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Table 2 The association between imaging characteristic and KRAS mutation based on an independent sample t test or Mann-Whitney U test

From: Imaging features associated with survival outcomes among colorectal cancer patients with and without KRAS mutation

Imaging variable Negative KRAS mutation Positive KRAS mutation P value
Axial tumor length (ATL) (cm) (n = 69) (n = 46)  
 Median (min-max) 1.9 (1.0–6.4) 2.2 (1.1–7.7) 0.815
 Mean (SD) 2.37 (1.12) 2.35 (1.08) 0.937
Longitudinal tumor length (LTL) (cm) (n = 69) (n = 46)  
 Median (min-max) 6.3 (1.3–15.0) 6.0 (1.28–16.0) 0.564
 Mean (SD) 6.67 (2.90) 6.48 (2.87) 0.723
ATL/LTL (n = 69) (n = 46)  
 Median (min-max) 0.35 (0.12–1.75) 0.38 (0.08–2.19) 0.521
 Mean (SD) 0.42 (0.29) 0.43 (0.31) 0.888
Tumor locations (%) (n = 69) (n = 46) 0.584
 Left side 61 (88.41) 39 (84.78)  
 Right side 8 (11.59) 7 (15.22)  
Tumor gross patterns (%) (n = 69) (n = 46)  
 Polypoid 30 (43.48) 23 (50) 0.568
 Ulcerative 3 (4.35) 1 (2.17) 0.649
 Circumferential wall thickening 42 (60.87) 23 (50) 0.258
Tumor margin (%) (n = 69) (n = 46) 0.390
 Smooth 0 (0.00) 1 (2.17)  
 Lobulate 69 (92.54) 43 (93.48)  
 Infiltrating 5 (7.46) 2 (4.35)  
Tumor enhancement patterns (%) (n = 69) (n = 46) 0.736
 Homogenous 7 (10.14) 4 (8.70)  
 Heterogeneous < 50% 25 (31.88) 12 (26.09)  
 Heterogeneous ≥ 50% 40 (57.97) 30 (65.22)  
T stage (%) (n = 68) (n = 46) 0.955
 2 30 (43.48) 21 (45.65)  
 3 24 (34.78) 16 (34.78)  
 4 15 (21.74) 9 (19.57)