A. Jo Chien, MD

A. Jo Chien, MD, associate clinical professor, Department of Medicine, University of California, San Francisco Helen Diller Family Comprehensive Cancer Center, discusses the use of tucatinib (ONT-380) in the treatment of patients with HER2-positive breast cancer.

A. Jo Chien, MD, associate clinical professor, Department of Medicine, University of California, San Francisco Helen Diller Family Comprehensive Cancer Center, discusses de-escalation strategies for patients with HER2-positive breast cancer.

A. Jo Chien, MD, associate clinical professor, Department of Medicine, University of California, San Francisco Helen Diller Family Comprehensive Cancer Center, discusses treatment duration in HER2-positive breast cancer.