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Molecular Cytogenetic Characterization of Head and Neck Squamous Cell Carcinoma and Refinement of 3q Amplification¹

Laboratory of Epithelial Cancer Biology [B. S., S. K. G.], Head and Neck Service [B. S., P. G. S., A. R. S., J. P. S.], Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York 10021; Laboratory of Cancer Biology, Rockefeller University, New York, New York 10021 [A. S.]; and Department of Pediatrics, Baylor College of Medicine, Houston, Texas 77030-2399 [P. H. R.]

We applied a combination of molecular cytogenetic methods, including comparative genomic hybridization (CGH), spectral karyotyping (SKY), and fluorescence in situ hybridization, to characterize the genetic aberrations in a panel of 11 cell lines derived from head and neck squamous cell carcinoma and 1 cell line derived from premalignant oral epithelium. CGH identified recurrent chromosomal losses at 1p, 3p, 4, 8p, 10p, and 18q; gains at 3q, 5p, 8q, 9q, and 14q; and high-level amplification at 3q13, 3q25-q26, 5q22-q23, 7q21, 8q24, 11q13-q14, 12p13, 14q24, and 20q13.1. Several recurrent translocations including t(1;13)(q10;q10), t(13;13)(q10;q10), t(14;14)(q10;q10), i(8)(q10), and i(9)(q10) and breakpoint clusters at 1p11, 1q21, 3p11, 5q11, 5q13, 6q23, 8p11, 8q11, 9p13, 9q13, 10q11, 11q13, 13q10, 14q10, and 15q10 were identified by SKY. There was a good correlation between the number of aberrations identified by CGH and SKY (r = 0.69), and the analyses were both confirmatory and complementary in their assessment of genetic aberrations. Amplification at 3q26-q27 was identified in 42% of cases. Although SKY defined the derivation of 3q gain, the precise breakpoint remained unassigned. Positional cloning efforts directed at the amplified region at 3q26-q27 identified three highly overlapping nonchimeric yeast artificial chromosome clones containing the apex of amplification. The use of these yeast artificial chromosome clones as a probe for fluorescence in situ hybridization analysis allowed a detailed characterization and quantification of the 3q amplification and refinement of unassigned SKY breakpoints.

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