gastroenterology     medical specialty dealing with disorders of the digestive system

gastroesophageal reflux disease (GERD)    chronic regurgitation of stomach contents and acid up into the esophagus, which can result in damage to the lining of the esophagus and, more rarely, in Barrett's esophagus, which can become cancerous

gastrointestinal    referring to the alimentary canal, which includes the esophagus, stomach, and small and large intestines

genitourinary (GU)     relating to the genitals and urinary tract, including the prostate gland, bladder, kidneys, and testes

genomics    study of genetics of organisms according to genomes, or sequences of DNA

genotype    expression of an organism according to its genes

germinal center    site within a lymph node from which B cells grow

glioblastoma    the most aggressive form of brain cancer

glioma    A cancer of the brain that begins in glial cells (cells that surround and support nerve cells)

gynecologic    related to the female organs of reproduction, including the uterus and ovaries

Kim Gregory    late CEO of Hansen Mechanical and benefactor of STOP CANCER, died of pancreatic cancer in 2008, and for whom a STOP CANCER Award is named