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  • Title: Subcutaneous interleukin-2 and interferon alpha in the treatment of patients with metastatic renal cell carcinoma-Less efficacy compared with intravenous interleukin-2 and interferon alpha. Results of a multicenter Phase II trial from the Groupe Français d'Immunothérapie.
    Author: Ravaud A, Delva R, Gomez F, Chevreau C, Douillard JY, Peny J, Coudert B, Négrier S, Groupe Français d'Immunothérapie.
    Journal: Cancer; 2002 Dec 01; 95(11):2324-30. PubMed ID: 12436438.
    Abstract:
    BACKGROUND: The main objective of this trial was to evaluate the combination of subcutaneous (SC) interleukin-2 (IL-2) with interferon alpha-2a (IFN-alpha) in the treatment of patients with metastatic renal cell carcinoma (MRCC) compared with a previous trial that used continuous-infusion IL-2 and IFN-alpha with identical schedules and dosages. METHODS: Between April, 1997 and January, 1998, 66 patients with MRCC received SC IL-2 at a dose of 9 x 10(6) IU/m(2) twice daily for 5 days during 2 induction cycles and during 4 additional cycles, with a 3-week rest between cycles. Each induction cycle consisted of two 5-day courses of IL-2 separated by a 9-day break. IFN-alpha at a dose of 6 x 10(6) IU per day three times per week was given during induction cycles and additional cycles. RESULTS: All patients were assessable for response and toxicity. The median follow-up was 43 months. Thirty-five patients (51%) and 43 patients (63%) received >or= 80% of the planned induction doses of IL-2 and IFN-alpha, respectively. Five patients achieved objective responses (7.6%; 95% confidence interval [95%CI], 2.5-16.8%), with two complete responses. The median survival was 14 months (95%CI, 11.3-16.7 months). Fifty-three patients (80%) had at least one episode of Grade 3 toxicity related to treatment. Twenty-two patients developed Grade 4 toxicities, which included hypotension (24% of patients), decreased performance status (6% of patients), dyspnea (3% of patients), and mucositis (3% patients) as well as fever, ventricular tachycardia, and anemia. CONCLUSIONS: The current results seem to indicate reduced efficacy and higher toxicity rates with SC IL-2 plus IFN-alpha compared with the results from a previous trial that used an identical regimen with IV IL-2 administration. Although SC IL-2 regimens are used widely, their interest remains to be determined.
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