Abstract
Background
Insulin-like growth factor-1 (IGF1) pathway plays a critical role in malignant transformation, and epidemiology studies have also shown that single nucleotide polymorphisms (SNPs) in IGF1 pathway genes are associated with prostate cancer risk. However, the clinical significance of these SNPs on prostate cancer aggressiveness and prognosis after radical prostatectomy (RP) has not been determined.
Methods
We evaluated the associations of 4 common SNPs in IGF1 and IGF1R with age at diagnosis, preoperative prostate-specific antigen (PSA) level, pathologic Gleason score, pathologic stage, surgical margin, lymph node metastasis, and PSA recurrence in a cohort of 320 localized prostate cancer patients receiving RP. The prognostic significance on time to PSA recurrence was also assessed by Cox proportional hazards model.
Results
IGF1 rs2946834 alleles/genotypes and an IGF1 specific haplotype AT, containing the minor allele of rs2946834, were associated (P ≤ 0.028) with a 1.49- to 2.22-fold higher risk of having advanced-stage prostate cancer. In addition, a genetic interaction profile consisting of IGF1 rs2946834 and IGF1R rs2016347 was significantly associated with PSA recurrence (P = 0.033).
Conclusions
Our study is the first to evaluate the impact of SNPs in IGF1 pathway genes on PSA recurrence. A genetic interaction between IGF1 rs2946834 and IGF1R rs2016347 might be a predictor of outcomes following RP.
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Acknowledgment
This work was supported by the National Science Council (NSC), Taiwan (Grants NSC-98-2320-B-039-019-MY3, NSC-99-2314-B-037-018-MY3, and NSC-100-2314-B-039-009-MY3), China Medical University (Grant CMU99-COL-13), and Kaohsiung Medical University Hospital (Grant KMUH99-9R12). We thank Chao-Shih Chen for data analysis, and the National Center for Genome Medicine, NSC, Taiwan, for technical support.
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C.-F. Chang and J.-B. Pao contributed equally to this study.
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Chang, CF., Pao, JB., Yu, CC. et al. Common Variants in IGF1 Pathway Genes and Clinical Outcomes After Radical Prostatectomy. Ann Surg Oncol 20, 2446–2452 (2013). https://doi.org/10.1245/s10434-013-2884-y
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DOI: https://doi.org/10.1245/s10434-013-2884-y