| KPS | Karnofsky Performance Score |
| CUP | Cancer of unknown primary |
| OS | Overall survival |
| CVA | Cerebrovascular accident |
| CSF | Cerebrospinal fluid |
| BM-CUP | Brain metastases from cancer of unknown primary |
| WBRT | Whole-brain-radiotherapy |
| OR | Odds ratio |
| CI | Confidence interval |
| SRS | Stereotactic radiosurgery |