Long Term Clinical Outcome and Prognostic Factors after Treatment of Patients Diagnosed with Ductal Carcinoma in Situ of Breast

Objectives: The retrospective study evaluated the clinical outcome after treatment of patients diagnosed with ductal carcinoma in situ of breast and reanalyzed the prognostic factors related to recurrence rate and disease free survival(DFS) using long-term follow-up. Material & Methods: Between January 2008 and July 2021, 130 patients previously diagnosed ductal carcinoma in situ underwent surgery. We collected retrospective data characteristic data, radiology data, operative data, pathology data, clinical outcome and time to breast tumor recurrence. Median follow-up time was 51.5 months. Results: The 12-year cumulative incidence of tumor recurrence and re- excision in 130 patients were 6.92%(9 patients) and 12.31%(16 patients). Among 9 patients, 5 patients had locoregional recurrence, 3 patients had distant metastasis recurrence and 1 patient had both. Ki-67(OR, 1.06;95% CI 1.00 – 1.11); p-value = 0.045) was associated with an increase risk of recurrence tumor in multivariable analysis. Simple mastectomy(41.54%) and wide excision (38.46%) were the most surgery in this study. Conclusion: The retrospective study showed the 12-year cumulative incidence of recurrence tumor. Although Ki-67 increased risk of recurrence tumor.