[Study of Phyllodes Tumor of the Breast in 44 Cases of Resection]

Phyllodes tumor is a rare interstitial and epithelial mixed tumor which constitutes 0.3-0.9% of all breast tumors. It is classified into benign, borderline malignant, and malignant. Differentiating this from fibroadenoma is difficult, however, when diagnosed, complete surgical resection is recommended. Patients and results: Forty-four patients who underwent surgery between April 2009 and April 2020 and were diagnosed with phyllodes tumors and the median observation period was 44 months. The average tumor diameter was 39.2 mm, and the surgical procedures performed were mastectomy in 3 cases, partial resection in 26 cases, and extirpation in 15 cases. The surgical margin was positive in 6 cases. Intra-breast recurrence occurred in 4 cases, of which the initial surgery in 3 cases was extirpation. The pathological diagnosis was malignant in 4 cases, malignant in 15 cases, and benign in 25 cases. Conclusion: In this study, intra-breast recurrence occurred in many cases treated by extirpation, and it was considered that the surgical technique for complete resection such as partial resection should be selected.