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In page Zheng Cao:

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Shortly after her diagnosis of lung cancer in 2009, she met Dr. David Larson, a radiation oncologist at the University of California, San Francisco and at Washington Hospital in Fremont, California, where he treated her with Gamma Knife radiation therapy for several brain tumors.[1] Their doctor-patient relationship turned to friendship and later to a romantic relationship, and they were married in December 2010 in San Francisco. Throughout her four-year illness, Cao was treated three more times for brain lesions, twice with Gamma Knife radiation therapy and once with whole brain radiation therapy.[citation needed]