Hammer, Dr. Armand    founder of Occidental Petroleum and co-founder of STOP CANCER

Handler, Ruth Award    STOP CANCER research grant given in honor of Ruth Mosko Handler, philanthropist and inventor of the Barbie doll as well as breast prostheses for cancer surgery patients

haploinsufficiency    genetic defect in which an organism has only one of two required pairs of genes to reproduce the corresponding genetic trait

hematologic    having to do with the blood

hematology    study of the causes and practice of treating various disease of the blood

hematopoiesis     (related to) the process of forming new blood cells

hematopoietic    related to the process of forming new blood cells

hemophilia    an inherited blood disease in which blood clotting does not occur readily

hepatobiliary    related to the liver, gall bladder, bile, and bile ducts

hepatocellular    involving liver cells

hepatology    related to diseases of the liver

heterozygosity    having two different alleles (versions) of the same gene (trait)

histone    protein found in genetic material that plays a role in controlling their activity

Hodgkin's lymphoma    cancer of the lymphatic system, which may spread to other parts of the body. It is one of two common types of cancers of the lymphatic system. The other type, called non-Hodgkin's lymphoma, is more common

hybridization    mixing different species or varieties of animals or plants to produce hybrids