胃镜检查还可以发现早期癌症，并且可以通过对可疑部位的活组织检查区分癌和非癌性病变。

Upper endoscopy can detect early cancer and can distinguish between cancerous and non-cancerous conditions by performing biopsies of suspicious areas.

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而且，口腔癌的发病率在40岁以后就上升，你的牙医会查看症状，比如不寻常的肿痛和溃疡，还有无痛性病变。

Plus, oral cancer is more common after 40; your dentist will look for symptoms, such as unusual swelling or sores, as well as painless lesions.

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事实上所有骨的转移性病变都是癌。

Virtually all bone metastases are from carcinomas.

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