The antitumor mechanism of action for DTX is hyperstabilistation of microtubules.3 DTX binds preferentially to -subunit protein of tubulin in the microtubules and promotes assembly of tubulin into stable microtubules while simultaneously inhibiting their depolymerization. The formation of stable microtubule bundles disrupts the normal dynamic equilibrium between polymerization and depolymerization within the microtubule system and leads to cell cycle arrest at the G2/M phase and, ultimately, cell death. Although DTX has an antitumor mechanism of action similar to that of paclitaxel, DTX shows a higher affinity for the microtubule binding site and treatment of anthracycline-refractory metastatic breast cancer in 1996, and later for the treatment of platinum-refractory non-small-cell lung cancer, hormone refractory prostate cancer, head and neck cancer, advanced gastric cancer, and ovarian cancer.6–8 Despite its wide use for the treatment of various cancers, Taxotere is associated with serious side effects, including acute hypersensitivity reactions, cumulative fluid retention, neurotoxicity, febrile neutropenia, nail toxicity, myalgia, nasolacrimal duct stenosis and asthenia.9–11Phase II studies of Taxotere in the treatment of various solid tumors showed that the most frequent adverse effects were alopecia (81%), grade III-IV leucocytopenia of short duration (66%), skin reactions (52%), and hypersensitivity reactions (26%).12 These side effects are attributable to either DTX as a cytotoxic agent or the presence of P80.2,13
đang được dịch, vui lòng đợi..
