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2016 ; 34
(6
): 259.e1-8
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Histological subtype of renal cell carcinoma significantly affects survival in
the era of partial nephrectomy
#MMPMID26947350
Nguyen DP
; Vertosick EA
; Corradi RB
; Vilaseca A
; Benfante NE
; Touijer KA
; Sjoberg DD
; Russo P
Urol Oncol
2016[Jun]; 34
(6
): 259.e1-8
PMID26947350
show ga
OBJECTIVES: To analyze whether the histological subtype of renal cell carcinoma
(RCC) affects survival after surgical resection in contemporary patients, and if
so, whether prognostic significance differs according to the type of surgical
resection or tumor stage. MATERIALS AND METHODS: From 2006 to 2014, 2,237
patients underwent surgical resection (25% radical nephrectomy and 75% partial
nephrectomy [PN]) for nonmetastatic RCC at a tertiary referral center. Estimated
survival function curves and Cox regression models evaluated the effect of
histological subtype on recurrence-free survival (RFS) and overall survival (OS).
Interaction analyses tested whether the effect of histological subtype depends on
the type of surgical resection or tumor stage. RESULTS: Patients with RCC stage
T2 or lower and those with low-grade conventional clear cell, papillary or
chromophobe RCC of any stage had 5-year RFS probabilities>90%. Patients with
clear cell papillary RCC stage T3 or greater had predicted 5-year RFS of 81%.
However, 5-year OS probabilities were>94% for clear cell papillary RCC of any
stage. High-grade conventional clear cell and papillary RCC stage T2 or lower,
low-grade conventional clear cell and chromophobe RCC of any stage conferred
5-year OS probabilities of >93%. Unclassified RCC demonstrated the lowest OS
probabilities at any stage. In multivariable analyses, histological subtype
affected RFS (P<0.0001) and OS (P = 0.026) following surgical resection, with no
differences in this association for radical nephrectomy vs. PN (RFS, P = 0.2; OS,
P = 0.4), and across pathologic stages (RFS, P = 0.1; OS, P = 0.3). Compared with
low-grade conventional clear cell RCC, chromophobe (hazard ratio [HR] = 0.72, 95%
CI: 0.30-1.75) and papillary RCC (HR = 0.30, 95% CI: 0.09-0.97) conferred lower
risk of recurrence. Chromophobe (HR = 0.67, 95% CI: 0.30-1.52) and clear cell
papillary RCC (HR = 0.91, 95% CI: 0.12-6.78) conferred the lowest risk of
all-cause mortality. CONCLUSIONS: In the era of PN for RCC, histological subtype
remained a significant predictor of survival, regardless of type of surgical
resection or tumor stage.