Prognostic Value of HER2 to CEP17 Ratio on Fluorescence In Situ Hybridization Ratio in Patients with Nonmetastatic HER2-Positive Inflammatory and Noninflammatory Breast Cancer Treated with Neoadjuvant Chemotherapy with or without Trastuzumab.

CONCLUSION: HER2 FISH ratio showed prognostic value among patients with HER2+ non-IBC but not HER2+ IBC treated with neoadjuvant chemotherapy. This disparity may be due to the underlying aggressive nature of IBC.
IMPLICATIONS FOR PRACTICE: The findings of this study indicate that the HER2 to fluorescence in situ hybridization ratio as a continuous variable has promise as a predictor of pathologic complete response to neoadjuvant chemotherapy in patients with HER2-positive (HER2+) noninflammatory breast cancer (non-IBC) regardless of the results on HER2 immunohistochemical testing. In the future, some patients with HER2+ non-IBC and a high HER2 FISH ratio might even be offered personalized treatment options, such as nonsurgical treatment.
PMID: 32003919 [PubMed - as supplied by publisher]

Source: The Oncologist - January 30, 2020 Category: Cancer & Oncology Authors: Kogawa T, Fujii T, Wu J, Harano K, Fouad TM, Liu DD, Shen Y, Masuda H, Krishnamurthy S, Chavez-MacGregor M, Lim B, Murthy RK, Valero V, Tripathy D, Ueno NT Tags: Oncologist Source Type: research