Prognostic value of serum creatine level in patients with vulvar cancer.

Vulvar cancer is a rare malignancy with poor prognosis that generally occurs in elderly patients. The individual prognosis is difficult to assess. Serum creatinine levels are frequently elevated in elderly patients. Recent evidence have shown shown that - besides indicating kidney impairment - serum creatinine levels may be used to predict the survival in cancer patients. Several studies observed an association between elevated serum creatinine levels and poor prognosis in patients with solid tumors. In this retrospective cohort study, serum creatinine levels were evaluated in 170 patients with invasive vulvar cancer. Serum creatinine levels were correlated to established clinicopathologic factors. Univariate and multivariate survival analysis were performed. Elevated serum creatinine levels (>1.2 mg/dl) were significantly associated with both poor disease specific and overall survival. Three year overall survival rates were 74.8% and 32.5% for patients with serum creatinine levels of ≤ and >1.2 mg/dl, respectively. In a multivariate survival model, serum creatinine levels were significantly associated with overall survival independent of tumor stage and patients' age. In conclusion, pretherapeutic serum creatinine levels may be useful as an independent prognostic parameter in patients with vulvar cancer.