Figure 4

Tumor shrinkage rates after STZ administration. (A) The maximum shrinkage rate of the target lesion in each STZ-treated patient with positive and negative MGMT expression. (B) The maximum shrinkage effect as judged by RECIST criteria in patients with positive and negative MGMT expression. Maximum shrinkage rate (%) = [(sum of tumor diameters at maximum reduction − baseline diameters)/baseline diameters] × 100 for SD or PR patients. Maximum shrinkage rate (%) = [(sum of tumor diameters at maximum increase − baseline diameters)/baseline diameters] × 100 for PD patients. Statistical significance was determined by Pearson's chi-square test.