Fig. 3From: Early differentiating between the chemotherapy responders and nonresponders: preliminary results with ultrasonic spectrum analysis of the RF time series in preclinical breast cancer modelsChanges in the tumor volumes in responding and nonresponding tumors. The parameters were shown as the means ± SD. a In responders, fold changes in the tumor volumes of the therapeutic group were significantly smaller than those of the control group on days 6, 8, and 12 after treatment initiation (*P < 0.01, ** P < 0.001), whereas no significant differences were found on days 0, 2 and 4 (P > 0.05). b In nonresponders, no significant differences were found regarding the fold changes in the tumor volumes between the therapeutic and control groups on any day (P > 0.05)Back to article page