RUTGERS (US) — The effect prolonged chemotherapy has on the development of new brain cells and rhythms may be the cause for the fog-like condition known as “chemo-brain.”It’s not unusual for cancer patients being treated with chemotherapy to complain about not being able to think clearly, connect thoughts, or concentrate on daily tasks. Chemotherapy-induced cognitive impairment (chemo-brain) is common, but the scientific cause has been difficult to pinpoint.