A child cancer patient waits to receive medical treatment at a cancer treating center in Sanaa, Yemen, on Feb. 4, 2020, the World Cancer Day. A WHO report in February 2019 estimated that number of cancer patients in Yemen reaches approximately 35,000. (Photo by Mohammed Mohammed/Xinhua)

A boy cancer patient lies in a bed as he receives medical treatment at a cancer treating center in Sanaa, Yemen, on Feb. 4, 2020, the World Cancer Day. A WHO report in February 2019 estimated that number of cancer patients in Yemen reaches approximately 35,000. (Photo by Mohammed Mohammed/Xinhua)

A boy cancer patient lies in a bed as he receives medical treatment at a cancer treating center in Sanaa, Yemen, on Feb. 4, 2020, the World Cancer Day. A WHO report in February 2019 estimated that number of cancer patients in Yemen reaches approximately 35,000. (Photo by Mohammed Mohammed/Xinhua)