Table 4. Comparison of bone metastases between pulmonary and prostate cancers in patients with extensive bone metastases (n = 3335).
| Skeleton | Pulmonary cancer (n = 1554) | Prostate cancer (n = 1781) | χ 2 | p value | ||
|---|---|---|---|---|---|---|
| n | % | n | % | |||
| Vertebrae | 419 | 26.96 | 415 | 23.30 | 5.923 | 0.015 |
| Pelvis | 361 | 23.23 | 504 | 28.30 | 11.144 | 0.001 |
| Thoracic bones | 615 | 39.58 | 672 | 37.73 | 1.190 | 0.275 |
| Skull | 58 | 3.73 | 60 | 3.37 | 0.321 | 0.571 |
| Extremities | 101 | 6.50 | 130 | 7.30 | 0.826 | 0.363 |
Note: n, the lesion number of bone metastases. Chi-square test of likelihood ratio was performed to compare the different proportions of bone metastases between pulmonary and prostate cancers.