By injecting miR-NC, miR-23b-3p-mimcis, sh-KTN1-AS1+miR-23b-3p-mimics subcutaneously into nude mice, we found that the tumor size of nude mice injected with miR-23b-3p-mimcis decreased observably, while those of nude mice injected with sh-KTN1-AS1+miR-23b-3p-mimics did not differ notably from those of miR-NC. This evidence concerns the gene PTGDR and neoplasm.