Survival by cytogenetic risk group for 256 ALL patients. The unfavorable risk group (n = 100), consisting of patients with t(4;11), t(9;22), −7, or +8, had a median survival of 1.2 years, whereas the miscellaneous abnormality group (n = 77) had a median of 3.1 years and the normal group (n = 79) had a median of 2.9 years.