A Study to Assess the Efficacy of WSD0922-FU in Patients With C797S+ Advanced Non-small Cell Lung Cancer

Inclusion criteria: * Provision of signed and dated, written informed consent prior to any study-specific procedures, sampling and analyses. * Male or female aged ≥18 years old. * Histological or cytological confirmation diagnosis of NSCLC. * Locally advanced or metastatic NSCLC, not amenable to curative surgery or radiotherapy. * Evidence of radiological disease progression while on a previous continuous treatment with first-line Osimertinib treatment. * Documented EGFR mutation . * Eastern Cooperative Oncology Group (ECOG) 0-1 and a minimum life expectancy of 12 weeks. * At least one lesion, not previously irradiated and not chosen for biopsy during the study. * Females should have evidence of non-childbearing potential. Exclusion criteria: * Any investigational agents or other anticancer drugs from a previous treatment regimen or clinical study within 14 days of the first dose of study treatment. * Any unresolved toxicities from prior therapy greater than CTCAE Grade 1. * Symptomatic brain complications that require urgent neurosurgical or medical intervention. * Any evidence of severe or uncontrolled systemic diseases. * Refractory nausea and vomiting, chronic gastrointestinal diseases, inability to swallow the formulated product or previous significant bowel resection. * Past medical history of ILD. * Inadequate bone marrow reserve or organ function as demonstrated. * Males and females of reproductive potential. * Known intracranial hemorrhage which is unrelated to tumor. * Seizures requiring a change in anti-epileptic medications.