| HS | hydrogel spacer |
| EBRT | external-beam radiation therapy |
| DPR | distance between prostate and rectum |
| mDPR | median distance at midpoint between the prostate and rectum |
| IMRT | intensity-modulated radiation therapy |
| RV100 | rectal volume receiving 100% of prescribed dose |
| V60 Gy/V70 Gy | rectal volume receiving ≥60 or ≥70 Gy |
| D90 | dose received by 90% of the target volume |
| HT | hormonal therapy |
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