TY - JOUR
T1 - Increased Serum Leptin Levels and Over Expression of Leptin Receptors are Associated With the Invasion and Progression of Renal Cell Carcinoma
AU - Horiguchi, Akio
AU - Sumitomo, Makoto
AU - Asakuma, Junichi
AU - Asano, Takako
AU - Zheng, Rong
AU - Asano, Tomohiko
AU - Nanus, David M.
AU - Hayakawa, Masamichi
PY - 2006/10/1
Y1 - 2006/10/1
N2 - 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.
AB - 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.
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U2 - 10.1016/j.juro.2006.06.039
DO - 10.1016/j.juro.2006.06.039
M3 - Article
C2 - 16952705
AN - SCOPUS:33748098353
VL - 176
SP - 1631
EP - 1635
JO - Investigative Urology
JF - Investigative Urology
SN - 0022-5347
IS - 4
ER -