[G-I]

Gallblader Cancer

Gallbladder cancer is a rare disease in which malignant (cancer) cells are found in the tissues of the gallbladder. The gallbladder is a pear-shaped organ that lies just under the liver in the upper abdomen. Thegallbladder stores bile, a fluid made by the liver to digest fat. 

Gastric [Stomach] Cancer

 Gastric (stomach) cancer is a disease in which malignant (cancer) cells form in the lining of the stomach. The stomach is in the upper abdomen and helps digest food. Almost all gastric cancers are adenocarcinomas (cancers that begin in cells that make and release mucus and other fluids).

Gastrointestinal Cancer

 A gastrointestinal carcinoid tumor is cancer that forms in the lining of the gastrointestinal tract. Health history can affect the risk ofgastrointestinal carcinoid tumors. Some gastrointestinal carcinoid tumors have no signs or symptoms in the early stages.  

Gastrointestinal Stromal Tumor

A gastrointestinal stromal tumor (GIST) is a type of tumor that occurs in the gastrointestinal tract, most commonly in the stomach or small intestine. The tumors are thought to grow from specialized cells found in the gastrointestinal tract called interstitial cells of Cajal (ICCs) or precursors to these cells.  

Germ Cell Tumor

A germ cell tumor (GCT) is a neoplasm derived from germ cells. Germ cell tumors can be cancerous or non-cancerous tumors. Germ cellsnormally occur inside the gonads (ovary and testis).  

Gestational trophoblastic disease  

Gestational trophoblastic disease (GTD) is a group of conditions in which tumors grow inside a woman's uterus (womb). The abnormal cells start in the tissue that would normally become the placenta, the organ that develops during pregnancy to feed the fetus.

Glioma

It is a malignant tumor of the glial tissue of the nervous system. Glioma is a common type of primary brain tumor, accounting for about 33% of these tumors. Gliomas originate in the glial cells in the brain. Glial cells are the tissue that surrounds and supports neurons in the brain.  

Hairy Cell Leukemia 

Hairy cell leukemia (HCL) is a rare type of blood and bone marrow cancer that affects the B-lymphocytes (a type of white blood cells that make antibodies that fight infections).  

Head and Neck Cancer

Head and neck cancer is cancer that starts in the lip, oral cavity (mouth), nasal cavity (inside the nose), paranasal sinuses, pharynx, larynx or parotid glands. Most head and neck cancers are biologically similar.  

Heart Cancer

Heart cancer (primary cardiac tumor) is cancer that arises in the heart. Cancerous (malignant) tumors that begin in the heart are most often sarcomas, a type of cancer that originates in the soft tissues of the body. The vast majority of heart tumors are noncancerous (benign).  

Hepatocellular carcinoma  

Hepatocellular carcinoma (HCC, also called malignant hepatoma) is the most common type of liver cancer. Most cases of HCC are secondary to either a viral hepatitis infection (hepatitis B or C) or cirrhosis (alcoholism being the most common cause of liver cirrhosis).  

Langerhans cell histiocytosis  

Langerhans cell histiocytosis (LCH) is a rare disease involving clonal proliferation ofLangerhans cells, abnormal cells deriving from bone marrow and capable of migrating from skin to lymph nodes. 

Hodgkin Lymphoma

Hodgkin disease (Hodgkin lymphoma) is a type of lymphoma, a cancer that starts in white blood cells called lymphocytes. Lymphocytes are part of the immune system. There are 2 kinds of lymphomas:Hodgkin disease (named after Dr. Thomas Hodgkin, who first recognized it). 

Hypopharyngeal cancer 

Hypopharyngeal cancer is a disease in which malignant cells grow in the hypopharynx (the area where the larynx and esophagus meet). It first forms in the outer layer (epithelium) of the hypopharynx (last part of the pharynx), which is split into three areas.

Intraocular Melanoma

Intraocular melanoma is a disease in which malignant (cancer) cells form in the tissues of the eye. Intraocular melanoma begins in the middle of three layers of the wall of the eye. The outer layer includes the white sclera (the "white of the eye") and the clear cornea at the front of the eye.  

Islet Cell Tumors, Pancreatic Neuroendocrine Tumors

Pancreatic neuroendocrine tumors form in hormone-making cells(islet cells) of the pancreas. The pancreas is a gland about 6 inches long that is shaped like a thin pear lying on its side. The wider end of thepancreas is called the head, the middle section is called the body, and the narrow end is called the tail.