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. Author manuscript; available in PMC: 2022 Apr 21.
Published in final edited form as: Arch Pathol Lab Med. 2016 Apr 15;140(11):1250–1258. doi: 10.5858/arpa.2016-0009-OA

Table 1.

Consultation Cases Arranged According to American Society of Clinical Oncology/College of American Pathologists Guidelines’ Fluorescence In Situ Hybridization (FISH) Groups

Group Description of FISH Category No. (%) of Cases

1 Ratio ≥2.0, HER2 average ≥4.0 1328 (17.7)
2 Ratio ≥2.0, HER2 average <4.0 31 (0.4)
3 Ratio <2.0, HER2 average ≥6.0 48 (0.6)
4 Ratio <2.0, HER2 average ≥4.0 and <6.0 345 (4.6)
5 Ratio <2.0, HER2 average <4.0 5774 (76.7)
Total 7526 (100.0)