| Variable | Seronegative | Seropositive | Statistical significance (p value < 0.05) |
| Total number | 212 | 198 |
|
| Percentage | 53.5% | 46.5% |
|
| Median age | 48 years | 36 years | Yes |
| PS ≥ 2 | 44% | 58% |
|
| “B” symptoms | 84% | 91% |
|
| Stage III/IV | 68% | 83% |
|
| High grade histology | 39% | 98% | Yes |
| EN disease | 49% | 71% | Yes |
| LDH increase | 85% | 93% |
|
| Increased B2-M | 62% | 83% | Yes |
| Survival | 42 months | 11 months | Yes |