那些癌瘤要么太小以至于未能威胁，要么在过一段时间后的临床检测中发现后（或者疯狂扩散而使人无计可施）反而更能得到有效治疗。
The cancers either were growing so slowly that they did not pose a problem, or they would have been treated successfully if discovered clinically later (or they were so aggressive that little could be done).