Background: The lack of a standard definition of "pure" mucinous carcinoma of the breast has made it difficult to compare data from different studies. This study used the most stringent criteria to define parameters for truly pure lesions.
Methods: Sixty-five patients were identified. The database was used to evaluate patients' demographics, tumor characteristics, and outcomes. Survival curves and predictors of survival were analyzed.
Results: The mean age of presentation was 67 years. The majority (96%) of patients presented with early-stage disease. The 5- and 10-year overall survival rates were 93.6% and 72.8%, respectively. The number of involved axillary lymph nodes was the only significant predictor of death (P = 0.02).
Conclusions: Pure mucinous carcinoma of the breast has a favorable prognosis. Tumor size does not appear to impact survival, perhaps because the volume of mucin overestimates tumor burden. The number of involved axillary lymph nodes was the only significant predictor of death from disease.
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