| CI | Confidence Interval |
| HR | Hazard Ratio |
| I2 | I-squared statistic |
| KM | Kaplan–Meier |
| NOS | Newcastle-Ottawa Scale |
| OS | Overall Survival |
| PAB | Primary Angiosarcoma of the Breast |
| PFS | Progression-Free Survival |
| PICO | Population, Intervention, Comparator, Outcome |
| PI3K/AKT/mTOR | Phosphoinositide 3-kinase/Protein Kinase B/Mammalian Target of Rapamcin |
| PRISMA | Preferred Reporting Items for Systematic Reviews and Meta-Analyses |
| PROSPERO | International Prospective Register of Systematic Reviews |
| R0 | Resection with microscopically negative margins |
| RMST | Restricted Mean Survival Time |
| VEGF | Vascular Endothelial Growth Factor |
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