Background. Cystosarcoma phyllodes (CP) is an uncommon fibroepithelial breast neoplasm that rarely involves the central nervous system (CNS).
The authors encountered two patients with CNS metastases and reviewed the literature to identify reports of CP affecting the nervous system. Patients must have been reported in sufficient detail to characterize clinical course, extent of tumor burden, and histologic type of the primary tumor and metastasis to be included in the study.
Results. Eleven cases were identified from the literature, but only six were presented in sufficient detail for analysis. Including the current patients, the mean age of patients with CP metastases was 52 years. The time between initial diagnosis and CNS involvement was 5 years. Parenchymal brain metastases respond poorly to treatment, with a mean survival of 29 days, whereas survival is significantly longer with CNS involvement secondary to epidural extension of tumor from adjacent bony structures. Local recurrence or widespread metastases nearly always were present at the time of CNS involvement.
Conclusions. Brain metastases from CP are refractory to therapy and carry a dismal prognosis. Patients with CP and brain metastases should undergo brain biopsy to exclude metastases from associated epithelial breast tumors, which have significantly better prognoses. Patients with compressive lesions arising from bone have a better prognosis and may benefit from aggressive management. Cancer 1993; 72126-30.