Cationic anticancer peptides show strong selectivity to kill cancer cells compared to normal eukaryotic cells, due to the specific characteristics of the outer membrane of cancer cells, which contain more negative charges owing to the presence of negatively charged phosphatidylserine (PS) (3%–9% of the total membrane phospholipids) [7] and O-glycosylated mucines [8] than normal cells. Here, MUC5AC is linked to cancer.