Carcinoma of the esophagus in Tamil Nadu (South India): 16-year trends from a tertiary center.
BACKGROUND
In the Western world, esophageal adenocarcinoma has surpassed in incidence squamous cell carcinoma.


OBJECTIVE
To determine the trend changes in histology and site distribution of esophageal malignancy between 1989 and 2004 in a southern state of the Indian subcontinent.


METHODS
A retrospective study on 994 patient records with esophageal carcinoma esophagus. Age, gender, clinical presentation and duration of illness were recorded in a prestructured proforma. The site of the tumor was classified as upper, mid, lower esophagus and esophagogastric junction. The 16 year study period was divided into four equal cohorts. Statistical analysis was performed using the chi-square test and the one way ANOVA wherever appropriate; p < 0.05 was considered significant.


RESULTS
Squamous cell carcinoma was the most common malignancy, seen in 912 (92%) patients. 82 patients (8%) had adenocarcinoma. 65 of these 82 patients (79%) had an esogastric junction malignancy and 17 (21%) a tumor in the distal third of the esophagus. No time trends were discernible with regard to the clinical presentation, frequency, mean age or gender. However, an increase in the number of patients below the age of 40 was noted (p=0.008). In squamous cell carcinoma of the esophagus, there was an overall increase in the mean age of occurrence (p=0.05), but no significant changes in the gender ratio. The lower esophageal cancers outnumbered the midesophageal cancers in the 4th cohort and the former represent the most common site of malignancy.


CONCLUSIONS
Squamous cell carcinoma is the most common type of esophageal cancer in the Indian subcontinent, located with a predilection in the distal third. Adenocarcinoma is uncommon and affects more frequently men younger than 40.
Cherian
Jijo V
JV
Dept. of Gastroenterology, Stanley Medical College, Chennai, India. drjijovc@yahoo.co.in
Sivaraman
Ramalingam
R
Muthusamy
Arun K
AK
Jayanthi
Venkataraman
V
D000230:Adenocarcinoma / Q000453:epidemiology* / Q000473:pathology; D000328:Adult; D000367:Age Factors; D000368:Aged; D000704:Analysis of Variance; D002294:Carcinoma, Squamous Cell / Q000453:epidemiology* / Q000473:pathology; D016009:Chi-Square Distribution; D015331:Cohort Studies; D004938:Esophageal Neoplasms / Q000453:epidemiology* / Q000473:pathology; D004943:Esophagogastric Junction / Q000473:pathology; D004947:Esophagus / Q000473:pathology; D005260:Female; D006801:Humans; D007194:India / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012737:Sex Factors; D013997:Time Factors