Table 3: Radiologic outcomes broken down by EBT, 3DRT, and IMRT groups with statistical comparison. EBT: endorectal brachytherapy; 3DRT: 3D conformal radiotherapy; IMRT: intensity-modulated radiotherapy; RT: radiotherapy; CR: complete response; PR: partial response; SD: stable disease; PD: progressive disease; LN: lymph nodes.

Radiologic outcomeEBT 3DRT IMRT

Post-RT tumor volume (median (range) cm3)1.0 (0.0–3.6)3.8 (0.7–26.3)0.4 (0.0–5.5)0.16*
Time between RT end and post-RT MRI (mean ± SD days) 0.98
% decrease in tumor volume pre-RT post-RT (median (range))89 (38–100)87 (16–96)93 (66–100)0.78
No. CR (%)1 (14)0 (0)1 (14)0.46
No. PR (%)4 (57)9 (90)6 (86)0.23
No. SD (%)2 (29)1 (10)0 (0)0.26
No. PD (%)0 (0)0 (0)0 (0)1.0
No. with clinically significant mesorectal LN before treatment (%) no. after treatment (%)
No. with clinically significant pelvic LN before treatment (%) no. after treatment (%)

*Medians and ranges are given to better represent the data, but statistical comparison was performed among means.