Table 1.
The demographic data of the patients and the key features of the initial treatment.
| Variable | Frequency (%) | |
|---|---|---|
| Gender | Male | 5 (45.5) |
| Female | 6 (54.5) | |
| Anatomical location of infield of previous EBRT failure | Oropharynx SCC p16 positive |
1 (9.1) |
| Oropharynx SCC p16 negative |
4 (36.4) | |
| Oral cavity SCC |
2 (18.2) | |
| Salivary gland SCC |
1 (9.1) | |
| Lymph node SCC metastasis |
3 (27.3) | |
| Dose at First EBRT course | ≤60 Gy | 4 (36.4) |
| >60 Gy | 7 (63.6) | |
| Chemotherapy | Yes | 8 (72.7) |
| No | 3 (27.3) | |
| Interval between salvage surgery to the start of PO-SABR (days) | ≤30 | 7 (63.6) |
| >30 | 4 (36.4) | |
| EBRT Technique | 3D conformal | 3 (27.3) |
| IMRT | 8 (72.7) | |
Legend: SCC–squamous cell carcinoma; EBRT–external beam radiotherapy.