uterine sarcoma (YOO-teh-rin sar-KOH-muh) A rare type of uterine cancer that forms in muscle or other tissues of the uterus (the small, hollow, pear-shaped organ in a woman's pelvis in which a fetus develops). It usually occurs after menopause. The two main types are leiomyosarcoma (cancer that begins in smooth muscle cells) and endometrial stromal sarcoma (cancer that begins in connective tissue cells).

Appendix Cancer

appendix A small, fingerlike pouch that sticks out from the cecum (the first part of the large intestine near the end of the small intestine).

Penile Cancer

penile cancer (PEE-nile KAN-ser) A rare cancer that forms in the penis (an external male reproductive organ). Most penile cancers are squamous cell carcinomas (cancer that begins in flat cells lining the penis).

Ovarian Epithelial Cancer

ovarian epithelial cancer (oh-VAYR-ee-un eh-pih-THEE-lee-ul KAN-ser) Cancer that occurs in the cells on the surface of the ovary. Also called epithelial ovarian cancer.

Oropharyngeal Cancer

oropharyngeal cancer (or-oh-fuh-RIN-jee-ul KAN-ser) Cancer that forms in tissues of the oropharynx (the part of the throat at the back of the mouth, including the soft palate, the base of the tongue, and the tonsils). Most oropharyngeal cancers are squamous cell carcinomas (cancer that begins in flat cells lining the oropharynx).

Testicular Cancer

testicular cancer (tes-TIH-kyuh-ler KAN-ser) Cancer that forms in tissues of the testis (one of two egg-shaped glands inside the scrotum that make sperm and male hormones). Testicular cancer usually occurs in young or middle-aged men. Two main types of testicular cancer are seminomas (cancers that grow slowly and are sensitive to radiation therapy) and nonseminomas (different cell types that grow more quickly than seminomas

Parathyroid Cancer

parathyroid cancer (PAYR-uh-THY-royd KAN-ser) A rare cancer that forms in tissues of one or more of the parathyroid glands (four pea-sized glands in the neck that make parathyroid hormone, which helps the body store and use calcium).

Pancreatic Cancer

pancreatic cancer (PAN-kree-A-tik KAN-ser) A disease in which malignant (cancer) cells are found in the tissues of the pancreas. Also called exocrine cancer.

Prostate Cancer

prostate cancer (PROS-tayt KAN-ser) Cancer that forms in tissues of the prostate (a gland in the male reproductive system found below the bladder and in front of the rectum). Prostate cancer usually occurs in older men.

Breast Cancer

Definition of breast cancer: Cancer that forms in tissues of the breast, usually the ducts (tubes that carry milk to the nipple) and lobules (glands that make milk). It occurs in both men and women, although male breast cancer is rare.

Breast Cancer, Childhood

breast cancer (brest KAN-ser) Cancer that forms in tissues of the breast, usually the ducts (tubes that carry milk to the nipple) and lobules (glands that make milk). It occurs in both men and women, although male breast cancer is rare. Enlarge

Breast Cancer and Pregnancy

Breast cancer is sometimes detected (found) in women who are pregnant or have just given birth. In women who are pregnant or who have just given birth, breast cancer occurs most often between the ages of 32 and 38. Breast cancer occurs about once in every 3,000 pregnancies.

Skin Cancer

skin cancer (skin KAN-ser) Cancer that forms in tissues of the skin. There are several types of skin cancer. Skin cancer that forms in melanocytes (skin cells that make pigment) is called melanoma. Skin cancer that forms in basal cells (small, round cells in the base of the outer layer of skin) is called basal cell carcinoma. Skin cancer that forms in squamous cells (flat cells that form the surface of the skin) is called squamous cell carcinoma. Skin cancer that forms in neuroendocrine cells (cells that release hormones in response to signals from the nervous system) is called neuroendocrine carcinoma of the skin. Most skin cancers form in older people on parts of the body exposed to the sun or in people who have weakened immune systems.

Urethral Cancer

urethral cancer (yoo-REE-thrul KAN-ser) A rare cancer that forms in tissues of the urethra (the tube through which urine empties the bladder and leaves the body). Types of urethral cancer include transitional cell carcinoma (cancer that begins in cells that can change shape and stretch without breaking apart), squamous cell carcinoma (cancer that begins in flat cells lining the urethra), and adenocarcinoma (cancer that begins in cells that make and release mucus and other fluids).

Ovarian Cancer

ovarian cancer (oh-VAYR-ee-un KAN-ser) Cancer that forms in tissues of the ovary (one of a pair of female reproductive glands in which the ova, or eggs, are formed). Most ovarian cancers are either ovarian epithelial carcinomas (cancer that begins in the cells on the surface of the ovary) or malignant germ cell tumors (cancer that begins in egg cells).