Risk factors for lymph node metastasis and the impact of adjuvant chemotherapy on ductal carcinoma in situ with microinvasion: a population-based study
Authors Chen C, Huang S, Huang A, Jia Y, Wang J, Zhang Z, Mao M, Wang L, Zhou J
Received 3 September 2018
Accepted for publication 21 November 2018
Published 13 December 2018 Volume 2018:11 Pages 9071—9080
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 3
Editor who approved publication: Dr Federico Perche
Cong Chen,1,2 Shumin Huang,3 Aihua Huang,2,4 Yunlu Jia,1,2 Ji Wang,1,2 Zeqin Zhang,1,2 Misha Mao,1,2 Linbo Wang,1,2 Jichun Zhou1,2
1Department of Surgical Oncology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China; 2Biomedical Research Center and Key Laboratory of Biotherapy of Zhejiang Province, Hangzhou, China; 3The Children’s Hospital, Zhejiang University School of Medicine, Hangzhou, China; 4Department of Pathology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
Background: Ductal carcinoma in situ with microinvasion (DCISM) represents ~1% of all breast cancer cases. Risk factors for lymph node (LN) metastasis and appropriate adjuvant therapy for DCISM are still widely debated.
Methods: We retrieved DCISM data from the National Cancer Institute’s Surveillance, Epidemiology, and End Results registry database (1998–2013). Chi-squared tests and logistic regression models were applied to investigate the potential risks of LN metastasis. Univariate and multivariate Cox proportional hazards regressions were performed to estimate the prognostic factors of DCISM. Survival outcomes were estimated using the Kaplan–Meier method. A 1:1 propensity score matching was used to minimize potential bias.
Results: Overall, 6,219 patients with DCISM met our inclusion criteria. Younger age and higher grade disease were identified as risk factors for LN metastasis. In the multivariable analysis, LN metastasis and chemotherapy were prognostic factors for worse overall survival and breast cancer-specific survival. Furthermore, propensity score matching and subgroup analysis showed that chemotherapy may not be effective for DCISM patients.
Conclusion: Younger patients with high-grade disease tend to have LN involved in DCISM. Adjuvant chemotherapy might not be necessary for patients with DCISM.
Keywords: SEER database, breast cancer, ductal carcinoma in situ with microinvasion, adjuvant chemotherapy, lymphatic metastasis
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