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Phyllodes Tumors of the Breast
Phyllodes tumors (or phylloides tumors) are rare breast tumors that start in the connective (stromal) tissue of the breast, not the ducts or glands (which is where most breast cancers start). Most phyllodes tumors are benign and only a small number are malignant (cancer)
Phyllodes tumors are often divided into 3 groups, based on how they look under a microscope:
- Benign (non-cancerous) tumors account for more than half of all phyllodes tumors. These tumors are the least likely to grow quickly or to spread.
- Borderline tumors have features in between benign and malignant (cancerous) tumors.
- Malignant (cancerous) tumors account for about 1 in 4 phyllodes tumors. These tend to grow the fastest and are the most likely to spread or to come back after treatment.
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Our team is made up of doctors and oncology certified nurses with deep knowledge of cancer care as well as editors and translators with extensive experience in medical writing.
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National Comprehensive Cancer Network. NCCN Clinical Practice Guidelines in Oncology. Breast Cancer. Version 8.2021. Accessed at www.nccn.org/professionals/physician_gls/pdf/breast.pdf on November 2, 2021.
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Last Revised: June 15, 2022
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