注意早期体征和症状（例如对宫颈癌、乳腺癌和口腔癌），以便在疾病进入晚期之前促进诊断和治疗。

The awareness of early signs and symptoms (such as cervical, breast and oral cancers) in order to facilitate diagnosis and treatment before the disease becomes advanced.

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肺癌还可以几乎毫无症状的存在多年，直到晚期才被发现。

Lung cancer can also exist for years, hardly creating symptoms until its most virulent stage.

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出现症状时，患者常常已到疾病晚期，中枢神经系统受到影响。

When symptoms emerge, the patient is often already in an advanced disease stage where the central nervous system is affected.

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