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Published in: BMC Cancer 1/2013

Open Access 01-12-2013 | Research article

Insulin-like growth factor-1 genotypes and haplotypes influence the survival of prostate cancer patients with bone metastasis at initial diagnosis

Authors: Norihiko Tsuchiya, Shintaro Narita, Takamitsu Inoue, Mitsuru Saito, Kazuyuki Numakura, Mingguo Huang, Shingo Hatakeyama, Shigeru Satoh, Seiichi Saito, Chikara Ohyama, Yoichi Arai, Osamu Ogawa, Tomonori Habuchi

Published in: BMC Cancer | Issue 1/2013

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Abstract

Background

The insulin-like growth factor-1 (IGF-1) plays an important role in growth of prostate cancer (PCa) cells and facilitating the development and progression of PCa. This study aimed to evaluate the association of polymorphisms in three linkage disequilibrium (LD) blocks of the IGF-1 on the survival of metastatic PCa patients.

Methods

A total of 215 patients with bone metastases at initial presentation were included in this study. The cytosine-adenine (CA) repeat polymorphism and rs12423791 were selected as representative polymorphisms in the LD blocks 1 and 2, respectively. Haplotype in the LD block 3 was analyzed using two tag single nucleotide polymorphisms (SNPs), rs6220 and rs7136446. Cancer-specific survival rate was estimated from the Kaplan-Meier curve, and the survival data were compared using the log-rank test.

Results

Cancer-specific survival was significantly associated with the CA repeat polymorphism, rs12423791, and rs6220 (P = 0.013, 0.014, and 0.014, respectively). Although rs7136446 had no significant association with survival, the haplotype in the LD block 3 was significantly associated with cancer-specific survival (P = 0.0003). When the sum of the risk genetic factors in each LD block (19-repeat allele, C allele of rs12423791, or C-T haplotype) was considered, patients with all the risk factors had significantly shorter cancer specific-survival than those with 0–2 risk factors (P = 0.0003).

Conclusions

Polymorphisms in the IGF-1, especially a haplotype in the LD block 3, are assumed to be genetic markers predicting the outcome of metastatic PCa.
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Metadata
Title
Insulin-like growth factor-1 genotypes and haplotypes influence the survival of prostate cancer patients with bone metastasis at initial diagnosis
Authors
Norihiko Tsuchiya
Shintaro Narita
Takamitsu Inoue
Mitsuru Saito
Kazuyuki Numakura
Mingguo Huang
Shingo Hatakeyama
Shigeru Satoh
Seiichi Saito
Chikara Ohyama
Yoichi Arai
Osamu Ogawa
Tomonori Habuchi
Publication date
01-12-2013
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2013
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-13-150

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