Table 2.
Population and sample sizes of the Jiangsu Four Cancers Study, 2003–2010
| Four Study Sites in Jiangsu Province | |||||
| Total population in 2010 | Cancer cases reported in 2003–2010a |
||||
| Esophageal cancer | Stomach cancer | Lung cancer | Liver cancer | ||
| 4,275,385 | 14,770 | 8,763 | 9,152 | 6,815 | |
| Jiangsu Four Cancers Study | |||||
| Controls, N (%) | Cases, N (%) |
||||
| Esophageal cancer | Stomach cancer | Lung cancer | Liver cancer | ||
| Questionnaire data collected | 8,019 (100) | 2,969 (100) | 2,216 (100) | 2,871 (100) | 2,018 (100) |
| Proxy interviews | 0 (0) | 822 (27.7) | 712 (32.1) | 1,097 (38.2) | 793 (39.3) |
| Blood samples collected | 6,650 (82.9) | 2,459 (82.8) | 1,710 (77.2) | 1,799 (62.7) | 1,190 (59.0) |
| County of residence | |||||
| Dafeng | 2,536 (31.6) | 639 (21.5) | 644 (29.1) | 624 (21.7) | 632 (31.3) |
| Ganyu | 2,010 (25.1) | 931 (31.4) | 570 (25.7) | 799 (27.8) | 390 (19.3) |
| Chuzhou | 1,180 (14.7) | 968 (32.6) | 470 (21.2) | 514 (17.9) | 303 (15.0) |
| Tongshan | 2,293 (28.6) | 431 (14.5) | 532 (24.0) | 934 (32.5) | 693 (34.3) |
| Method of cancer diagnosis | |||||
| Medical imagingb | 639 (21.5) | 422 (19.0) | 2,065 (71.9) | 1,593 (78.9) | |
| Pathology | 1,240 (41.8) | 1,035 (46.7) | 508 (17.7) | 237 (11.7) | |
| Endoscopy | 898 (30.2) | 644 (29.1) | 89 (3.1) | 12 (0.6) | |
| Biochemistryc | 34 (1.1) | 32 (1.4) | 48 (1.7) | 85 (4.2) | |
| Clinical diagnosis | 158 (5.3) | 83 (3.7) | 161 (5.6) | 91 (4.5) | |
a
Does not include the number of cases from Tongshan in 2003.
b
Includes computer tomography (CT), X-ray, ultrasound, and magnetic resonance imaging (MRI).
c
Includes biochemistry, immunology, cytology, and alpha-fetroprotein (AFP) tests.