sentence: In this sense , there are different strategies , based on the use of gene regulatory elements such as promoters , or proteins that have high affinity for specific cells such as receptors that selectively eliminate cancer cells without harming healthy cells.Based on the frequent overexpression of EGFR or its mutant in OC cells , carrying vectors guided by synthetic nano-antibodies for EGFRvIII and EGFR were developed to deliver human recombinant DNases ( DNASE1 , DNASE1L3 , DNASE2 , DFFB ) into human OC cells from ascites and cultures , achieving the degradation of their genomic DNA and , consequently , cancer cell death , without affecting the healthy cells [ 43 ] .