Commentary on Response of the primary tumor to neoadjuvant sunitinib in patients with advanced renal cell carcinoma: Thomas AA, Rini BI, Lane BR, Garcia J, Dreicer R, Klein EA, Novick AC, Campbell SC, Glickman Urological and Kidney Institute, Cleveland Cl

We assessed the activity of neoadjuvant sunitinib on primary renal tumors in patients with advanced renal cell carcinoma as well as the feasibility and safety of subsequent surgical resection. l of 19 patients with advanced renal cell carcinoma deemed unsuitable for initial nephrectomy due to locally advanced disease or extensive metastatic burden were treated with 50 mg sunitinib daily for 4 weeks-on and followed by 2 weeks-off. Tumor response was assessed by Response Evaluation Criteria in Solid Tumors every 2 cycles and the rate of conversion to resectable status was estimated. patient age was 64 years and initial median radiographic renal tumor size was 10.5 cm. Clinical stage was N+ (10) and M+ (15). No patient experienced a complete response. Partial responses of the primary tumor were noted in 3 patients (16%), 7 (37%) had stable disease, and 9 (47%) had disease progression in the primary tumor. Overall tumor response included 2 patients (11%) with partial response, 7 (37%) with stable disease, and 10 (53%) with disease progression. At a median follow-up of 6 months (range 1–15) 4 patients (21%) had undergone nephrectomy and 5 died of disease progression. No unexpected surgical morbidity was encountered. Viable tumor was present in all 4 specimens. Sunitinib was associated with grade 3–4 toxicity in 7 patients (37%) and treatment was discontinued in 1 due to toxicity. stration of sunitinib in patients with advanced renal cell carcinoma with the primary tumor in place is feasible and can lead to a reduction in tumor burden that can facilitate subsequent surgical resection.