GSTM1 and angina pectoris: A total of 3504 patients identified with MI and Hb <10 g/dL wererandomized to a restrictive-strategy group—transfusion permitted but notrequired for Hb <8 g/dL and strongly recommended for Hb <7 g/dL or forrecurrent angina—or to a liberal-strategy group; in the trial, 1 RBC unit wasadministered after randomization and then transfused to maintain Hb >10 g/dLuntil the time of hospital discharge or for 30 days.