A Randomized, Phase II Study Comparing Trastuzumab and Vinorelbine in Combination with Avelumab or Avelumab and Utomilumab (41BB/CD137 Agonist), In Patients with Her2-Positive
Metastatic Breast Cancer who have Progressed on Prior Trastuzumab and Pertuzumab:
The "AVIATOR” Study