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Table 1 Clinicopathological features ( N= 578)

From: RARβ2 hypermethylation is associated with poor recurrence-free survival in never-smokers with adenocarcinoma of the lung

Variable Number (%)
Age (years)a 60 ± 11
Tumor size (cm)a 4.1 ± 2.4
Pack-years of smokinga 32 ± 23
Sex  
  Male 456 (79%)
  Female 122 (21%)
Histology  
  Adenoca 249 (43%)
  Squamous 277 (48%)
  Others 52 (9%)
Smoking status  
  Never 151 (26%)
  Former 145 (25%)
  Current 282 (49%)
Pathologic stage  
  I 258 (45%)
  II 192 (33%)
  III 122 (21%)
  IV 6 (1%)
Differentiationb  
  Well 96 (19%)
  Moderate 301 (58%)
  Poorly 113 (22%)
  Undifferentiated 9 (2%)
Adjuvant chemotherapy  
  No 509 (88%)
  Yes 69 (12%)
Adjuvant radiotherapy  
  No 451 (78%)
  Yes 127 (22%)
Neo-adjuvant chemotherapy  
  No 544 (94%)
  Yes 34 (6%)
Neo-adjuvant radiotherapy  
  No 555 (96%)
  Yes 23 (4%)
  1. Adenoca, adenocarcinoma; Squamous, squamous cell carcinoma.
  2. aValues indicate mean ± standard deviation.
  3. bDifferentiation data are missing for 61 patients.