Table 3. Factors associated with change in tumour volume (post CK SRS radiology).
| Post CK SRS tumour volume (n = 257)** | ||||
|---|---|---|---|---|
| Variable | Reduced (n = 202) | Resolve (n = 13) | Stable (n = 42) | p-value |
| Tumour size | ||||
| Micro | 189 (78.42) | 12 (4.98) | 40 (16.6) | 0.325ƿ |
| Macro | 7 (87.5) | 1 (12.5) | 0 (0) | |
| Tumour type | ||||
| Non functioning | 74 (77.89) | 7 (7.37) | 14 (14.74) | 0.399ƿ |
| Functioning | 128 (79.01) | 6 (3.7) | 28 (17.28) | |
| Pre CK GTV# | 7,529.12 (5,069.64–11,142.56) | 5,763.48 (3,144.22–9638.75) | 5,782.94 (4,326.18–7,360.84) | 0.068£ |
| Radiation parameter | ||||
| CI# | 1.31 (1.25–1.38) | 1.32 (1.25–1.4) | 1.29 (1.25–1.34) | 0.475£ |
| nCI# | 1.36 (1.29–1.43) | 1.42 (1.29–1.43) | 1.33 (1.26–1.4) | 0.484£ |
| HI# | 1.25 (1.23–1.28) | 1.23 (1.22–1.28) | 1.25 (1.23–1.27) | 0.553£ |
| C# | 97 (95.23–98.8) | 97.25 (96.2–97.89) | 96.4 (94.83–99.19) | 0.932£ |
#Median (IQR); £Kruskall Wallis; ƿChi-Square test
**21 cases did not provide post SRS MRI
p-value of <0.05 was considered significan
CK SRS: CyberKnife stereotactic radiosurgery; GTV: Gross tumour volume; CI: Conformity index; nCI: New conformity index; HI: Homogeneity index; C: Coverage