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SAN FRANCISCO — Not many investors had pegged the long-stagnant immunotherapy developer NantKwest as one of the big stock winners of this week.

But on Monday, the first day of the J.P. Morgan Healthcare Conference, the stock soared 91% after the company’s founder and CEO, Dr. Patrick Soon-Shiong, gave an unusual television interview. With characteristic showmanship, the biotech billionaire announced that one patient with pancreatic cancer saw a complete disease response after receiving five infusions of a treatment his companies are developing.

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