OBJECTIVE:To determine the optimal surgical margins in nephron-sparing surgery (NSS) for T1b renal cell carcinomas (RCC).
MATERIALS AND METHODS: We retrospectively assessed 87 T1b RCC specimens after radical nephrectomy through whole-kidney continuous sections, with 92 T1a RCCs included as controls. The completeness of pseudocapsule (PS) and extra-PS lesions and multifocality were microscopically examined, as was the greatest distance between extra-PS lesions and primary tumors.
RESULTS: The rates of incomplete PS (34% [30/87] vs 18% [17/92], P = .015) and positive cancer lesions beyond the PS (39% [34/87] vs 25% [23/92], P = .043) were significantly higher in the T1b than in the T1a group. All extra-PS lesions were located within 3.0 mm of the primary tumor. Multifocal tumors were found in 6% (5/87) of patients with T1b and 5% (5/92) of patients with T1a tumors (P = .928).
CONCLUSION: These results indicate that 4 mm may be the optimal surgical margin for NSS for patients with T1b RCC because all extra-PS lesions were located within 3 mm of the primary tumors.
Written by:
Chen XS, Zhang ZT, Du J, Bi XC, Sun G, Yao X. Are you the author?
Department of Genitourinary Oncology, Tianjin Medical University Cancer Institute & Hospital, Tianjin, China.
Reference: Urology. 2012 Apr;79(4):836-9.
doi: 10.1016/j.urology.2011.11.023
PubMed Abstract
PMID: 22305422
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