Table 1 Histomorphological features of solitary fibrous tumors of the pleura
Characteristics | All (n = 78) | Adverse outcome (n = 9) | Favorable outcome (n = 69) | p-value* |
|---|---|---|---|---|
Atypical location (parietal), n (%) | 15 (19.2) | 1 (12.5) | 14 (20.3) | 0.5 |
Tumor size, median (IQR) | 8.2 (4.05–14.0) | 17.0 (9.1–21.5) | 6.3 (3.9–12.6) | 0.007 |
Tumor size >10 cm, n (%) | 31 (39.7) | 7 (77.8) | 24 (35.3) | 0.019 |
Non-pedunculated, n (%) | 14 (31.8) | 2 (66.7) | 12 (29.3) | 0.2 |
Necrosis, n (%) | 22 (28.6) | 5 (62.5) | 17 (24.6) | 0.039 |
Hemorrhage, n (%) | 17 (22.1) | 3 (37.5) | 14 (20.3) | 0.4 |
Mitotic count, median (IQR) | 1 (1.0–3.75) | 7 (3–15) | 1 (1–3) | 0.005 |
> 4 mitoses / 10 HPF, n (%) | 16 (25) | 5 (71.4) | 11 (19.3) | 0.009 |
Pleomorphism, n (%) | 8 (10.4) | 3 (37.5) | 5 (7.2) | 0.033 |
Hypercellularity | 19 (57.6) | 7 (87.5) | 12 (48) | 0.056 |