Abstract
Purpose
Mucinous carcinoma (MC) is a rare breast cancer with favorable outcome. Unlike typical breast cancer, the current guidelines do not recommend chemotherapy or anti-human epidermal growth factor receptor 2 (HER2) therapy for hormone receptor (HR)-positive MC, regardless of HER2 status. We evaluated the prognostic implication of HER2 status in HR-positive MC.
Methods
We retrospectively reviewed the data of 471 patients with pure MC (stages I–III) who underwent curative surgery. We analyzed 5-year disease-free survival (DFS) and distant metastasis-free survival (DMFS), according to clinicopathological characteristics.
Results
The median follow-up duration was 79.0 months. Overall, the 5-year DFS rate was 95.7% and the 5-year DMFS rate was 96.2%. Nodal status was the only significant factor for DFS (relative risk [RR], 3.40; 95% confidence interval [CI] 3.40–9.67, p = 0.021). Among HR-positive/node-negative patients with tumor size ≥ 3 cm, HER2-positive patients showed significantly worse DFS (RR, 8.76; 95% CI 1.45–52.76, p = 0.018) and DMFS (RR, 11.37; 95% CI 1.37–74.70, p = 0.011). This finding was consistently significant, when combining both “HR-positive/node-negative/tumor size ≥ 3 cm” and “HR-positive/node-positive” MC (n = 125) for DFS (RR, 4.30; 95% CI 1.43–12.97, p = 0.009) and DMFS (RR, 4.93; 95% CI 1.63–14.90, p = 0.005). Intriguingly, within this subgroup, among HER2-positive tumors, whereas 5-year DFS was 60.2% in patients who did not receive trastuzumab, 100% of those who received trastuzumab were disease free (p = 0.053).
Conclusions
In HR-positive, node-negative MC with tumor size ≥ 3 cm, patients with HER2-positive MC showed worse survival, suggesting a potential role of an anti-HER2 strategy in this subgroup.
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Acknowledgment
This study was supported by a grant (2015-510) from the Asan Institute for Life Sciences and a grant (2017-1347) ‘Elimination of Cancer Project Fund’ from Asan Cancer Institute, Asan Medical Center, Seoul, Korea.
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Gwark, Sc., Lee, H.S., Lee, Y. et al. Clinical Implication of HER2 Status in Hormone Receptor-Positive Mucinous Breast Cancer. Ann Surg Oncol 26, 2166–2174 (2019). https://doi.org/10.1245/s10434-019-07332-9
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DOI: https://doi.org/10.1245/s10434-019-07332-9