By Scott Cendrowski
May 2, 2016

Baidu, the dominant search engine in China, is being investigated by government regulators after social media users criticized the quality of medical ads appearing in its searches.

Chinese social media over the weekend gave widespread exposure to the story of Wei Zexi, a young cancer patient whose family pooled together more than $30,000 for his treatments at a government hospital he found through a Baidu search. The hospital marketed an innovative treatment for synovial sarcoma, the rare form of cancer Wei suffered from. Following an unsuccessful treatment and Wei’s death in April, reports spread that the treatment was much less effective than the hospital had advertised.

The Cyberspace Administration of China (CAC) sent investigators to Baidu today, according to China’s official Xinhua news agency

Baidu has endured criticism recently for similar instances in which dubious medical practices were promoted in paid search results. Analysts have estimated around one quarter of its revenues come from medical and health-care advertisers.

For more about cancer research, see this Fortune video:

 

“We deeply regret the death of Zexi,” a Baidu spokeswoman said today, adding that the search engine had launched its own internal investigation of the matter.

Correction: An earlier version of this story attributed health-care revenue estimates to Baidu. The company does not break out revenue sources. Industry analysts have made estimates.

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