Some searches I did:
Where is phyllodes breast cancer research being done? Duke University and hospital. Dr. Rosenberger is the founder and Principle Investigator of an 11-site multi-center collaborative network of Comprehensive Cancer Centers that research phyllodes tumors. You can always get a second opinion from a cancer center if you wish.
https://surgery.duke.edu/divisions/surgical-oncology/research/research-laboratories/phyllodes-tumor-research-phytr
Science Direct always brings up some of the latest info - they have standards on the quality of research shared, but you’d want to check out specifics on any information you find on the web.
Here’s an August 2024 article that saying EGFR (epidermal growth factor receptor) mutations are a good target for treatment of early phyllodes tumors, using EGFR inhibitors. Also notes that P53 (tp53) is often low in phyllodes tumors, so your pathology report might note that. P53 inhibits cell proliferation.
(Sorry long link)
https://www.sciencedirect.com/science/article/pii/S1936523324001256