hydroxyurea

Hydroxyurea (Hydroxycarbamide), an antineoplastic agent, inhibits DNA synthesis through the inhibition of ribonucleoside diphosphate reductase.

A-69412 (N-1-(Fur-3-ylethyl)-N-hydroxyurea) is a reversible, specific inhibitor of the hydrophilic 5-lipoxygenase. It has the potential to treat ulcerative colitis and asthma, and possibly other inflammatory and allergic conditions.

Zileuton (A 64077) is a synthetic derivative of hydroxyurea with antiasthmatic properties. The leukotriene inhibitor zileuton blocks 5-lipoxygenase, which catalyzes the formation of leukotrienes from arachidonic acid; causes bronchodilation; decreases bronchial mucous secretion and edema; and may prevent or decrease the symptoms of asthma.

NU6027 is a potent ATR CDK inhibitor, inhibits CDK1 2, ATR and DNA-PK with Ki of 2.5 μM 1.3 μM, 0.4 μM and 2.2 μM, enter cells more readily than the 6-aminopurine-based inhibitors.

Pipobroman (Vercyte) is an anti-cancer drug that probably acts as an alkylating agent. Pipobroman has well documented clinical activity in polycythemia vera (PV) and essential thrombocythemia (ET). Pipobroman allows, within 3 months, to attain a response in more than 90% of patients, without clinically relevant toxicities. The 10-years risk of thrombosis of patients treated with Pipobroman is about 15%, The anti-proliferative activity of Pipobroman on bone marrow megakaryocytes seems of particular value in lowering the occurrence of post-PV and post-ET MMM, whose risk is the lowest registered with available treatments. The 10-year risk of acute leukemia with Pipobroman is 5% in PVand 3% in ET, which is only slightly higher than that expected as a natural evolution of the disease. In conclusion, the use of Pipobroman is a definite alternative to hydroxyurea in patients with PV and ET at high risk of thrombosis.

MI-223 is an inhibitor of Mcl-1-stimulated homologous recombination (HR) DNA repair, which leads to sensitization of cancer cells to hydroxyurea- or olaparib-induced DNA replication stress.