常常发生这种现象,癌症患者给予阿霉素或14-羟正定霉素,症状减轻,然而患者又会复发,不久对开初破坏肿瘤细胞的药物失效。科学家怀疑,发生许多例这种现象,是癌细胞重新生长,并学会了如何避开药物的结果。经组织培养进一步研究了这个问题。产生抗药性的细胞表现在打开和放大的基因当药物一插入就把药物泵出。一旦培养 Frequently, this phenomenon occurs when cancer patients give doxorubicin or 14-hydroxydaunorubicin, and the symptoms are reduced. However, the patient will relapse. Soon after, the drugs that destroy tumor cells at the beginning of the experiment are ineffective. Scientists suspect that many cases of this phenomenon have occurred, that cancer cells have re-growth, and learned how to avoid the results of drugs. The organizational culture has further studied this issue. Cells that develop drug resistance manifest themselves in open and amplified genes that pump the drug as soon as the drug is inserted. Once cultured