Untreated MKN-1 cells (mock), lentiviral negative control (LV-nc), and MKN-1 cells with stable knockdown of FAAH (LV-shFAAH) were injected into nude mice to construct tumour xenograft models, followed by 5-fluorouracil (5-FU) to act as the control group of chemotherapeutic drugs. Here, FAAH is linked to neoplasm.