Table 3.
Overview of cancer sites according to correctly classified and misclassified cancers
| Misclassified cancers (n = 411)1 | ||||
|---|---|---|---|---|
| Cancer site | Correctly classified cancers (n = 1,965) | Date of diagnosis (n = 344) | ICD code (n = 72) | |
| More than 1 month (n = 324)2 | More than 1 year (n = 20) | |||
| Head and neck | 52 (73.2) | 19 (26.8) | 0 | 0 |
| Oesophagus and gastric | 124 (87.9) | 13 (9.2) | 0 | 4 (2.8) |
| Colorectal | 361 (91.9) | 25 (6.4) | 1 (0.3) | 6 (1.5) |
| Hepato‐Pancreato‐Biliary | 88 (72.1) | 24 (19.7) | 1 (0.8) | 9 (7.4) |
| Lung and mesothelioma | 291 (82.2) | 41 (11.6) | 2 (0.6) | 20 (5.6) |
| Bone and soft tissue | 10 (66.7) | 5 (33.3) | 0 | 0 |
| Breast | 323 (88.3) | 37 (10.1) | 2 (0.5) | 4 (1.1) |
| Female genital organs | 89 (88.1) | 9 (8.9) | 1 (1.0) | 2 (2.0) |
| Male genital organs | 296 (77.9) | 79 (20.9) | 5 (1.3) | 0 |
| Unitary tract | 136 (76.8) | 38 (21.5) | 0 | 3 (1.7) |
| Central nervous system | 15 (78.9) | 3 (15.8) | 0 | 1 (5.3) |
| Haematological | 130 (78.8) | 27 (16.4) | 8 (4.8) | 0 |
| Other | 10 (47.6) | 1 (4.8) | 0 | 10 (47.6) |
| Unknown primary origin | 40 (71.4) | 3 (5.4) | 0 | 13 (23.2) |
Numbers are displayed in total number per cancer site (percentage per row). Cancers misclassified with regard to ICD code are classified according to the different cancer groups based on the ICD code of the Rotterdam Study.
1
Five cancers were both misclassified with regard to date >1 month and <1 year and with regard to ICD code. Therefore, the number of misclassified cancers is lower than the total number of cancers in the different misclassification categories.
2
Difference in date of diagnosis more than 1 month and less than 1 year.
Abbreviation: ICD, International Classification of Diseases.