Immunovant (IMVT) stock shot to an 18-month high Wednesday on what an analyst called "highly compelling" results for its experimental rheumatoid arthritis treatment. The company tested the drug, IMVT-1402, in patients with difficult-to-treat rheumatoid arthritis, or D2T RA. This means their symptoms have persisted despite multiple treatments. After 16 weeks of treatment with IMVT-1402, 72.7% of patients showed at least…

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