P91 Phyllodes Tumours: Looking for Predictive Features from Multidisciplinary Assessments

INTRODUCTION: The breast triple assessment enables rapid evaluation of breast abnormalities. Lesions are assessed via the assessments based on clinical examination, imaging and histological sampling. Fibroepithelial lesions (FELs) are amongst the most common breast lesions of uncertain malignant potential. They encompass a spectrum of entities ranging from benign fibroadenomas (FA) to malignant phyllodes tumours (PT), with contrasting clinical management approaches. Unfortunately, the distinction between various FELs is often difficult, despite recent diagnostic advances. This is especially so between FAs and PTs. Nevertheless, understanding how to prioritise key characteristics of PTs, both radiologically and histologically may ease this challenge. In our opinion, a multidisciplinary approach including radiological input is probably the most helpful in reaching an accurate diagnosis. METHODS: We, retrospectively studied data from breast lesions which were initially diagnosed pre-operatively as R3/B3 FELs, and those with a final diagnosis of PT on excision. 71 suitable cases were identified from 2009 to 2019. Information was extracted from reports made by specialists at the pre-operative and post-excision stages. Statistical analysis will be applied to quantify the significance of features evaluated. RESULTS: Preliminary results suggest diagnoses made by pathologists on pre-operative samples correlated well with the eventual final diagnosis made on post-operative specimens. Adequate sampling appears to be a significant factor in influencing the pre-operative core biopsy diagnosis. CONCLUSION: We anticipate to acquire a comprehensive knowledge of various predictive features of PTs, and the correlation between the key radiological features, thereby allowing accurate pre-operative diagnosis of these interesting and challenging lesions.