Amifostine is an organic thiophosphate cytoprotective agent known chemically as 2-[(3¬ aminopropyl)amino]ethanethiol dihydrogen phosphate (ester), it’s adjuvant used in cancer chemotherapy and radiotherapy involving DNA-binding chemotherapeutic agents. It is marketed under the trade name Ethyol. Amifostine is a prodrug and is dephosphorylated by alkaline phosphatase in tissues to a pharmacologically active free thiol metabolite. This metabolite is believed to be responsible for the reduction of the cumulative renal toxicity of cisplatin and for the reduction of the toxic effects of radiation on normal oral tissues. The ability of Ethyol to differentially protect normal tissues is attributed to the higher capillary alkaline phosphatase activity, higher pH and better vascularity of normal tissues relative to tumor tissue, which results in a more rapid generation of the active thiol metabolite as well as a higher rate constant for uptake into cells. The higher concentration of the thiol metabolite in normal tissues is available to bind to, and thereby detoxify, reactive metabolites of cisplatin. This thiol metabolite can also scavenge reactive oxygen species generated by exposure to either cisplatin or radiation. Healthy cells are preferentially protected because amifostine and metabolites are present in healthy cells at 100-fold greater concentrations than in tumor cells.

Razoxane (ICRF 159; (±)1,2-di(3,5-dioxopiperazin-1-yl) propane) belongs to the family of bis-dioxopiperazines, developed in the 1960s as derivatives of the chelating agent EDTA. It exerts antineoplastic, antiangiogenic, and antimetastatic activities. It is an inhibitor of topoisomerase II. Razoxane is a cytostatic agent, blocks the entry of cultured human lymphocytes into mitosis and arrests dividing cells in prophase and early metaphase. Razoxane is an effective drug in the systemic treatment of psoriasis.

Dexrazoxane is a cardioprotective drug used in patients with breast cancer to reduce cardiomyopathy associated with doxorubicin administration. Dexrazoxane is believed to act by two mechanisms: it inhibits DNA topoisomerase II and acts as a chelator for iron ions.

Razoxane (ICRF 159; (±)1,2-di(3,5-dioxopiperazin-1-yl) propane) belongs to the family of bis-dioxopiperazines, developed in the 1960s as derivatives of the chelating agent EDTA. It exerts antineoplastic, antiangiogenic, and antimetastatic activities. It is an inhibitor of topoisomerase II. Razoxane is a cytostatic agent, blocks the entry of cultured human lymphocytes into mitosis and arrests dividing cells in prophase and early metaphase. Razoxane is an effective drug in the systemic treatment of psoriasis.