Not a Good SignAmong blood-cancer patients, more than 2,000 -- including Nadeem-Baker -- have signed up for free antibody testing as part of a study by the Leukemia & Lymphoma Society, said the national non-profit’s chief scientific officer, Lee Greenberger.“The research is happening as fast as it possibly can, so we understand the magnitude of the problem, and then figure out solutions for how we’re going to protect these patients," he said.Early findings in cancer patients illustrate how dramatically Covid antibody responses vary by individual and by condition, Greenberger said.