PMID- 24075600 OWN - NLM STAT- MEDLINE DCOM- 20140108 LR - 20191210 IS - 1532-8392 (Electronic) IS - 0046-8177 (Linking) VI - 44 IP - 11 DP - 2013 Nov TI - Validation and workflow optimization of human epidermal growth factor receptor 2 testing using INFORM HER2 dual-color in situ hybridization. PG - 2590-6 LID - S0046-8177(13)00292-X [pii] LID - 10.1016/j.humpath.2013.07.005 [doi] AB - Human epidermal growth factor receptor 2 (HER2) status is useful for predicting response to trastuzumab. Fluorescence in situ hybridization (FISH) for HER2 gene amplification is accurate but limited because of cost, the need for fluorescence microscopy, the limited assessment of histology, and the fading of its signal over time. Dual-color in situ hybridization (Dual ISH) is fully automated, is viewable by bright-field microscopy, has a stable signal, and has separate colors for HER2 and chromosome 17 signals. HER2 immunohistochemistry (IHC), FISH, and Dual ISH were performed on 101 breast cancer cases. Sixteen of 17 cases with 3+ HER2 by IHC showed gene amplification by FISH, and 15 showed amplification by Dual ISH. Three of the 2+ IHC cases were either amplified or equivocal by Dual ISH. None of the IHC-negative cases were amplified by either FISH or Dual ISH. Dual ISH agreed with FISH in 93% of cases. Among the 6 discrepancies, 4 were for an equivocal result for 1 test compared with either a positive or a negative result for the other test. The average differences in readings between Dual ISH and FISH in the discrepant cases were only 0.02, with a range of -1.37 to 1.85. Turnaround time for FISH as a send-out test from test ordering to reporting averaged 8.27 workdays, whereas the turnaround time for Dual ISH performed in-house averaged 4.94 workdays (P < .0000001). Our results indicated that automated Dual ISH is a useful method for evaluating HER2 status in a clinical setting. CI - (c) 2013. FAU - Lim, Sung-Jig AU - Lim SJ AD - Department of Pathology, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul 134-727, South Korea. FAU - Cantillep, Alegria AU - Cantillep A FAU - Carpenter, Philip M AU - Carpenter PM LA - eng PT - Comparative Study PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Validation Study DEP - 20130925 PL - United States TA - Hum Pathol JT - Human pathology JID - 9421547 RN - 0 (Biomarkers, Tumor) RN - EC 2.7.10.1 (ERBB2 protein, human) RN - EC 2.7.10.1 (Receptor, ErbB-2) SB - IM MH - Biomarkers, Tumor/*metabolism MH - Biopsy MH - Breast Neoplasms/*metabolism/pathology/surgery MH - Carcinoma/*metabolism/pathology/surgery MH - Female MH - Humans MH - Immunohistochemistry MH - In Situ Hybridization/*methods MH - In Situ Hybridization, Fluorescence/methods MH - Prospective Studies MH - Receptor, ErbB-2/*metabolism MH - Retrospective Studies MH - Time Factors OTO - NOTNLM OT - Breast carcinoma OT - CISH OT - Chr17 OT - DNP OT - Dual ISH OT - Dual-color in situ hybridization OT - ER OT - FDA OT - FFPE OT - FISH OT - Fluorescence in situ hybridization OT - GOLDFISH OT - HER2 OT - IHC OT - INFORM HER2 Dual-color in situ hybridization OT - ISH OT - PR OT - SISH OT - TAT OT - Turnaround time OT - United States Food and Drug Administration OT - chromogenic in situ hybridization OT - chromosome 17 centromere OT - dinitrophenyl OT - estrogen receptor OT - fluorescence in situ hybridization OT - formalin-fixed, paraffin-embedded OT - human epidermal growth factor receptor 2 OT - immunohistochemistry OT - in situ hybridization OT - nanogold with enhancement in situ hybridization OT - progesterone receptor OT - silver-enhanced in situ hybridization OT - turnaround time EDAT- 2013/10/01 06:00 MHDA- 2014/01/09 06:00 CRDT- 2013/10/01 06:00 PHST- 2013/04/04 00:00 [received] PHST- 2013/06/29 00:00 [revised] PHST- 2013/07/03 00:00 [accepted] PHST- 2013/10/01 06:00 [entrez] PHST- 2013/10/01 06:00 [pubmed] PHST- 2014/01/09 06:00 [medline] AID - S0046-8177(13)00292-X [pii] AID - 10.1016/j.humpath.2013.07.005 [doi] PST - ppublish SO - Hum Pathol. 2013 Nov;44(11):2590-6. doi: 10.1016/j.humpath.2013.07.005. Epub 2013 Sep 25.