Long response to camrelizumab in metastatic lung squamous cell carcinoma with high PD-L1 expression despite EGFR G719S mutation: A case report

Immune checkpoint inhibitors (ICIs) have been widely used in non-small cell lung cancer with wildtype EGFR/ALK genes. However, the effect of ICIs on advanced NSCLC with EGFR genes sensitive mutations has been controversial. There are no reports on whether ICIs monotherapy can be used in the treatment of NSCLC with EGFR sensitive mutations. A patient with metastatic lung squamous cell carcinoma with EGFR G719s mutations, high PD-L1 score and a tuberculosis history was given first-line treatment of afatinib, camrelizumab monotherapy (200 mg, intravenous, once every three weeks) from February 24,2020 to January 2023. The patient achieved partial response (PR) after treatment with camrelizumab. The progress-free survival (PFS) due to camrelizumab monotherapy was more than 34 months.It is concluded that camrelizumab has promising potential effectiveness as a treatment option for lung squamous cell cancer with EGFR G719 mutations and high PD-L1 score.