TP53 and poikiloderma with neutropenia: Ectopic has-mir-34a (4th in the prediction list) expression could induce apoptosis of PN cells, and could result in cell cycle arrest, growth inhibition and attenuated chemoresistance to anticancer drug camptothecin, suggesting that has-mir-34a could sever as a potential choice for the treatment of p53-defective PN73.