Table 1.

Patient characteristics and clinical features

VariablePatientsDeathsMST (mo)Log-rank PHR (95% CI)
n = 568 (%)n = 311
Age (y)0.690
    ≤60285 (50.2)15524.71.00
    >60283 (49.8)15625.01.05 (0.84-1.31)
Sex0.805
    Male434 (76.4)24124.71.00
    Female134 (23.6)7027.80.97 (0.74-1.26)
Smoking0.792
    Never201 (35.4)11124.81.00
    Ever367 (64.6)20024.31.03 (0.82-1.30)
Histology0.519
    Adenocarcinoma353 (62.2)19226.21.00
    Squamous cell184 (32.4)9924.00.97 (0.76-1.23)
    Others*31 (5.5)2017.91.28 (0.81-2.03)
Clinical stage<0.001
    I144 (25.4)4660.41.00
    II71 (12.5)2947.61.37 (0.86-2.19)
    III221 (38.9)13319.63.04 (2.17-4.26)
    IV132 (23.2)10313.45.75 (4.03-8.21)
Surgical operation<0.001
    None200 (35.2)15515.31.00
    Yes368 (64.8)15636.80.33 (0.26-0.41)
Chemotherapy or radiotherapy0.102
    None106 (18.7)4733.01.00
    Yes462 (81.3)26423.51.30 (0.95-1.77)
  • *Other carcinomas include large cell, undifferentiated and mixed-cell carcinomas.