title: Genomic-wide cDNA microarray screening to correlate gene expression profile with chemoresistance in patients with advanced lung cancer.
abstract: We conducted a study using cDNA microarray analysis to determine whether expression levels of genes in tumors were correlated with tumor response to chemotherapy. Between September 2000 and December 2001, 47 patients were registered in the study. Eighteen patients had small cell lung cancer (SCLC), and others had non-small cell lung cancer (NSCLC). All patients except three received platinum-based chemotherapy. Sixteen of the 18 patients with SCLC (89%) and 13 of the 29 patients with NSCLC (45%) responded to chemotherapy, respectively. Transbroncheal biopsy specimens of tumors were obtained before chemotherapy. The expression levels of 1176 genes in tumor specimens were analyzed using the Atlas Human Cancer 1.2 Array. When we analyzed the data for correlations between gene expression levels and tumor response to chemotherapy, there was a significant increase in the expression of nine genes in non-responders compared with responders to chemotherapy (p< 0.01). Multivariate regression analysis revealed that allogenic inflammatory factor, HLA-DR antigen associated invariant subunit and MHC class II HLA-DR-beta precursor were independent chemo-resistant factors (p<0.0001). When we analyzed the differences in gene expression levels between patients with SCLC and NSCLC, expression levels of one or more resistant genes were increased in comparison with the mean expression of control house keeping genes in five of 18 SCLC patients and 19 of 29 NSCLC patients, respectively (p=0.012). In conclusion, some chemo-resistant genes were detected in the tumor tissue of lung cancer patients using cDNA microarray analysis. A prospective study is required to confirm whether expression levels of these genes reflect chemosensitivity.
authors.affiliation: Department of Thoracic Oncology, Laboratory for Molecular Diagnostics and Pathology, Kanagawa Cancer Center, Nakao 1-1-2, Asahi-ku, Yokohama 241-0815, Japan. foshita@kcch.jp
authors.forename: Fumihiro
authors.initials: F
authors.lastname: Oshita
authors.forename: Mizuki
authors.initials: M
authors.lastname: Ikehara
authors.forename: Akiko
authors.initials: A
authors.lastname: Sekiyama
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Hamanaka
authors.forename: Haruhiro
authors.initials: H
authors.lastname: Saito
authors.forename: Kouzo
authors.initials: K
authors.lastname: Yamada
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Noda
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Kameda
authors.forename: Yohei
authors.initials: Y
authors.lastname: Miyagi
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000970:Antineoplastic Agents / Q000627:therapeutic use; D002289:Carcinoma, Non-Small-Cell Lung / Q000188:drug therapy / Q000235:genetics* / Q000473:pathology; D018288:Carcinoma, Small Cell / Q000188:drug therapy / Q000235:genetics* / Q000473:pathology; D019008:Drug Resistance, Neoplasm / Q000235:genetics*; D005260:Female; D020869:Gene Expression Profiling / Q000379:methods; D006801:Humans; D008175:Lung Neoplasms / Q000188:drug therapy / Q000235:genetics* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods
chemical_list: D000970:Antineoplastic Agents