Early significant tumor volume reduction after radiosurgery in brain metastases from renal cell carcinoma results in long-term survival

Int J Radiat Oncol Biol Phys. 2012 Apr 1;82(5):1749-55. doi: 10.1016/j.ijrobp.2011.03.044. Epub 2011 Jun 2.

Abstract

Purpose: To retrospectively evaluate survival of patients with brain metastasis from renal cell carcinoma (RCC) after radiosurgery.

Patients and methods: Between 1998 and 2010, 46 patients were treated with radiosurgery, and the total number of lesions was 99. The mean age was 58.9 years (range, 33-78 years). Twenty-six patients (56.5%) had a single brain metastasis. The mean tumor volume was 3.0 cm(3) (range, 0.01-35.1 cm(3)), and the mean marginal dose prescribed was 20.8 Gy (range, 12-25 Gy) at the 50% isodose line. A patient was classified into the good-response group when the sum of the volume of the brain metastases decreased to less than 75% of the original volume at a 1-month follow-up evaluation using MRI.

Results: As of December 28, 2010, 39 patients (84.8%) had died, and 7 (15.2%) survived. The overall median survival time was 10.0 ± 0.4 months (95% confidence interval, 9.1-10.8). After treatment, local tumor control was achieved in 72 (84.7%) of the 85 tumors assessed using MRI after radiosurgery. The good-response group survived significantly longer than the poor-response group (median survival times of 18.0 and 9.0 months, respectively; p = 0.025). In a multivariate analysis, classification in the good-response group was the only independent prognostic factor for longer survival (p = 0.037; hazard ratio = 0.447; 95% confidence interval, 0.209-0.953).

Conclusions: Radiosurgery seems to be an effective treatment modality for patients with brain metastases from RCC. The early significant tumor volume reduction observed after radiosurgery seems to result in long-term survival in RCC patients with brain metastases.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Analysis of Variance
  • Brain Neoplasms / mortality
  • Brain Neoplasms / secondary*
  • Brain Neoplasms / surgery*
  • Carcinoma, Renal Cell / mortality
  • Carcinoma, Renal Cell / secondary*
  • Carcinoma, Renal Cell / surgery*
  • Humans
  • Kidney Neoplasms*
  • Magnetic Resonance Imaging
  • Middle Aged
  • Radiosurgery / methods*
  • Radiosurgery / mortality
  • Retrospective Studies
  • Survival Analysis
  • Tumor Burden / radiation effects*