M Shaaban1, L Barthelmes2. 1. Breast Unit, North Cumbria University Hospitals, Newtown Road, Carlisle, Cumbria CA2 7HY, UK. Electronic address: dr.mohamed.shaaban@gmail.com. 2. Breast Unit, North Cumbria University Hospitals, Newtown Road, Carlisle, Cumbria CA2 7HY, UK.
Abstract
BACKGROUND: Phyllodes tumours form a small group of fibroepithelial breast lesions (2-3%). They are classified as benign, borderline, or malignant. (1). Benign phyllodes tumours are the largest subgroup of phyllodes tumours (50-80%), (2) A margin of 1 cm has been suggested as standard of care for all groups of phyllodes tumours.3-6 METHODS: We performed a literature review from January 2009 to April 2016 including the non-English literature. We compared studies taking a 1 mm margin, 10 mm margin and studies with focal margin involvement. RESULTS: We included 12 studies with overall 1702 patients. The range of therapeutic margins differed widely between studies. There is no consensus between studies what constitutes a clear or involved margin. There was a high percentage of margin involvement for benign phyllodes tumours (7.6-43.7%). Despite these inconsistencies, the recurrence rate after excision of benign phyllodes tumours was low in most studies (112 recurrences of 1052 benign phyllodes tumours - 11%; range 0-43%). There is no difference of the recurrence rate between studies aiming for a 10 mm margin (7.9%) compared to a 1 mm margin (5.7%) (p 0.124). The recurrence rate increases when there are tumour cells at the margin (12.9%) (p 0.006). CONCLUSION: There is no difference in recurrence rates between a 1 and a 10 mm margin. 1 mm is an acceptable margin for benign phyllodes tumours. The recurrence rate increases if there is focal margin involvement.
BACKGROUND:Phyllodes tumours form a small group of fibroepithelial breast lesions (2-3%). They are classified as benign, borderline, or malignant. (1). Benign phyllodes tumours are the largest subgroup of phyllodes tumours (50-80%), (2) A margin of 1 cm has been suggested as standard of care for all groups of phyllodes tumours.3-6 METHODS: We performed a literature review from January 2009 to April 2016 including the non-English literature. We compared studies taking a 1 mm margin, 10 mm margin and studies with focal margin involvement. RESULTS: We included 12 studies with overall 1702 patients. The range of therapeutic margins differed widely between studies. There is no consensus between studies what constitutes a clear or involved margin. There was a high percentage of margin involvement for benign phyllodes tumours (7.6-43.7%). Despite these inconsistencies, the recurrence rate after excision of benign phyllodes tumours was low in most studies (112 recurrences of 1052 benign phyllodes tumours - 11%; range 0-43%). There is no difference of the recurrence rate between studies aiming for a 10 mm margin (7.9%) compared to a 1 mm margin (5.7%) (p 0.124). The recurrence rate increases when there are tumour cells at the margin (12.9%) (p 0.006). CONCLUSION: There is no difference in recurrence rates between a 1 and a 10 mm margin. 1 mm is an acceptable margin for benign phyllodes tumours. The recurrence rate increases if there is focal margin involvement.
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