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Logo of nihpaAbout Author manuscriptsSubmit a manuscriptHHS Public Access; Author Manuscript; Accepted for publication in peer reviewed journal;
Cancer. Author manuscript; available in PMC 2009 October 1.
Published in final edited form as:
Cancer. 2008 October 1; 113(7): 1676–1684.
doi: 10.1002/cncr.23788

Table 2

Characteristics of patients with histologically confirmed respiratory tract carcinomas, Singapore Chinese Health Study 1993-2005
Upper respiratory tractLower respiratory tract

Nasopharyngeal carcinomaNon-nasopharyngeal carcinomaLung carcinoma
Number of cases175150821
Proportion of males68.6%83.3%70.0%
Mean age at diagnosis (years)59.166.768.2
Histological subtype
 Squamous cell carcinoma5 (2.9%)132 (88.0%)195 (23.8%)
 Undifferentiated carcinoma155 (88.6%)4 (2.7%)14 (1.7%)
 Adenocarcinoma2 (1.1%)5 (3.3%)342 (41.7%)
 Small cell carcinoma00 (0.7%)97 (11.8%)
 Other or unspecified carcinoma13 (7.4%)9 (6.0%)173 (21.1%)