Multivariate analysis of death events using variables significant at multivariate analysis
| Variable | RR | 95% CI | p Value |
| Light chain 3-‘stone-like’ structures (high vs low) | 1.64 | 1.3 to 1.9 | <0.0001 |
| Light chain 3-perinulear (high vs low) | 1.61 | 1.2 to 2.1 | <0.0001 |
| Vascular invasion (yes vs no) | 1.72 | 1.2 to 2.4 | 0.0003 |
| Stage (N1,2 vs N0) | 1.65 | 1.3 to 2.0 | 0.0007 |