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We used distance\u2010based and branching\u2010tree methods to construct more general tree\u2010like models for NPC carcinogenesis from 170 comparative genomic hybridization (CGH) samples previously published in five smaller studies. Imbalances were classified into \u201coverlap regions,\u201d each containing the most commonly gained or lost band on each chromosome arm as well as adjacent bands that were gained or lost almost as often. The chromosome abnormalities associated with NPC were \u22123p26\u201313 (48.9%), \u221211q22\u201325 (38.1%), \u221216q12\u201324 (38.1%), \u221214q24\u201332 (32.4%), \u221213q21\u201332 (22.3%), \u22129p23\u201321(21.6%), +12p12 (46%), +12q13\u201315 (43.9%), +1q22\u201332 (33.1%), +3q13.1\u201326.2 (30.2%), and +8q22.1\u201324.2 (27.3%). NPC can be classified into two groups, one marked by +12p12 and +8q22.1\u201324.2 and the other by \u22123p26\u201313, \u221211q22\u201325, \u221214q24\u201332, and +1q22\u201332. The tree models predicted \u22123p26\u201313 and +12p12 as early events and +8q22.1\u201324.2 as a late event. The predictions for \u22123p26\u201313 and +8q22.1\u201324.2 were consistent with previous studies. The prediction for +12p12 is being reported for the first time. Many known NPC\u2010related genes on chromosomal regions of these tree models are discussed, some of which may merit additional study. The potential applications of tree models are also discussed. \u00a9 2004 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/gcc.20036","type":"journal-article","created":{"date-parts":[[2004,6,3]],"date-time":"2004-06-03T19:04:01Z","timestamp":1086289441000},"page":"307-315","source":"Crossref","is-referenced-by-count":29,"title":["Construction of tree models for pathogenesis of nasopharyngeal carcinoma"],"prefix":"10.1002","volume":"40","author":[{"given":"Zhongxi","family":"Huang","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard","family":"Desper","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alejandro 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