The Impact of Bone Metastasis Location in the Clinical Outcome of Patients with Metastatic Renal Cell Carcinoma (mRCC): An Analysis from the Latin American Renal Cancer Group (LARCG)

LARCG

Abstract

Background

Tumor burden and metastatic disease sites are well-established prognostic factors in many malignancies, including metastatic Renal Cell Carcinoma (mRCC).

Objective

We aimed to evaluate the impact of bone metastasis (BM) location on clinical outcome of mRCC patients.

Methods

This study is a retrospective analysis of 4060 mRCC patients from the Latin American Renal Cancer Group (LARCG) database. Clinico-pathological characteristics, 24-months-survival, overall survival (OS), and BM sites were collected. To estimate the association between BM location and clinical outcomes we used Cox regression method

Results

Out of 4060 patients, 530 (14.5%) had metastatic disease. Among those, we analyzed the fifty-six that had only BM. The median follow-up was 20.8 months (range from 0 to 188 months). Non-spinal BM (NSBM) were identified in 33 (58.9%) patients and spinal BM (SBM) in 23 (41.1%) patients. Median OS was 35 months, and 24- months OS was 76% for patients with NSBM and 46% with SBM (HR: 2.22). In multivariable analysis SBM (HR: 3.08), ASA classification 3-4 (HR: 2.37), non-cc histology (HR: 5.11), and age (HR 1.06) were independent prognostic factors for OS.

Conclusions

Our study showed that SBM predicted shorter OS, suggesting that the location of BM may impact the clinical outcome of patients with mRCC.

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