- Must either be currently receiving treatment with, or have a history of having failed to respond to, or tolerate, at least 1 of the following therapies as assessed by treating physician: oral corticosteroids, 6-mercaptopurine (6-MP), azathioprine (AZA), or methotrexate (MTX). a) Have no response to oral corticosteroids within the preceding 18 months; b) Have no response to 6-MP, AZA or MTX within the preceding 5 years