title: Novel susceptibility loci for second primary tumors/recurrence in head and neck cancer patients: large-scale evaluation of genetic variants.
abstract: This study was aimed to identify novel susceptibility variants for second primary tumor (SPT) or recurrence in curatively treated early-stage head and neck squamous cell carcinoma (HNSCC) patients. We constructed a custom chip containing a comprehensive panel of 9,645 chromosomal and mitochondrial single nucleotide polymorphisms (SNP) representing 998 cancer-related genes selected by a systematic prioritization schema. Using this chip, we genotyped 150 early-stage HNSCC patients with and 300 matched patients without SPT/recurrence from a prospectively conducted randomized trial and assessed the association of these SNPs with risk of SPT/recurrence. Individually, six chromosomal SNPs and seven mitochondrial SNPs were significantly associated with risk of SPT/recurrence after adjustment for multiple comparisons. A strong gene-dosage effect was observed when these SNPs were combined, as evidenced by a progressively increasing SPT/recurrence risk as the number of unfavorable genotypes increased (P for trend < 1.00 x 10(-20)). Several polygenic analyses suggest an important role of interconnected functional network and gene-gene interaction in modulating SPT/recurrence. Furthermore, incorporation of these genetic markers into a multivariate model improved significantly the discriminatory ability over the models containing only clinical and epidemiologic variables. This is the first large-scale systematic evaluation of germ-line genetic variants for their roles in HNSCC SPT/recurrence. The study identified several promising susceptibility loci and showed the cumulative effect of multiple risk loci in HNSCC SPT/recurrence. Furthermore, this study underscores the importance of incorporating germ-line genetic variation data with clinical and risk factor data in constructing prediction models for clinical outcomes.
authors: Department of Epidemiology, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA.
authors: Xifeng
authors: X
authors: Wu
authors: Margaret R
authors: MR
authors: Spitz
authors: J Jack
authors: JJ
authors: Lee
authors: Scott M
authors: SM
authors: Lippman
authors: Yuanqing
authors: Y
authors: Ye
authors: Hushan
authors: H
authors: Yang
authors: Fadlo R
authors: FR
authors: Khuri
authors: Edward
authors: E
authors: Kim
authors: Jian
authors: J
authors: Gu
authors: Reuben
authors: R
authors: Lotan
authors: Waun K
authors: WK
authors: Hong
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000175:diagnosis* / Q000235:genetics*; D016022:Case-Control Studies; D005260:Female; D020022:Genetic Predisposition to Disease; D014644:Genetic Variation; D005838:Genotype; D006258:Head and Neck Neoplasms / Q000175:diagnosis* / Q000235:genetics*; D006801:Humans; D008297:Male; D016609:Neoplasms, Second Primary / Q000175:diagnosis* / Q000235:genetics*; D020411:Oligonucleotide Array Sequence Analysis; D020641:Polymorphism, Single Nucleotide; D016032:Randomized Controlled Trials as Topic; D012008:Recurrence; D012307:Risk Factors