Male urogenital cancers, illustration. The two kidneys are at upper left and right. The kidneys filter waste products from the blood. The waste products are transported as urine to the bladder (lower centre) via the ureters (tubes). Urine is stored in the bladder until it exits the body via the urethra (bottom centre). Just below the bladder is the prostate gland, which secretes a fluid that forms part of the semen. There are tumours in the right ureter (at left), bladder lining and prostate. The tumour (white) in the prostate has spread into the bladder wall.