Association Between the V109G Polymorphism of the P27 Gene and the Risk and Progression of Oral Squamous Cell Carcinoma

Association Between the V109G Polymorphism of the P27 Gene and the Risk and Progression of Oral Squamous Cell Carcinoma

3996 Vol. 10, 3996–4002, June 15, 2004 Clinical Cancer Research Featured Article Association between the V109G Polymorphism of the p27 Gene and the Risk and Progression of Oral Squamous Cell Carcinoma Guojun Li,1 Erich M. Sturgis,1,2 Li-E. Wang,1 cavity cancer and possibly tumor progression. Larger stud- Robert M. Chamberlain,1 Margaret R. Spitz,1 ies with oral squamous cell carcinoma are needed to verify Adel K. El-Naggar,3 Waun K. Hong,4 and these findings. Qingyi Wei1 INTRODUCTION Departments of 1Epidemiology, 2Head and Neck Surgery, 3Pathology, and 4Thoracic and Head and Neck Medical Oncology, The University Squamous cell carcinoma of the head and neck (SCCHN), of Texas M. D. Anderson Cancer Center, Houston, Texas which includes cancers of the oral cavity, pharynx, and larynx, is a common malignancy with an estimated number of Ͼ500,000 new cases worldwide (1, 2). In the United States, ABSTRACT approximately 37,200 new SCCHN cases and 11,000 SCCHN Purpose: Abnormalities in p27 may alter cell cycle delay deaths occurred in 2003 (3). Survival rates vary depending on required for DNA repair after exposure to carcinogens. A tobacco and alcohol consumption, age, sex, ethnic background, coding exon 1 polymorphism at codon 109 (T3G) in p27 and geographic area (3). Many factors contribute to SCCHN, was identified and thought to have an effect on the functions including tobacco smoking (4, 5), alcohol use (5, 6), viral of its protein. We hypothesized that this p27 T109G poly- infection (7, 8), and genetic factors (8). Although smoking and morphism is associated with squamous cell carcinoma of the alcohol use play a major role in the etiology of SCCHN, only a head and neck (SCCHN) risk. fraction of smokers and drinkers develop SCCHN, suggesting Experimental Design: We tested this hypothesis in a that there is inter-individual variation in genetic susceptibility to hospital-based case-control study of 713 patients newly di- SCCHN in the general population. Identification of genetic agnosed with SCCHN and 1224 cancer-free controls fre- factors that modulate the risk of SCCHN could be of great value -quency matched to the cases by age (؎5 years), sex, and in identifying high-risk subgroups that could benefit from pri smoking status. All subjects were non-Hispanic whites. We mary prevention programs and management of predictable pa- genotyped for this p27 variant using genomic DNA from tient outcome. each subject. Although no major susceptibility genes for SCCHN have Results: Compared with the p27 109VV variant, the p27 been identified, gains and losses at several loci and altered 109GG variant was associated with a nonsignificantly in- expression of p53 and DNA repair genes suggest the involve- ment of altered oncogenes and tumor suppressor genes in %95 ;1.29 ؍ (creased risk of SCCHN [crude odds ratio (OR SCCHN tumorigenesis (9, 10). Alterations in genes involved in ;1.20 ؍ adjusted OR ;1.90–0.88 ؍ (confidence interval (CI -but the risk was statistically signifi- cell cycle control frequently result in deregulated cellular pro ,[1.77–0.81 ؍ CI 95% liferation; specifically, genes associated with the regulation of –1.00 ؍ CI %95 ,1.55 ؍ cant among men (adjusted OR ؍ CI %95 ,1.68 ؍ current alcohol users (adjusted OR ,(2.42 the G1 checkpoint in the cell cycle are frequently altered in 1.01–2.82), and patients with oral cavity cancer (adjusted cancer cells (11). For instance, cyclins and cyclin-dependent -The p27 109GG variant kinases (CDKs) form protein complexes to modulate cell pro .(3.04–1.03 ؍ CI %95 ,1.77 ؍ OR was also associated with oral tumor overall stage, suggesting liferation through the cell cycle control, and CDK inhibitors that it may play a role in tumor progression. inhibit kinase activities of the complexes and block transitions Conclusions: Our findings suggest that the p27 109GG of the cell cycle (12–14). Therefore, abnormalities in genes that variant genotype may not play a major role in the etiology of regulate cell proliferation may alter cell-cycle control and DNA SCCHN but may be associated with an increased risk in repair activities in response to DNA damage, especially p53 at-risk subgroups or subsets of SCCHN, particularly oral response to DNA damage (15, 16). In oral cancer, the functions of p53, p27, p16, and cyclin D1 are often altered through mutation, amplification, or deactivation (17). Therefore, indi- viduals carrying polymorphic CDK inhibitors that may affect its Received 1/15/04; revised 3/11/04; accepted 3/25/04. protein function are likely more susceptible to SCCHN devel- Grant support: NIH Grants ES 11740 (to Q. Wei) and in part by NIH opment. Grants CA 86390 and CA 97007 (to M. Spitz and W. Hong), CA 16672 The p27, a CDK inhibitor belonging to the ciprofloxacin/ and ES 07784 (to The University of Texas M. D. Anderson Cancer kinase inhibitor proteins family, which includes p21 (18) and Center), and CA 57730 (to R. Chamberlain). The costs of publication of this article were defrayed in part by the p57 (19, 20), is a putative tumor suppressor (21, 22). The p27 payment of page charges. This article must therefore be hereby marked maps to chromosome 12p13 and encodes for a 27-kDa protein advertisement in accordance with 18 U.S.C. Section 1734 solely to (23, 24). The p27, p21, and p57 share common sequence motifs indicate this fact. that mediate interaction between the CDK inhibitor and cyclin- Requests for reprints: Q. Wei, Department of Epidemiology, Unit 189, The University of Texas M. D. Anderson Cancer Center, 1515 Hol- CDK complexes (10, 25, 26). Because the expression level of combe Boulevard, Houston, TX 77030. Phone: (713) 792-3020; Fax: p27 correlates positively with cell differentiation (27), it is (713) 563-0999; E-mail: [email protected]. speculated that p27 is involved in pathways regulated by both Downloaded from clincancerres.aacrjournals.org on September 23, 2021. © 2004 American Association for Cancer Research. Clinical Cancer Research 3997 mitogenic and antiproliferative extrinsic signals (25) and that our frequency matching purpose. The overall response rate loss of its function contributes to tumorigenesis. The expression among this hospital control group was approximately 75%. The of p27 is frequently reduced in cancers, including gastric, breast, other control population was genetically unrelated and were prostate, and non-small cell lung cancers (16), but p27 is rarely M. D. Anderson hospital visitors (n ϭ 622) accompanying other mutated in human malignancies (28). Previous studies indicate cancer patients to our outpatient clinics. We had first surveyed that reduced p27 expression correlates with poor clinical out- the potential control subjects with a short questionnaire to come (29, 30), invasiveness (31), poor prognosis (30, 32–38), determine their willingness to participate in research studies and tumor grade (32, 39, 40), and progression (32, 41) in human to obtain information about their smoking behavior and demo- malignancies. However, it is unknown whether genetic variants graphic factors. The response rate for this community control in p27 play a role in the carcinogenesis or progression of group was approximately 80%. SCCHN. We frequency matched the controls to the cases by age (Ϯ5 A total of 21 single nucleotide polymorphisms of p27 have years), sex, and smoking status (i.e., current, former, and never). been described (GenBank entry no. AF480891). Of these 21 The purpose of frequency matching was to minimize confound- single nucleotide polymorphisms, 11 have low allele frequency ing to evaluate the main effect of the p27 polymorphism. We (Ͻ5%) and 9 occur within the noncoding regions of p27. Only interviewed each eligible subject to obtain data on age, sex, one single nucleotide polymorphism (T3G) at codon 109 ethnicity, smoking status, and alcohol consumption (before the causes an amino acid substitution of glycine for valine. This p27 disease diagnosis for the cases and at the time of the interview V109G polymorphism may have an effect on p27 degradation in for the controls). Subjects who had smoked Ͼ100 cigarettes in vivo (42) and appears to be associated with the risk of prostate their lifetimes were categorized as ever smokers, and others carcinoma (42), particularly advanced prostate carcinoma (43). were never smokers. Ever smokers who had quit smoking Ͼ1 Because no reports have been published on an association year previously were categorized as former smokers, and the between the p27 V109G polymorphism and the risk of SCCHN other smokers were categorized as current smokers. Similarly, thus far, we hypothesized that the p27 V109G polymorphism subjects who had drunk alcoholic beverages at least once a week may contribute to the risk of SCCHN. In this study, we tested for Ͼ1 year previously were categorized as ever drinkers, and our hypothesis in a large, hospital-based case-control study of others were never drinkers. Ever drinkers who had quit drinking patients with incident SCCHN and cancer-free controls fre- Ͼ1 year previously were categorized as former drinkers, and the quency matched by age, sex, and smoking status. other drinkers were categorized as current drinkers. After the subjects provided their informed consent, each subject donated 30 ml of blood collected into heparinized tubes. MATERIALS AND METHODS The research protocol was approved by the M. D. Anderson Study Subjects. Between May 1995 and October 2003, Cancer Center and Kelsey-Seybold institutional review boards. 1043 patients with histologically confirmed SCCHN were re- PCR Restriction Fragment Length Polymorphism Anal- cruited at our Head and Neck Surgery Clinic. The overall stage ysis. We extracted genomic DNA from the buffy-coat fraction of SCCHN is defined from I to IV as follows (American Joint of the blood samples by using a Qiagen DNA blood mini kit Committee for Cancer Staging and End-Results reporting, (Qiagen Inc., Valencia, CA) according to the manufacturer’s 1992): overall stage I (T1N0M0), overall stage II (T2N0M0), instructions.

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