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Table 1 Histomorphological features of solitary fibrous tumors of the pleura

From: Prognostic value of MIB-1 proliferation index in solitary fibrous tumors of the pleura implemented in a new score – a multicenter study

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
  1. HPF high power field, IQR interquatile range
  2. *Chi-square test or Mann-Whitney U-test as appropriate