First, the PALOMA-2 trial 14 demonstrated significantly longer PFS in patients with HR + /HER2 − advanced BC treated with palbociclib in combination with standard ET than in those receiving ET, whilst the PALOMA-3 trial 15 showed a longer OS, that did not achieve significance, amongst patients with HR + /HER2 − advanced BC treated with palbociclib-fulvestrant compared to those receiving placebo-fulvestrant.
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Patterns of treatment and outcomes of patients with metastatic HER2-low breast cancer treated with CDK4/6 inhibitors and hormone therapy.
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