The association of C-reactive protein with major depressive symptoms in nonmetastatic renal cell carcinoma

Abstract Introduction and Objective: Patients with kidney cancer experience higher rates of depression compared with other cancer subtypes. Inflammation has been shown to contribute to depression associated with malignancy. Here, we assess the association between preoperative C-reactive protein (CRP) and major depression, as screened by the eight-item Patient Health Questionnaire (PHQ-8) depression scale, in patients undergoing nephrectomy for nonmetastatic renal cell carcinoma (RCC). Methods: Retrospective review of prospectively administered PHQ-8 surveys in patients who underwent nephrectomy for nonmetastatic RCC was conducted. Patients with available PHQ-8 within 180 days before and after surgery were included. The association of major depressive symptoms on preoperative PHQ-8 and clinical improvement on postoperative survey with patient/tumor characteristics and CRP levels was determined by the generalized chi-square test for categorical variables and analysis of variance for continuous variables. Multivariable logistic regression was used to analyze variables associated with major depression on PHQ-8 and postoperative survey improvement. Results: Two hundred forty-five patients were analyzed. Most were male (66%). Median age and body mass index were 65 and 28.9 kg/m 2 , respectively. 64.5% of patients were White, and 29.0% were Black. 30.2% had an elevated CRP (≥10 mg/L). 45 (18.4%) patients screened positive for major depressive symptoms on PHQ-8 (≥10 points). Patients with elevated CRP were more likely to have positive preoperative depression screening (odds ratio [OR] 2.66, 95% CI 1.08–6.52, P = .033) but had higher probability of demonstrating meaningful change on PHQ-8 after nephrectomy (OR 3.50, 95% CI 1.04–11.85, P = .044). Conclusion: In nonmetastatic RCC, patients with elevated preoperative CRP had higher scoring for major depressive symptoms on PHQ-8 and were more likely to demonstrate clinical improvement in depressive symptomatology after nephrectomy.