin cancer seven times more likely, especially in patients who have been taking the drugs for a long time.

The drugs contain a chemical called hydrochlorothiazide, which seems to change the skin, and makes it more sensitive to the sun's UV rays, say researchers at the University of Southern Denmark.

Androgen-targeted therapy (ATT) is routinely used on the most common type of prostate cancer, adenocarcinoma, in its early stage. It targets androgens, the male sex hormones that can stimulate tumor growth—but sometimes the hormones become resistant to ATT and are transformed into a more dangerous type, neuroendocrine cancer cells.