Poor outcome with abnormalities of chromosome 13 (CA 13) and hypodiploidy.

Kaplan-Meier plots of OS (left panel) and EFS (right panel) dated from initiation of Total Therapy I, according to the presence or absence of CAs. Superior outcome was noted in the absence of CAs and worst outcome among patients exhibiting hypodiploidy or CA 13; those with other CAs had an intermediate prognosis and their overall survival was not significantly different from that of patients with no CAs. Numbers in parentheses indicate 95% CI.