China’s medical system could not stop the cancer eating at Guo Shushi’s stomach. It roared back even after Mr. Guo, a 63-year-old real estate developer, endured surgery, chemotherapy and radiation at two hospitals. Then his son-in-law discovered online that — for a price — companies were willing to help critically ill Chinese people seek treatment abroad. Soon Mr. Guo was at the Dana-Farber Cancer Institute in Boston, receiving a new immunotherapy drug, Keytruda, which is not available in China. In April, nearly four months later, his tumor has shrunk and his weight has gone up. “When I arrived, I could feel how large the gap was,” said Mr. Guo of the difference in care. The cost: about $220,000 — all paid out of pocket. Read more