title: Real-time quantitative PCR analysis of amplified DNA on chromosomes 4p15.2 and 6q23-24 from formalin-fixed, paraffin-embedded breast cancer tissues.
abstract: This study was performed to detect amplification of DNA sequences on chromosomes 4p15.2 and 6q23-24, obtained from formalin-fixed, paraffin-embedded, breast-cancer tissues. The prognostic relevance of the amplification was also demonstrated. DNA from formalin-fixed, paraffin-embedded tumor and corresponding normal tissues of 53 patients with breast cancer was extracted and amplified by real-time quantitative PCR technique. Amplification of the DNA sequences on chromosomes 4p15.2 and 6q23-24 was detected in 23 (43%) and 32 (60%) cases, respectively. Thirty-six (68%) cases showed amplification on both or one of the chromosomes. These frequencies are similar to that obtained from fresh samples in our previous study. In addition, amplification of the DNA on chromosomes 4p15.2 and / or 6q23-24 was predominantly observed in tumors with invasive ductal carcinoma. The findings in this study demonstrate that DNA extracted from formalin-fixed, paraffin-embedded breast tumors can be used to determine amplification of DNA sequences on selective chromosomal regions. We also suggest that the amplified DNA on chromosomal regions 4p15.2 and 6q23-24 might be involved in the development and progression of breast cancer.
authors.affiliation: Division of Research, National Cancer Institute, Bangkok, Thailand.
authors.forename: Sunanta
authors.initials: S
authors.lastname: Chariyalertsak
authors.forename: Wichai
authors.initials: W
authors.lastname: Purisa
authors.forename: Phongkitti
authors.initials: P
authors.lastname: Thisuphakorn
authors.forename: Anant
authors.initials: A
authors.lastname: Karalak
authors.forename: Tanett
authors.initials: T
authors.lastname: Pakeetoot
authors.forename: Songsak
authors.initials: S
authors.lastname: Petmitr
mesh_terms: D001943:Breast Neoplasms / Q000235:genetics* / Q000473:pathology; D018270:Carcinoma, Ductal, Breast / Q000235:genetics / Q000556:secondary; D002869:Chromosome Aberrations; D002894:Chromosomes, Human, Pair 4 / Q000235:genetics*; D002896:Chromosomes, Human, Pair 6 / Q000235:genetics*; D004252:DNA Mutational Analysis; D004273:DNA, Neoplasm / Q000235:genetics; D018450:Disease Progression; D005260:Female; D005784:Gene Amplification; D006801:Humans; D008207:Lymphatic Metastasis; D008875:Middle Aged; D016612:Paraffin Embedding; D016133:Polymerase Chain Reaction / Q000379:methods*; D016707:Tissue Fixation
chemical_list: D004273:DNA, Neoplasm