To take just two examples, says Pesus Chou, for liver and intestinal cancer, existing tests are expensive and inaccurate, so they are not very cost-effective. The exception is testing for cervical cancer.
周碧瑟指出，無論是篩檢腸癌的大便潛血、篩檢肝癌的血液中胎兒蛋白指數，不是成本高，就是準確度低，唯一的例外是子宮頸抹片檢查。