Prostate cancer. Coloured freeze-fracture scanning electron micrograph (SEM) of prostate cancer. The spherical glandular acini are lined with carcinoma cancer cells. Prostate cancer is one of the most common male cancers, usually affecting the elderly. The uncontrolled growth of the cancer obstructs the neck of the bladder, impairing urination. Treatment involves surgery to remove the prostate gland or radiotherapy. Magnification: x200 when printed 10 centimetres wide.