G Q Phan1, P Attia, S M Steinberg, D E White, S A Rosenberg. 1. Surgery Branch and Biostatistics and Data Management Section, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892-1502, USA.
Abstract
PURPOSE: The present study attempted to identify characteristics that correlated with clinical response to interleukin (IL)-2 therapy in patients with metastatic melanoma. PATIENTS AND METHODS: We retrospectively evaluated laboratory and clinical characteristics of 374 consecutive patients with metastatic melanoma treated with high-dose intravenous bolus IL-2 (720,000 IU/kg) from July 1, 1988, to December 31, 1999, at the Surgery Branch of the National Cancer Institute. RESULTS: The overall objective response rate was 15.5%. Pretreatment parameters such as patient demographics, laboratory values, and prior therapy did not correlate with response; however, 53.6% of patients with only subcutaneous and/or cutaneous metastases responded, compared with 12.4% of patients with disease at other sites (P2 =.000001). During therapy, patients who were responders tended to have received more doses during course 1 (16.2 +/- 0.3 doses v 14.5 +/- 0.2 doses; P2 =.0095); however, when limited to patients who were able to complete both cycles of course 1, there was no statistically significant difference (P2 =.27). Responders had a higher maximum lymphocyte count immediately after therapy compared with nonresponders (P2 =.0026). The development of abnormal thyroid function tests and vitiligo after therapy was associated with response (thyroid-stimulating hormone, P2 =.01; free T4, P2 =.0049; vitiligo, P2 < 10(-6)), although thyroid dysfunction may have been related more to the length of IL-2 therapy than to response. CONCLUSION: The presence of metastases only to subcutaneous and/or cutaneous sites, lymphocytosis immediately after treatment, and long-term immunologic side effects, especially vitiligo, were associated with antitumor response to IL-2 therapy.
PURPOSE: The present study attempted to identify characteristics that correlated with clinical response to interleukin (IL)-2 therapy in patients with metastatic melanoma. PATIENTS AND METHODS: We retrospectively evaluated laboratory and clinical characteristics of 374 consecutive patients with metastatic melanoma treated with high-dose intravenous bolus IL-2 (720,000 IU/kg) from July 1, 1988, to December 31, 1999, at the Surgery Branch of the National Cancer Institute. RESULTS: The overall objective response rate was 15.5%. Pretreatment parameters such as patient demographics, laboratory values, and prior therapy did not correlate with response; however, 53.6% of patients with only subcutaneous and/or cutaneous metastases responded, compared with 12.4% of patients with disease at other sites (P2 =.000001). During therapy, patients who were responders tended to have received more doses during course 1 (16.2 +/- 0.3 doses v 14.5 +/- 0.2 doses; P2 =.0095); however, when limited to patients who were able to complete both cycles of course 1, there was no statistically significant difference (P2 =.27). Responders had a higher maximum lymphocyte count immediately after therapy compared with nonresponders (P2 =.0026). The development of abnormal thyroid function tests and vitiligo after therapy was associated with response (thyroid-stimulating hormone, P2 =.01; free T4, P2 =.0049; vitiligo, P2 < 10(-6)), although thyroid dysfunction may have been related more to the length of IL-2 therapy than to response. CONCLUSION: The presence of metastases only to subcutaneous and/or cutaneous sites, lymphocytosis immediately after treatment, and long-term immunologic side effects, especially vitiligo, were associated with antitumor response to IL-2 therapy.
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