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Doctors and investors are getting their first glimpse of the data that compelled Takeda Pharmaceutical to make a $6 billion bet on an experimental pill. The drug, which it acquired from Boston biotech Nimbus Therapeutics last month, blocks a key lever in the immune system that Takeda believes has the potential to treat numerous autoimmune and inflammatory diseases.

In an intermediate-stage clinical study of 259 people with moderate-to-severe plaque psoriasis, the highest dose of the daily pill completely cleared itchy and painful patches of skin in one-third of the patients after 12 weeks. “We’re offering the potential for a functional cure,” Andrew Plump, Takeda’s president of research and development, said in an interview.

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The results were impressive for other patients too. Nearly half of the patients on the high dose had 90 percent of their psoriasis cleared. And two-thirds of the patients had 75 percent of their psoriasis cleared — compared with 6 percent of patients who received a placebo. Takeda announced the results Saturday morning and will present them at a medical conference for dermatologists in New Orleans over the weekend.

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