Mitomycin C, Epirubicin and Cisplatin versus Mitomycin C Alone as Therapy for Carcinoma of Unknown Primary Origin

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Abstract
Carcinoma of unknown primary (CUP) site accounts for approximately 6.5% of all cancers. Optimal therapy for patients with CUP has not yet been delineated. The current study was undertaken to evaluate response, time to treatment failure and survival in patients with CUP treated with a combination regimen comprising mitomycin C, epirubicin and cisplatin (MEP) versus mitomycin C alone (MITOC). Eighty-four patients with CUP were randomised to receive either the combination (MEP) or MITOC. Both treatment arms were well matched for age, gender, performance status, dominant site and number of disease sites. Eighty of the above patients were evaluable. Twenty patients (50%) treated with MEP responded to treatment compared with 7 (17%) who received MITOC. Grade III–IV hemopoietic toxicity was documented in 2 patients treated with MEP and no patients treated with MITOC. A single patient treated with MEP developed grade I peripheral neuropathy. Median time to treatment failure was 4.5 months for patients receiving MEP as opposed to 2 months for those receiving MITOC (p = 0.05). Median survival was 9.4 months in patients treated with MEP compared to 5.4 months in those receiving MITOC (p = 0.05). This study indicates that the addition of cisplatin and epirubicin to MITOC results in a significant improvement in the response rate, time to treatment failure and survival in patients with adenocarcinoma of unknown primary site.

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