Hey,
I'm sorry to hear you have been diagnosed with a pt tumour, especially when it's malignant. Mine has been tested as benign and I am freaking out so I couldn't imagine what you would be feeling!
Phyllodes is a type of sarcoma cancer because it is in the tissue not the ducts. There is little information available on pt tumours and I have found that a lot of the information on the net is conflicting and most of it left me confused and anxious. I would advise you to make a list of questions for your surgeon before your appointment. I have found the most useful information from reading blogs on here and asking questions.
I wish you the very best with your surgery and recovery and I hope tp hear how you progress.
Warm wishes
Xx Kristy