Abstract
The aim of our retrospective study was to analyze patterns of subtype specific metastatic spread and to identify the time course of distant metastases. A consecutive series of 490 patients with breast cancer who underwent surgery and postoperative treatment at Semmelweis University, Hungary, and diagnosed between the years 2000 and 2007 was identified from the archives of the 2nd Department of Pathology, Hungary. Molecular subtypes were defined based on the 2011 St. Gallen recommendations. Statistical analysis was performed with SPSS Statistics for Windows, Version 22.0. Distant metastasis free survival (DMFS) was defined as the time elapsed between the first pathological diagnosis of the tumor and the first distant metastasis detection. Distant metastases were detected in 124 patients. Mean time to develop metastasis was 29 months (range 0–127 months). The longest DMFS was observed in the Luminal A (LUMA) subtype (mean 39 months) whereas the shortest was seen in the HER2-positive (HER2+) subtype (mean 21 months; p = 0.012). We confirmed that HER2+ tumors carry a higher risk for distant metastases (42.1%). LUMA-associated metastases were found to be solitary in 59% of cases, whereas HER2+ tumors showed multiple metastases in 79.2% of cases. LUMA tumors showed a preference for bone-only metastasis as compared with HER2+ and triple negative breast cancer (TNBC) cases, which exhibited a higher rate of brain metastasis. The most frequent second metastatic sites of hormone receptor (HR) positive tumors were the lung and liver, whereas the brain was the most affected organ in HR-negative (HR−) cases. Tumor subtypes differ in DMFS and in pattern of distant metastases. HER2+ tumors featured the most aggressive clinical course. Further identification of subtype-specific factors influencing prognosis might have an impact on clinical care and decision-making.
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Acknowledgments
The authors thank Rigóné Káli Elvira for the careful reading of the manuscript and the valuable comments.
Authors’ contributions
AMT, LV, BAM, IAM, JK, and AMSz conceived the study. BAM, IAM, JM, KF, JT, CSz, BSz, and PD carefully selected the patients’ clinical/oncological and pathological data and provided the patients’ follow-up data. LV, AB, and SVK performed data/statistical analysis. All authors were involved in data interpretation and in writing the paper and had final approval of the submitted and published manuscript.
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The authors declare that they have no conflict of interest.
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This work was supported by MKOT 2014-2016, SE-OTKA 2014-2015, KTIA_NAP_13-2014-0021, and OTKA grant no. K116151. AMSz was supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences.
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István Artúr Molnár and Béla Ákos Molnár equally contributed.
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Molnár, I.A., Molnár, B.Á., Vízkeleti, L. et al. Breast carcinoma subtypes show different patterns of metastatic behavior. Virchows Arch 470, 275–283 (2017). https://doi.org/10.1007/s00428-017-2065-7
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DOI: https://doi.org/10.1007/s00428-017-2065-7