Prostate cancer. Immunofluorescent light micrograph of prostate cancer cells. The large cell nuclei, which contain DNA (deoxyribonucleic acid, blue), are typical of the rapid cell division that occurs in cancer. Proteins in the cytoplasm are green and orange. Prostate cancer is one of the most common male cancers, mainly occurring in the elderly. Treatment involves the removal of the prostate gland or radiotherapy. Immunofluorescence uses antibodies to attach fluorescent dyes to specific tissues and molecules within the cell. Magnification unknown.