Table 1.

The characteristics of the patient population

Training setTest set
SCCADCHealthy controlsSCCADCHealthy controls
No. of patients245227240244227239
Age, y
 Median (range)61 (40–79)60 (26–81)56 (41–70)61 (28–85)60 (26–86)56 (41–70)
Gender
 Female/male11/234110/117119/12113/231117/110119/120
Lifetime smoking history (pack-years)a
 02413719037140184
 0–25603530553332
 >2516155201525423
TNM stage
 I7011174117
 II97278429
 III77678364
 IV122214
T stage
 111331829
 2163154149154
 361306625
 4108109
N stage
 0111124111138
 181267724
 250735464
 32310
  • aThe relationship between the smoking history and IDH1 level (training and test sets: Pearson χ2 test, SCC: P < 0.01; ADC: > 0.05; NSCLC: < 0.01).