Table 1: Demographic and clinical characteristics of study patients.

CharacteristicsNumber of patients ()%

Age
 Range (22–73 years)
 Median (52 years)
Gender
 Male3680
 Female920
Histology
 Squamous carcinoma3884.4
 Undifferentiated carcinoma715.6
Pretreatment3577.8
Posttreatment1022.2