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Clinical Trial
. 2003 Aug 15;21(16):3127-32.
doi: 10.1200/JCO.2003.02.122.

Randomized study of high-dose and low-dose interleukin-2 in patients with metastatic renal cancer

Affiliations
Clinical Trial

Randomized study of high-dose and low-dose interleukin-2 in patients with metastatic renal cancer

James C Yang et al. J Clin Oncol. .

Abstract

Purpose: This three-arm randomized study compares response rates and overall survival of patients with metastatic renal cell cancer (RCC) receiving high-dose or one of two low-dose interleukin-2 (IL-2) regimens.

Patients and methods: Patients with measurable metastatic RCC and a good performance status were randomized to receive either 720,000 U/kg (high-dose [HD]) or 72,000 U/kg (low-dose [LD]), both given by intravenous (IV) bolus every 8 hours. After randomly assigning 117 patients, a third arm of low-dose daily subcutaneous IL-2 was added, and an additional 283 patients were randomly assigned.

Results: A total of 156 patients were randomly assigned to HD IV IL-2, and 150 patients to LD IV IL-2. Toxicities were less frequent with LD IV IL-2 (especially hypotension), but there were no IL-2-related deaths in any arm. There was a higher response proportion with HD IV IL-2 (21%) versus LD IV IL-2 (13%; P =.048) but no overall survival difference. The response rate of subcutaneous IL-2 (10%, partial response and complete response) was similar to that of LD IV IL-2, differing from HD IV (P =.033). Response durability and survival in completely responding patients was superior with HD IV compared with LD IV therapy (P =.04).

Conclusion: Major tumor regressions, as well as complete responses, were seen with all regimens tested. IL-2 was more clinically active at maximal doses, although this did not produce an overall survival benefit. The immunological factors which constrain the curative potential of IL-2 to only a small percentage of patients need to be further elucidated.

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Figures

Fig 1
Fig 1
(A) Overall survival of patients randomly assigned to either low-dose (LD) or high-dose (HD) intravenous (IV) bolus interleukin-2 (IL-2). (B) Overall survival of patients concurrently randomized to received IL-2 by either LD IV bolus, HD IV bolus, or daily subcutaneous (SQ) administration.
Fig 2
Fig 2
Survival of patients completely responding to high-dose versus low-dose intravenous interleukin-2.

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