Cancer is the first leading cause of death in Taiwan. Targeted therapy allows the cancer cells to be specifically targeted, reduces the side effects,achieves the purpose of precision cancer treatment. This report contains two invention technologies which combined early & specific diagnosis of a specific Aurora-A mRNA isoform in cancers (the companion diagnosis)the treated with a selective locked nucleic acid (LNA)-modified novel double-stranded short interfering nucleic acid (siRNA) to inhibit the translation of this Aurora-A mRNA isoform (targeted therapy) in cancers.