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Etoposide, sold under the brand name Vepesid among others, is a chemotherapy medication used for the treatments of a number of types of cancer including testicular cancer, lung cancer, lymphoma, leukemia, neuroblastoma, and ovarian cancer. It is also used for hemophagocytic lymphohistiocytosis. It is used by mouth or injection into a vein.
Read the full article on Wikipedia“Etoposide forms a ternary complex with DNA and the topoisomerase II enzyme, which is an enzyme that aids in relaxing negative or positive supercoils in DNA. Topoisomerase II normally will form a double-stranded break in one DNA double-strand, allow another to pass through, and re-ligate the broken strands. Etoposide's binding prevents topoisomerase II from re-ligating the broken DNA strands, which causes the DNA breaks made by topoisomerase II to stay broken, and also prevents the topoisomerase II molecule from leaving the site and relieving tension elsewhere. This results in a double-strand break in the DNA that can have various deleterious effects on the cell, and depletion of topoisomerase II available to relieve further tension. Cancer cells rely on this enzyme more than healthy cells, since they divide more rapidly. Therefore, this causes errors in DNA synthesis and promotes apoptosis of the cancer cell.”
“Oral: 6 h., IV: 6-12 h., IV in children: 3 h.”
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