Figure 3. Serial imaging and corresponding CTC counts for bladder cancer patients C1 and C2, in relationship to radiation therapy (RT). (A) Axial image from C1’s abdomen/pelvis MRI scans at indicated time points. Red arrow indicates site of recurrence at 1 mo post-RT. (B) Graph of C1’s CTC counts at indicated time points demonstrating upward trend. (C) Axial image from C2’s abdomen/pelvis CT or MRI scans at indicated time points. Blue arrow shows area of MRI enhancement in right pelvis at 1 mo post-RT which resolved at 4 mo post-RT. (D) Graph of C2’s CTC counts at indicated time points demonstrating downward trend.