Prevalence for ITP is 3.3 per 100,000 people. In
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Now if Leronlimab were prescribed for it 100%, that would turn out to be 10,874 patients with an injection weekly, or every 2 or 3 or 4 weeks depending on severity of the disease and how well Leronlimab worked.
A normal platelet count is between 150,000 and 400,000. Provided it got patients platelet levels greater than 150,000, leronlimab would be considered effective.
So although it may be considered "Rare", even this rare disease could turn out to be very profitable and worth pursuing if it proves effective in early trials.