Cancers that are detected early – when they are small and less likely to have metastasized (spread away from the primary tumor) – are more likely to be treatable with local therapy, whereas successful treatment is ultimately unlikely once metastatic tumors develop. And improved therapies mean that patients can be treated with drugs that work better (and that patients are more likely to receive the full dose needed).
那些早期发现的癌症——当癌瘤较为细小且尚未扩散（指从原发瘤处蔓延开来）时——更容易通过局部治疗来应对，但一旦扩散则任何治疗方案的成功率都将微乎其微。而改良的疗法意味着病人可以得到更有效的药物治疗（也更可能得到足够的所需剂量）。