Pegylated liposomal doxorubicin plus paclitaxel as an individualized chemosensitivity-directed treatment in advanced metastatic melanoma
8551 Background: Melanoma is a cutaneous neoplasm known for its high agressiveness and its poor prognosis once metastasized. Dacarbacine chemotherapy is actually considered standard first-line treatment of metastatic melanoma, with reported response rates of 6–7%. Due to this unsatisfactory situation, a number of non-standard anti-cancer drugs have been tested for improved efficacy. The present study was aimed to test doxorubicin plus paclitaxel in metastatic melanoma patients based on in-vitro chemosensitivity of this drug combination in fresh tumor samples. Methods: The primary study endpoint was objective response, secondary endpoints were safety and overall survival. Patients with histologically confirmed metastatic melanoma (AJCC stage IV), measurable tumor parameters, and an in-vitro chemosensitivity to doxorubicin plus paclitaxel which is superior to other test drugs determined by an ATP-based luminescence viability assay, were eligible. Patients received paclitaxel 175 mg/m2 i.v. followed by pegylated liposomal doxorubicin 30 mg/m2 i.v. at d1 every 28 days. Tumor assessment was performed every 8 weeks and evaluated according to RECIST. Treatment was continued at a tumor response of stable disease (SD) or better, and stopped in case of disease progression (PD) or intolerable side effects. Results: Out of 14 patients enrolled into this study, 12 received study treatment as first-line, and two as second-line therapy. Objective response was 14.3% (1 CR, 1 PR); progression arrest was 28.6% (1 CR, 1 PR, 2 SD). Median overall survival was 9.7 months. Common slight to moderate side effects were myelosuppression and neurotoxicity. Severe toxicities (CTC grade 3/4) were experienced by three patients (21.4%), with two of them presenting severe myelosuppression, and one experiencing myocardial infarction. Conclusions: Pegylated liposomal doxorubicin combined with paclitaxel shows significant efficacy in advanced metastatic melanoma if applied in an individualized, sensitivity- directed regimen. The observed side effects were comparable to other combination chemotherapies. This treatment regimen needs further evaluation in larger clinical trials containing standard therapy control groups. No significant financial relationships to disclose.