Fig. 2

Box plots of median and interquartile range (IQR) Ki67 index. a Hemangioma (median = 0.50%; IQR = 0–2.80%) versus hemangiosarcoma (HSA) (median = 34.85%; IQR = 23.88–42.33%). b Hemangioma versus well-differentiated HSAs (median = 24.60%; IQR = 15.45–39.35%) versus moderately differentiated HSAs (median = 35.60%; IQR = 26.50–43.10%). c Stage I HSAs (median = 31.40%; IQR = 21.73–50.03%) versus stage II HSAs (median = 35.60%; IQR = 27.90–42.10%). d HSA size ≤5 cm (median = 34.20%; IQR = 20.58–42.93%) versus HSA > 5 cm (median = 34.85%; IQR = 32.45–38.75%). Mann-Whitney U test a, Mann-Whitney pairwise comparisons (b) and Student t test (c, d) were applied for statistical analysis