文摘
Purpose This randomized, double-blind, placebo-controlled Phase 2 study evaluated safety and efficacy of A(1-) for reduction in Grade 3- thrombocytopenia in patients receiving myelosuppressive chemotherapy. Pharmacodynamic activity of A(1-) in platelet production and retention of scheduled dose intensity were also determined. Methods Thirty-four patients with ovarian, Fallopian tube, or peritoneal carcinoma receiving gemcitabine and carboplatin or cisplatin were evaluated. Patients were randomized to receive study drug subcutaneously at 100?mcg/kg (n?=?11), 300?mcg/kg (n?=?13), or placebo (n?=?10) following chemotherapy for up to six cycles. Hematologic variables were obtained throughout each treatment cycle. Results There were no drug-related safety issues. There were no instances of Grade 4 thrombocytopenia in patients who received 100?mcg/kg treatment compared to 6?% of chemotherapy cycles for patients receiving placebo (p?=?0.07). The maximal percentage increase in platelet concentration from baseline was higher for patients who received 100?mcg/kg A(1-) compared to placebo (p?=?0.02). This increase was accompanied by a reduction in the nadir absolute neutrophil count (p?=?0.04). Relative dose intensity for the combination chemotherapy was higher for patients who received 100?mcg/kg A(1-) compared to placebo (p?=?0.04). There were no differences in outcomes for patients receiving 300?mcg/kg dose compared to placebo. Conclusions A 100?mcg/kg dose of A(1-) was shown to produce pharmacodynamic effects on peripheral blood platelet counts, preserve planned dose intensity, and reduce Grade 3- thrombocytopenia following gemcitabine and platinum chemotherapy. These findings are consistent with A(1-)-induced stimulation of thrombogenesis in the bone marrow following marrow-toxic chemotherapy.