人類一生大致是20%，美國人比較高，一生接近40%，
在自然界被發現的鯊魚，癌症發病率 < 0.01%，注意這不是一生的發病率，一生的癌症發病率比這個還要高很多。
AI的總結：
Summary Comparison
| Species | Estimated Lifetime Cancer Risk | Notes |
|---|---|---|
| Humans (U.S.) | ~40% | Common in old age; rising with lifespan |
| Sharks | Likely <1%, possibly <0.1% | Cancer rare but confirmed in several species |
| Other Fish | 0.1–1% | Varies by species and environment (pollution increases rates) |
