An article in Tech Review covers a new screening approach that the Broad is trying out to screen drugs that affect leukemic stem cells. Instead of just screening the cells, they've added surrounding, or stromal, cells to the mix. "Cancer cells don't exist in isolation," says Kimberly Hartwell, a research fellow at Brigham and Women's Hospital, who helped lead the project. In tissues, these cells "may hijack the support system -- what we call the stromal cells."