Abstract
Purpose
Recent studies revealed that metabolic stress influences the outcomes of breast cancer treatment. We sought to evaluate the prognostic effect of type 2 diabetes and find the molecular mechanism of relapses in postoperative HER-2+ breast cancer patients treated with HER-2 targeted therapy.
Materials and methods
We evaluated 190 HER-2+ breast cancer patients (pT1-4N0-2M0) who were treated with surgical resection and trastuzumab (HER-2 targeted therapy) between 2006 and 2015. Survival outcomes and failure patterns were compared between such patients with (n = 12) and without (n = 178) type 2 diabetes.
Results
The median follow-up period was 42.4 months (range 12.0–124.7 months). Twenty-one patients (11.1%) showed relapse (including nine patients with locoregional failure), and three patients (1.6%) died as a result of cancer relapse. One-third of the patients with diabetes experienced relapse (4/12, 33.3%). The 3-year disease-free survival (DFS) and overall survival (OS) rates were 90.7% and 98.6%, respectively. Diabetic patients showed shorter DFS compared with non-diabetic patients (p = 0.006, 74.1% vs. 91.9%). OS was also shorter in diabetic patients compared with non-diabetic patients (p = 0.017, 91.7% vs. 99.1%). Of our interest, the levels of HER-3 and its ligand neuregulin-1 were significantly increased in the tumor specimen in HER-2+ breast cancer patients suffering with type 2 diabetes than that in the euglycemic control group.
Conclusions
Type 2 diabetes was associated with detrimental effects on survival in postoperative HER-2+ breast cancer patients who were treated with trastuzumab. The poor prognostic effect of diabetes in HER-2+ breast cancer patients could be associated with the high levels of HER-3 and neuregulin 1, thus it should be considered and evaluated more.
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Acknowledgements
The biospecimens and data used in this study were provided by the Biobank of Inje University PAIK Hospital (InJeBiobank), a member of Korea Biobank Network.
Funding
This work was supported by a grant from the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI, HI14C1277), the Bio-Synergy Research Project (NRF-2017M3A9C4065956) of the Ministry of Science, ICT and Future Planning and Basic Science Research Program (NRF-2018R1A2B6003878) through the National Research Foundation to J.P.
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Lee, A., Jo, S., Lee, C. et al. Diabetes as a prognostic factor in HER-2 positive breast cancer patients treated with targeted therapy. Breast Cancer 26, 672–680 (2019). https://doi.org/10.1007/s12282-019-00967-2
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DOI: https://doi.org/10.1007/s12282-019-00967-2