In the phase III trial CLEOPATRA, the combination with pertuzumab delayed the median time to development of CNS metastases at the first site of disease progression ( 84 ); in the PHEREXA study, the addition of pertuzumab to trastuzumab and capecitabine showed a trend in PFS benefit ( 85 ); in a single-arm, prospective, phase II study, however, patients with HER2-positive metastatic breast cancer with BMs and CNS progression despite prior radiotherapy received pertuzumab plus high-dose trastuzumab (6 mg/kg weekly), and the CNS-ORR was only 11%, showing a non-significant result ( 67 ).
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CSCO expert consensus on the diagnosis and treatment of breast cancer brain metastasis.
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