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. 2017 Nov 3;9(11):e1815.
doi: 10.7759/cureus.1815.

Malignant Epithelial Transformation in Phyllodes Tumor: A Population-Based Case Series

Ralph L Widya  1 , Myra F Rodrigues  2 , Pauline T Truong  3 , Peter H Watson  4 , Lorna M Weir  3 , Margaret A Knowling  5 , Elaine S Wai  3
Affiliations

Malignant Epithelial Transformation in Phyllodes Tumor: A Population-Based Case Series

Ralph L Widya et al. Cureus. .

Abstract

Background Phyllodes tumor (PT) of the breast is an uncommon fibroepithelial neoplasm. Malignant epithelial transformation in PT is rare. This study reports clinicopathologic characteristics and outcomes of patients with malignant epithelial transformation in PT. Methods From an institutional database of 183 patients with newly diagnosed PT referred to a Canadian provincial cancer institution between 1999 and 2014, 11 cases of PT with concomitant in situ or invasive carcinoma were identified. Descriptive analysis was performed to document the characteristics, treatment and outcomes of this cohort. Results Prevalence of malignant epithelial transformation in PT was 6.0%. Median (range) age was 54 (35-75) years. Types of carcinoma were ductal carcinoma in situ (DCIS) (n = 6), lobular carcinoma in situ (n = 4), and invasive ductal carcinoma (IDC) (n = 1). Median PT size was 5 (1-15) cm. Three PTs were classified as benign (27%), five as borderline (45%), and three as malignant (27%). Mastectomy was performed in six (55%) and breast conserving surgery in five (45%) patients. Hormonal therapy was used in two cases: one with a 1 cm, grade 2 DCIS, and one with an 11 cm, grade 1 IDC, the latter also receiving radiotherapy. Mean follow-up duration was 54 (6-175) months. None of the cases showed any evidence of disease after treatment at the time of their last follow-up. Conclusion This case series showed a higher prevalence of malignant epithelial transformation in PT than reported in previous literature. Outcomes were favourable despite the presence of either in situ or invasive carcinoma within PT.

Keywords: breast; ductal carcinoma in situ; invasive ductal carcinoma; lobular carcinoma in situ; oncology; pathology; phyllodes tumor; radiation oncology.

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Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Figure 1
Figure 1. Case of invasive ductal carcinoma within a borderline phyllodes tumor.
Mammogram (A) and ultrasound (B) of the right breast showed a large macrolobulated circumscribed solid mass without substantial vascularity. Microcystic spaces and pleomorphic microcalcifications were present within the mass.
Figure 2
Figure 2. Histopathology of invasive ductal carcinoma within a borderline phyllodes tumor.
Low power views (4x) of classical phyllodes tumor component (A) and of low grade invasive component (B).
See this image and copyright information in PMC

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