Primary tumour site in patients with malignant pleural effusion
| Primary tumour site | Salyer14 (n=95) | Chernow1 (n=96) | Johnston13 (n=472) | Sears4 (n=592) | Hsu12 (n=785) | Total (%) |
| Lung | 42 | 32 | 168 | 112 | 410 | 764 (37.5) |
| Breast | 11 | 20 | 70 | 141 | 101 | 343 (16.8) |
| Lymphoma | 11 | – | 75 | 92 | 56 | 234 (11.5) |
| Gastrointestinal | – | 13 | 28 | 32 | 68 | 141 (6.9) |
| Genitourinary | – | 13 | 57 | 51 | 70 | 191 (9.4) |
| Other | 14 | 5 | 26 | 88 | 15 | 148 (7.8) |
| Unknown primary | 17 | 13 | 48 | 76 | 65 | 219 (10.7) |