FDA approved another rituximab biosimilar, rituximab-arrx (Riabni) (from Amgen), for use w/ MTX in active RA. Riabni is not currently approved for B-cell NHL, B-cell leukemia, MPA, or GPA. or pemphigus vulgaris (RTX is an orphan drug) https://t.co/Htk0xBx63X https://t.co/ep1L3YO9hl