SAN FRANCISCO (KGO) – There is an update on San Francisco opera singer Zheng Cao in her battle with stage four lung cancer. The drug that was working to keep her alive, isn’t working as well. So, she’s now involved in a clinical trial. She allowed ABC7 to follow her journey, as a woman who never smoked, to raise awareness about the need for lung cancer research.

Cao is thrilled about the news she received from her oncologist, Dr. Heather Wakelee, at Stanford Medical Center. Cao’s blood tests came back in the almost normal range, after the first two weeks on a new anti-cancer drug called XL184 in a clinical trial.