Recently , its expression has been shown to up-regulated in a variety of tumor tissues and in the surem of cancer-beating patients .

近来的研究显示发现，PHB不仅在多种肿瘤细胞及肿瘤组织中表达增高，其在肿瘤病人血清中也高表达，提示了PHB作为肿瘤标志物的运用价值。

Methods55workers ( exposure group ) and40controls ( control group ) were studied by measuring the levels of malondi ˉ aldehyde ( MDA ), total superoxide dismutase ( T_SOD ) and salicylic acid ( SA ) in surem .

方法对多环芳烃接触者55名（接触组）、正常对照人群40名（对照组）血清中丙二醛（MDA）、超氧化物歧化酶总量（T-SOD）、血清唾液酶（SA）进行测定。