title: Methods for gene expression profiling in clinical trials of adjuvant breast cancer therapy.
abstract: Although endocrine therapy is highly effective in the treatment of endocrine receptor-positive breast cancer, chemotherapy has been shown to provide clinical benefit when added to tamoxifen. However, baseline risk after tamoxifen treatment is so low, especially in patients who are axillary node negative, that significant overtreatment will result if chemotherapy is given to every patient. Robust prognostic and predictive markers need to be developed to identify those at high risk of treatment failure. Although comprehensive gene expression profiling methods do offer promise, they require fresh or frozen tumor samples. To take advantage of existing archived tissue blocks with clinical follow-up collected from finished clinical trials, such as National Surgical Adjuvant Breast and Bowel Project trials B-20 and B-14, technologies that allow interrogation of archived blocks for gene expression profiling need to be realized. Recent developments in gene expression profiling technologies are discussed with their implications in clinical management of endocrine receptor-positive breast cancer.
authors.affiliation: Division of Pathology, National Surgical Adjuvant Breast and Bowel Project Foundation, Four Allegheny Center/5th Floor, East Commons Professional Building, Pittsburgh, PA 15212, USA. soon.paik@nsabp.org
authors.forename: Soonmyung
authors.initials: S
authors.lastname: Paik
mesh_terms: D018931:Antineoplastic Agents, Hormonal / Q000627:therapeutic use*; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000235:genetics*; D017024:Chemotherapy, Adjuvant; D002986:Clinical Trials as Topic; D005260:Female; D005557:Formaldehyde; D020869:Gene Expression Profiling / Q000379:methods*; D006801:Humans; D020411:Oligonucleotide Array Sequence Analysis; D016612:Paraffin Embedding; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016707:Tissue Fixation
chemical_list: D018931:Antineoplastic Agents, Hormonal; D005557:Formaldehyde