In the article by H. Matsumoto et al., entitled “Nitric oxide is an initiator of intercellular signal transduction for stress response after hyperthermia in mutant p53 cells of human glioblastoma,” which appeared in the July 1, 1999 issue of Cancer Research (pp. 3239–3244), the fourth and fifth sentences are incorrect and should read: “The accumulation of inducible nitric oxide synthase was caused by heat treatment of the mp53 cells but not of the wild-type p53 (wtp53) cells. The accumulation of heat shock protein 72 (hsp72) and p53 was observed in nontreated wtp53 cells cocultivated with heated mp53 cells, and the accumulation of these proteins was suppressed by the addition of a specific inducible nitric oxide synthase inhibitor, aminoguanidine, to the medium.”