Increased Serum Leptin Levels and Over Expression of Leptin Receptors are Associated With the Invasion and Progression of Renal Cell Carcinoma

Akio Horiguchi, Makoto Sumitomo, Junichi Asakuma, Takako Asano, Rong Zheng, Tomohiko Asano, David M. Nanus, Masamichi Hayakawa

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Purpose: Leptin, an adipocyte derived cytokine that is closely associated with obesity, was recently shown to be involved in carcinogenesis and cancer progression. Because obesity is a significant risk factor for renal cell carcinoma, we investigated the link between leptin and the development of renal cell carcinoma. Materials and Methods: Associations between preoperative serum leptin levels and leptin receptor expression in tumor specimens and various clinicopathological parameters were analyzed in 57 patients with renal cell carcinoma. Results: Serum leptin levels were 1.2 to 16.2 ng/ml (mean 4.5). Of 57 tumors 22 (38.6%) demonstrated high leptin receptor expression. Serum leptin levels were significantly higher in patients with vs without tumor specimen venous invasion (p = 0.030) and higher in patients with high vs low leptin receptor expression (p = 0.019). There were significant associations between high leptin receptor expression and the presence of venous invasion (p = 0.013), histological type (p = 0.0076) and regional lymph node metastasis (p = 0.047). Of 42 patients with N0M0 disease those with serum leptin 5.0 ng/ml or more had significantly shorter progression-free survival than patients with lower levels (p = 0.0043). Multivariate Cox proportional hazards model analysis demonstrated that higher serum leptin was an independent predictor of progression-free survival (p = 0.0406). Conclusions: Leptin and leptin receptor could have a key role in the invasion of renal cell carcinoma and they could be valuable predictors of progression.

Original languageEnglish
Pages (from-to)1631-1635
Number of pages5
JournalJournal of Urology
Volume176
Issue number4
DOIs
Publication statusPublished - 01-10-2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Urology

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