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Primary site distribution of metastatic cancer of 24 cases in Group II according to the clinical history
| Primary tumor site | History of extrapulmonary malignancy |
No. of cases (%) | |
|---|---|---|---|
| Previously known (n = 17) | Previously unknown (n = 7) | ||
| Colorectum | 6 | 4 | 10 (41.7) |
| Breast | 5 | 0 | 5 (20.8) |
| Kidney | 2 | 0 | 2 (8.3) |
| Stomach | 1 | 0 | 1 (4.2) |
| Duodenum | 1 | 0 | 1 (4.2) |
| Liver | 1 | 0 | 1 (4.2) |
| Pancreas | 1 | 0 | 1 (4.2) |
| Gallbladder | 0 | 1 | 1 (4.2) |
| Prostate | 0 | 1 | 1 (4.2) |
| Skin | 0 | 1 | 1 (4.2) |
