Tocilizumab is approved in the U.S. for autoimmune diseases.

“And actually, I'll share a quick story about that drug. It's called tocilizumab, and it was made by a doctor named Kazu Yoshizaki, or discovered by a doctor named Kazu Yoshizaki. And I had heard from a colleague that Kazu had given it to himself before it was given to any other humans to prove that it was safe. ... So, he studied it in Castleman's patients. It got approval for Castleman's in Japan, and then it got repurposed for rheumatoid arthritis here in the U.S., and a number of other autoimmune diseases. So, it's approved in the U.S. for autoimmune diseases.”