Recently Yagi et. al utilized the students t-test to isolate a gene expression profile which apparently correlated with prognosis (no remission or relapse in less than 1 year vs. complete response for more than 3 years). 13 When an additional 36 cases were added, hierarchical clustering separated the cases into good prognosis and poor prognosis groups. Utilizing HG-U95 to HG-U133 Best Match table available on the Affymetrix website, HG-U133 probe sets were identified for the 35 genes listed in Table 2 of Yagi et.al.. When applied to the 98 cases of our dataset with adequate time to follow-up, resulting clusters did not correlate with prognosis and resulting Kaplan-Meier curves were not different.