Gilead Sciences said on Monday it will buy cancer therapy partner Arcellx for an implied equity value of $7.8 billion. Gilead Sciences said on Monday it will buy cancer therapy partner Arcellx for an implied equity value of $7.8 billion, expanding their cell therapy development collaboration that started in 2022. Shares of Arcellx climbed 77.8% to $113.99 while ... [935 chars]