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Unique characteristics and failure patterns of metaplastic breast cancer in contrast to invasive ductal carcinoma: a retrospective multicenter case-control study (KROG 13-07).

 Jeong Il Yu  ;  Doo Ho Choi  ;  Seung Jae Huh  ;  Sung Ja Ahn  ;  Ji Shin Lee  ;  Kyung Hwan Shin  ;  Youngmee Kwon  ;  Yong Bae Kim  ;  Chang-Ok Suh  ;  Jin Hee Kim  ;  Jihyoung Cho  ;  In Ah Kim  ;  Jong Hoon Lee  ;  Won Park 
 CLINICAL BREAST CANCER, Vol.15(2) : 105-115, 2015 
Journal Title
Issue Date
Adult ; Aged ; Aged, 80 and over ; Biomarkers, Tumor/analysis ; Breast Neoplasms/mortality ; Breast Neoplasms/pathology* ; Carcinoma, Ductal, Breast/mortality ; Carcinoma, Ductal, Breast/pathology* ; Case-Control Studies ; Female ; Humans ; Immunohistochemistry ; Kaplan-Meier Estimate ; Metaplasia ; Middle Aged ; Neoplasm Recurrence, Local/mortality* ; Prognosis ; Retrospective Studies ; Risk Factors ; Triple Negative Breast Neoplasms/mortality ; Triple Negative Breast Neoplasms/pathology* ; Young Adult
Case-control study ; Invasive ductal carcinoma ; Metaplastic breast cancer ; Pattern of failure ; Prognostic factor
BACKGROUND: This retrospective study was performed to investigate the need for management modification in MBC according to evaluation of characteristics and failure patterns compared with IDC. PATIENTS AND METHODS: We performed this multicenter study taking MBC and randomly assigned IDC cases matched for age (± 3 years), pathologic stage (T and N), locoregional treatment methods (surgery with or without radiation therapy), and period of treatment (± 6 months) that occurred from January 1999 to November 2011 in the 6 institutions of the Korean Radiation Oncology Group. RESULTS: A total of 144 female MBC patients were enrolled. The median follow-up was 51 months (range, 1-186 months). The rates of positivity for estrogen receptor (P < .001), progesterone receptor (P < .001), and HER2 (P = .007) were significantly lower in MBC patients. During follow-up, recurrence developed in 22 (15.3%) MBC and 6 (4.2%) IDC patients (P = .002). The median time to recurrence of MBC and IDC was 15 months and 24 months, respectively. Most instances of recurrence in MBC developed in the triple-negative (TN) subgroup (TN-MBC). In particular, locoregional recurrence developed exclusively in the TN-MBC subgroup. In the TN-MBC subgroup, the number of risk factors (pT2-3, N1-3) was related to significant differences in overall survival (P = .001) and recurrence-free survival (P < .001). CONCLUSION: The MBC patients had a higher rate of TN, poorer differentiation, and a higher recurrence rate than did the IDC patients. Considering the unique characteristics and failure patterns, it is necessary to modify the current management guidelines for MBC.
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1. College of Medicine (의과대학) > Dept. of Radiation Oncology (방사선종양학교실) > 1. Journal Papers
Yonsei Authors
Kim, Yong Bae(김용배) ORCID logo https://orcid.org/0000-0001-7573-6862
Suh, Chang Ok(서창옥)
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