Abstract
Introduction
Lipid metabolism has been suggested to be associated with clinical outcomes of renal
cell carcinoma (RCC). In this study, we aimed to investigate the relationship between
preoperative cholesterol level (PCL) and postoperative outcomes of patients with localized
RCC.
Materials and Methods
We retrospectively analyzed the data of 5022 patients surgically treated for nonmetastatic
RCC. According to the receiver operating curve of PCL for cancer-specific mortality,
we stratified the patients into 2 groups by using a cutoff value of 161 mg/dL. The
propensity scores for having low PCL were calculated, and the low PCL group was matched
with the high PCL group at a 1:2 ratio. The oncological profiles and postoperative
survival of patients were compared.
Results
A low cholesterol level was significantly associated with adverse pathologic findings,
such as higher pathologic stage (P < .001) and large tumor size (P = .002). Furthermore, the low cholesterol group showed significantly worse progression-free,
cancer-specific, and overall survival (all P values < .001) compared with the high cholesterol group. Multivariate analysis exhibited
a higher PCL as an independent predictor of better progression-free (P < .001), cancer-specific (P = .018), and overall survival (P = .001) after matching. Subgroup analysis according to tumor histology revealed that
PCL had a significant relationship with patients' survival in clear cell RCC, but
not in non–clear cell RCC.
Conclusion
Decreased PCL was significantly associated with worse pathologic outcomes and also
inferior postoperative survival in patients with localized RCC; however, those relationships
were significant only in clear cell subtypes.
Keywords
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Article info
Publication history
Published online: May 10, 2017
Accepted:
May 1,
2017
Received in revised form:
April 17,
2017
Received:
February 10,
2017
Identification
Copyright
© 2017 Elsevier Inc. All rights reserved.