Surgical Treatment of Malignant Phyllodes Tumor of the Breast with No Distant Metastasis

Clinical Scenario

This protocol addresses patients with a confirmed malignant phyllodes tumour of the breast in whom no distant metastasis has been identified. Phyllodes tumours are biphasic neoplasms comprising both stromal and epithelial components; the malignant subtype accounts for roughly 20–30% of all cases. In this localised setting, surgical planning is the central clinical priority.

Treatment Goal

The primary objective is achieving a clear surgical resection margin of a defined minimum width. This target governs both the choice of procedure and operative planning, including the handling of deep anatomical structures when proximity is a concern.

Surgical Approach — Partial Overview

Management is surgical. Breast-conserving surgery is an option when adequate margin clearance can be achieved; the relationship of the tumour to underlying structures influences the scope of resection. Where conservation cannot meet the margin requirement, mastectomy becomes the path — and in that scenario, breast reconstruction enters the planning discussion, with timing considered carefully in light of disease behaviour. The complete decision algorithm, margin criteria, reconstruction timing guidance, and further management details are in the full protocol…

Instant Access to Structured Evidence-Based Regimens

References

DOI: 10.1093/bjs/znaf152

PT are biphasic with both stromal and epithelial components and are classified into three groups with the following proportions: benign, 50–70%; borderline, 12–26%; and malignant, 20–30%.
For all PT, BCS can be offered if adequate surgical excision margins can be achieved (evidence/grade IV/B).
For malignant PT, aim for a clear surgical margin of 10 mm (evidence/grade II/A).
Consider including fascia and muscle if the deep margin is close.
Breast reconstruction should be offered to all patients undergoing mastectomy for PT, but, for patients with malignant PT, careful consideration should be given to the timing of reconstruction including the likelihood of early progression (local and distant), operative recovery time, and potential effects on timing of adjuvant therapy (evidence/grade V/B).

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