The third generation epidermal growth factor receptor-tyrosine Kinase Inhibitor（EGFR-TKI） osimertinib has obvious curative effect for EGFR sensitive mutation and T790M mutation(PMID 27959700), but acquired drug resistance will occur. Previous studies show that apoptosis escape can lead to EGFR-TKI resistance.Osimertinib resistant cells show abnormal activation of PI3K/AKT/BIM activation(PMID 28765329). The classical drug aspirin can effectively decrease AKT phosphorylation and activate of BIM(PMID 28881293).So Investigators speculate that aspirin may decrease the PI3K/AKT/BIM signaling pathways, then promote osimertinib resistant cells apoptosis. The current study aims to evaluate the combination of aspirin and osimertinib in patients with EGFR/T790M mutations.

Reversible small-molecule EGF receptor tyrosine kinase inhibitors (EGFR-TKI) have shown dramatic therapeutic efficacy in non-small cell lung cancer (NSCLC) patients with EGFR-activating mutations, and have been recommended as the standard first-line therapy in these patients. However, despite excellent initial clinical responses, nearly all patients eventually develop drug resistance after a median period of about 10 months(PMID 26497205). Osimertinib is a 3rd-generation EGFR-TKI used to treat NSCLC patients with resistance to 1st generation EGFR-TKI due to T790M mutation. But Osimertinib also face the problem of acquired drug-resistance(PMID 27959700). Thus, innovative treatment strategies are urgently needed to overcome therapeutic resistance to Osimertinib to improve the survival of patients with NSCLC.

Molecular mechanisms underlying acquired Osimertinib resistance are still not fully understood. Previous study showed that one principal mechanism accounting for majority of acquired resistance to Osimertinib in lung cancer is mediated by an exon 20 C797S mutation etc(PMID 29596911). More molecular mechanisms are still to be found. Apoptosis is a process of programmed cell death that occurs in multicellular organisms. Biochemical events lead to characteristic cell changes (morphology) and death. These changes include blebbing, cell shrinkage, nuclear fragmentation, chromatin condensation, chromosomal DNA fragmentation, and global mRNA decay. Apoptosis has been found to be related to drug resistance to 1st generation EGFR-TKI(PMID 29731879). The investigators previous found apoptosis is also related to Osimertinib resistance(PMID 28765329). Therefore, promoting apoptosis may be an effective way to improve the response to Osimertinib treatment.

Investigators' group has focused on lung cancer targeted therapy for several years. Previously, investigators have reported that metformin in combination with 1st generation EGFR-TKI could enhance the effect of TKI (PMID 24644001). Therefore, investigators further asked whether the drug combination approach could overcome osimertinib resistance. Aspirin is a widely used and well-tolerated drug for Kawasaki disease, pericarditis, and rheumatic and has arisen keen interest as a potential anticancer agent ever since the report of the clinical evidence that the cancer risk and mortality are reduced in Colon cancer. Aspirin exerts remarkable antitumor properties in tumor cells and mouse models. It strongly inhibited the growth of lung cancer cells, and its combination with TKI agents, including Sorafenib (PMID: 28857200), significantly suppressed RAS-mutant cancers growth and prolonged remission in a xenograft model. Interestingly, Aspirin exposure significantly promoted the apoptosis suggesting that aspirin may overcome Osimertinib resistance by promoting the apoptosis.

Here, investigators'group observed that in clinic, several patients who took osimertinib and aspirin together have shown excellent effect.Investigators therefore conduct this clinical trial to observe whether the combination of Aspirin and Osimertinib could enhance efficacy of Osimertinib in lung cancer patients with EGFR mutation.

Inclusion Criteria:

Locally advanced (stage IIIB) or metastatic (stage IV) EGFR-mutant NSCLC. Presence of EGFR-sensitive mutations suitable for treatment with Osimertinib. Intended to receive Osimertinib as first-line therapy, with an expected survival period of more than 3 months.

At least one measurable tumor lesion that meets the following criteria:

Not previously irradiated. Accurately measurable. Baseline longest diameter ≥10 mm (for non-lymph node lesions) or short axis ≥15 mm (for lymph node lesions).

Measurement can be performed via chest CT or PET-CT, provided the method allows reliable repeated measurements.

Exclusion Criteria:

Currently receiving other anticoagulant treatments. Patients planning to receive anticancer therapies other than Osimertinib. Presence of contraindications to the use of Osimertinib or Aspirin.