TY - JOUR
T1 - Obesity and renal cell carcinoma risk by histologic subtype
T2 - A nested case-control study and meta-analysis
AU - Callahan, Catherine L.
AU - Hofmann, Jonathan N.
AU - Corley, Douglas A.
AU - Zhao, Wei K.
AU - Shuch, Brian
AU - Chow, Wong Ho
AU - Purdue, Mark P.
N1 - Funding Information:
This research was supported by the Intramural Research Program of the NIH and the National Cancer Institute .
Publisher Copyright:
© 2018
PY - 2018/10
Y1 - 2018/10
N2 - Background: Although obesity is an established risk factor for renal cell carcinoma (RCC), it is unclear whether this relationship varies across histologic subtypes. Methods: We conducted a nested case-control study within the Kaiser Permanente Northern California (KPNC) health care network, and meta-analysis combining our results with those of previously published studies. Our KPNC study included 685 RCC cases [421 clear cell; 65 papillary; 24 chromophobe; 35 other; 141 not otherwise specified (NOS)] and 4266 controls. Subtype-specific odds ratios (ORs) and 95% confidence intervals (CIs) for categories of body mass index (BMI) and were computed from the case-control data using polytomous logistic regression. Findings from this and other relevant studies were combined by meta-analysis using a random effects model. Results: In the KPNC study, obesity (BMI ≥ 30 kg/m 2 ) was associated with clear cell RCC (OR 1.5, 95% CI 1.1–2.1) and chromophobe RCC (OR 2.5, 95%CI 0.8–8.1), but not with papillary RCC (OR 1.0, 95% CI 0.5–1.9). In meta-analysis including three additional studies, a similar pattern of summary relative risks (SRR) for obesity was observed across subtypes (clear cell: SRR 1.8, 95% CI 1.5–2.2; chromophobe: SRR 2.2, 95% CI 1.3–3.7; papillary, SRR 1.2, 95% CI 0.8–1.6). Conclusions: These findings support the hypothesis that histologic subtypes of RCC possess distinct etiologic pathways, with obesity important for the development of clear cell and, possibly, chromophobe RCC, but not papillary RCC.
AB - Background: Although obesity is an established risk factor for renal cell carcinoma (RCC), it is unclear whether this relationship varies across histologic subtypes. Methods: We conducted a nested case-control study within the Kaiser Permanente Northern California (KPNC) health care network, and meta-analysis combining our results with those of previously published studies. Our KPNC study included 685 RCC cases [421 clear cell; 65 papillary; 24 chromophobe; 35 other; 141 not otherwise specified (NOS)] and 4266 controls. Subtype-specific odds ratios (ORs) and 95% confidence intervals (CIs) for categories of body mass index (BMI) and were computed from the case-control data using polytomous logistic regression. Findings from this and other relevant studies were combined by meta-analysis using a random effects model. Results: In the KPNC study, obesity (BMI ≥ 30 kg/m 2 ) was associated with clear cell RCC (OR 1.5, 95% CI 1.1–2.1) and chromophobe RCC (OR 2.5, 95%CI 0.8–8.1), but not with papillary RCC (OR 1.0, 95% CI 0.5–1.9). In meta-analysis including three additional studies, a similar pattern of summary relative risks (SRR) for obesity was observed across subtypes (clear cell: SRR 1.8, 95% CI 1.5–2.2; chromophobe: SRR 2.2, 95% CI 1.3–3.7; papillary, SRR 1.2, 95% CI 0.8–1.6). Conclusions: These findings support the hypothesis that histologic subtypes of RCC possess distinct etiologic pathways, with obesity important for the development of clear cell and, possibly, chromophobe RCC, but not papillary RCC.
KW - Body mass index
KW - Case-control studies
KW - Histology
KW - Meta-analysis
KW - Renal cell carcinoma
UR - http://www.scopus.com/inward/record.url?scp=85049878425&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85049878425&partnerID=8YFLogxK
U2 - 10.1016/j.canep.2018.07.002
DO - 10.1016/j.canep.2018.07.002
M3 - Article
C2 - 30029068
AN - SCOPUS:85049878425
SN - 1877-7821
VL - 56
SP - 31
EP - 37
JO - Cancer Epidemiology
JF - Cancer Epidemiology
ER -