Published online Sep 26, 2021. doi: 10.12998/wjcc.v9.i27.8220
Peer-review started: May 8, 2021
First decision: June 5, 2021
Revised: June 17, 2021
Accepted: July 5, 2021
Article in press: July 5, 2021
Published online: September 26, 2021
Epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKIs) have been adopted as the standard of care for non-small cell lung cancer (NSCLC) patients harboring EGFR sensitizing mutations. Besides the two common mutations exon 19 deletion and L858R, which together comprise approximately 85% of EGFR mutations in NSCLC, rare EGFR mutations also exist, including point mutations, deletions, and insertions spanning EGFR exons 18-25. However, the responsiveness of uncommon EGFR mutations to EGFR TKIs remains elusive and attracts increasing interest.
Herein, we report a 55-year-old male patient with stage IV NSCLC harboring a rare EGFR L833F-L861Q compound mutation in cis. The patient achieved a partial response to first-line treatment with afatinib and a progression-free survival of 10 mo. After afatinib failure, the patient received multiple line treatments with chemotherapy. Upon disease progression, the heavily pretreated patient was treated with osimertinib and bevacizumab, and both lung lesion and brain metastases were stable for more than 3 mo. He had an overall survival of 25 mo.
Our case revealed that both afatinib and the osimertinib + bevacizumab combination demonstrated clinical efficacy in NSCLC harboring an EGFR L833F-L861Q compound mutation. The results provide more therapeutic options for patients with rare compound mutations.
Core Tip: Our case revealed that both afatinib and the osimertinib + bevacizumab combination demonstrated clinical efficacy in a non-small cell lung cancer patient harboring a rare epidermal growth factor receptor (EGFR) L833F-L861Q compound mutation. The results provide more options for the clinical management of patients with rare EGFR compound mutations.