A substance that blocks an enzyme needed by the body to make cholesterol and lowers the amount of cholesterol in the blood. HMG-CoA reductase inhibitor drugs … [Read more...]
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historical control subject
An individual treated in the past and used in a comparison group when researchers analyze the results of a clinical study that had no control group. The use of … [Read more...]
historic cohort study
A research study in which the medical records of groups of individuals who are alike in many ways but differ by a certain characteristic (for example, female … [Read more...]
histone deacetylase inhibitor
A substance that causes a chemical change that stops tumor cells from dividing. HDAC inhibitors are being studied in the treatment of cancer. Also called HDAC … [Read more...]
histamine dihydrochloride
A substance being studied in the treatment of some types of cancer and other conditions. When used together with interleukin-2, histamine dihydrochloride may … [Read more...]
hepatic portal vein
A blood vessel that carries blood to the liver from the stomach, small and large intestines, spleen, pancreas, and gallbladder. Also called portal vein. … [Read more...]
hemorrhoid
An enlarged or swollen blood vessel, usually located near the anus or the rectum. … [Read more...]
hemorrhage
In medicine, loss of blood from damaged blood vessels. A hemorrhage may be internal or external, and usually involves a lot of bleeding in a short time. … [Read more...]
hematoporphyrin derivative
A drug used in photodynamic therapy that is absorbed by tumor cells. When exposed to light, it becomes active and kills the cancer cells. … [Read more...]
hematopoietic growth factor
A group of proteins that causes blood cells to grow and mature. … [Read more...]