PURPOSE: Endothelins and their cell membrane receptors (ET(A)R and ET(B)R) are implicated in neoplastic pathogenesis. atrasentan, a potent, selective ET(A)R antagonist, has a direct effect on tumor proliferation, apoptosis, and angiogenesis. This study was designed to assess the influence of atrasentan on paclitaxel pharmacokinetics and to determine the safety and efficacy of atrasentan in combination with paclitaxel-carboplatin. EXPERIMENTAL DESIGN: Chemonaive patients with stage IIIB (malignant pleural effusion) and IV non-small cell lung cancer were enrolled. Toxicity and response were determined using the National Cancer Institute Common Toxicity Criteria version 2.0 and Response Evaluation Criteria in Solid Tumors criteria, respectively. Treatment consisted of paclitaxel (225 mg/m(2)) and carboplatin (area under the curve, 6) administered on day 1 every 3 weeks. A fixed 10 mg daily oral dose ofAtrasentan was administered continuously, starting on day 4 of cycle 1. Paclitaxel clearance was calculated during the first two cycles (pre- and post-atrasentan) in the first 10 patients. RESULTS: All 44 patients were evaluable for survival, toxicity, and response. No significant change in mean paclitaxel clearance was detected (mean +/- SD, 21.2 +/- 4.5 L/h versus 21.3 +/- 4.9 L/h) for pre- and post-atrasentan values, respectively (P = 0.434). Grade 3/4 toxicities > or = 10% were lymphopenia (22.7%), neutropenia (20.5%), dyspnea (11.4%), and hyperglycemia (11.4%). Response rate was 18.2%, with progression-free survival of 4.2 months, median survival of 10.6 months, and 1-year survival of 43%. CONCLUSION: Atrasentan plus paclitaxel-carboplatin was safe and well tolerated, with no apparent paclitaxel-atrasentan pharmacokinetic interaction. Efficacy and survival in advanced non-small cell lung cancer were comparable with studies of chemotherapy alone.
PURPOSE: Endothelins and their cell membrane receptors (ET(A)R and ET(B)R) are implicated in neoplastic pathogenesis. atrasentan, a potent, selective ET(A)R antagonist, has a direct effect on tumor proliferation, apoptosis, and angiogenesis. This study was designed to assess the influence of atrasentan on paclitaxel pharmacokinetics and to determine the safety and efficacy of atrasentan in combination with paclitaxel-carboplatin. EXPERIMENTAL DESIGN: Chemonaive patients with stage IIIB (malignant pleural effusion) and IV non-small cell lung cancer were enrolled. Toxicity and response were determined using the National Cancer Institute Common Toxicity Criteria version 2.0 and Response Evaluation Criteria in Solid Tumors criteria, respectively. Treatment consisted of paclitaxel (225 mg/m(2)) and carboplatin (area under the curve, 6) administered on day 1 every 3 weeks. A fixed 10 mg daily oral dose ofAtrasentan was administered continuously, starting on day 4 of cycle 1. Paclitaxel clearance was calculated during the first two cycles (pre- and post-atrasentan) in the first 10 patients. RESULTS: All 44 patients were evaluable for survival, toxicity, and response. No significant change in mean paclitaxel clearance was detected (mean +/- SD, 21.2 +/- 4.5 L/h versus 21.3 +/- 4.9 L/h) for pre- and post-atrasentan values, respectively (P = 0.434). Grade 3/4 toxicities > or = 10% were lymphopenia (22.7%), neutropenia (20.5%), dyspnea (11.4%), and hyperglycemia (11.4%). Response rate was 18.2%, with progression-free survival of 4.2 months, median survival of 10.6 months, and 1-year survival of 43%. CONCLUSION:Atrasentan plus paclitaxel-carboplatin was safe and well tolerated, with no apparent paclitaxel-atrasentan pharmacokinetic interaction. Efficacy and survival in advanced non-small cell lung cancer were comparable with studies of chemotherapy alone.
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