Impact ofIGF-IandCYP19Gene Polymorphisms on the Survival of Patients With Metastatic Prostate Cancer

• DOI: 10.1200/jco.2005.02.9439
• Publication Date: 2006-04-28T22:28:22Z
• Authors: Norihiko Tsuchiya; Lizhong Wang; Hiroyoshi Suzuki; Takehiko Segawa; Hisami Fukuda; Shintaro Narita; Masaki Shimbo; Toshiyuki Kamoto; Kenji Mitsumori; Tomohiko Ichikawa; Osamu Ogawa; Akira Nakamura; Tomonori Habuchi
• Keywords: Aged, 80 and over; Male; 0301 basic medicine; Polymorphism, Genetic; Prostatic Neoplasms; Middle Aged; Prognosis; 3. Good health; 03 medical and health sciences; Aromatase; Humans; Insulin-Like Growth Factor I; Neoplasm Metastasis; Aged; Repetitive Sequences, Nucleic Acid

PurposeThe prognosis of metastatic prostate cancer significantly differs among individuals. While various clinical and biochemical prognostic factors for survival have been suggested, the progression and response to treatment of those patients may also be defined by host genetic factors. In this study, we evaluated genetic polymorphisms as prognostic predictors of metastatic prostate cancer.Patients and MethodsOne hundred eleven prostate cancer patients with bone metastasis at the diagnosis were enrolled in this study. Thirteen genetic polymorphisms were genotyped using polymerase chain reaction-restriction fragment length polymorphism or an automated sequencer with a genotyping software.ResultsAmong the polymorphisms, the long allele (over 18 [CA] repeats) of insulin-like growth factor-I (IGF-I) and the long allele (over seven [TTTA] repeats) of cytochrome P450 (CYP) 19 were significantly associated with a worse cancer-specific survival (P = .016 and .025 by logrank test, respectively). The presence of the long allele of either the IGF-I or CYP19 polymorphisms was an independent risk factor for death (P = .019 or .026, respectively). Furthermore, the presence of the long allele of both the IGF-I and CYP19 polymorphisms was a stronger predictor for survival (P = .001).ConclusionThe prognosis of metastatic prostate cancer patients is suggested to be influenced by intrinsic genetic factors. The IGF-I (CA) repeat and CYP19 (TTTA) repeat polymorphisms may be novel predictors in prostate cancer patients with bone metastasis at the diagnosis.