FOLH1 and neoplasm: Additionally, other functional targeting ligands, such as arginine-glycine-aspartic acid sequences (RGD), hyaluronic acid, prostate-specific membrane antigen sequences (PSMA) have also been proven to promote drug accumulation in different types of tumor after appropriate modification on nanoparticles (Chai et al., 2019; Ma et al., 2019; Yoo et al., 2019; Zhou et al., 2019).