Table 2: Treatment decision and three-dimensional ultrasound measurements in 76 patients 50-55 days after completion of neoadjuvant chemoradiotherapy for rectal cancer.
| Sphincter preserving surgery | Abdominoperineal resection | Watch-and-wait strategy | |
|---|---|---|---|
| Patients n (%) | 44 (58) | 24 (31) | 8 (11) |
| Distance (cm)a | |||
| Mean (SD) | 3.1 (1.3)b | 0.4 (0.5)b | Complete regression |
| Range | (1-6) | (0-1.6) | |
| Length reduction ratio (%) | |||
| Mean (SD) | 63 (18)c | 41 (24)c | 100 |
| Range | (10-100) | (7-67) |
aDistance between the distal tumor edge and the proximal border of the sphincter; bSignificant increase in the distance between the distal tumor edge and the proximal border of the sphincter (p = 0.001); cSignificant increase in length reduction ratio compared sphincter preservation group with abdominal resection and (p = 0.004).