Ballhausen A, Wheler JJ, Karp DD, Piha-Paul SA, et al. Phase I study of everolimus, letrozole, and trastuzumab in patients with hormone
receptor-positive metastatic breast cancer or other solid tumors. Clin Cancer Res 2020 Oct 28. pii: 1078-0432.CCR-20-2878.
PMID: 33115815