Thanks for the information on centers..
Hi there.
Metaplastic carcinoma is indeed an uncommon type of tumor compared to the usual invasive ductal cancers. If I'm not mistaken, metaplastic carcinoma may behave less invasive and has a more favorable prognosis and course compared to invasive ductal carcinoma. However, the national comprehensive cancer network (NCCN) has lumped metaplastic with the invasive ductal in terms of treatment:
http://www.nccn.org/patients/patient_gls/_english/_breast/contents.asp
The consultations that your doctors are doing with each other or with other specialists are very welcome as this would tailor-fit your treatment. Large specialized centers including Memorial Sloan-Kettering or MD Anderson may have definite protocols for this condition. Regards.