BACKGROUND
Due to the rarity of mesenchymal-epithelial transition factor (
MET
) fusions, the clinical efficacy of crizotinib has only been described in a few patients with
MET
fusions involving various fusion partners. Herein, we report the clinical response to crizotinib of a patient with advanced poorly differentiated non-small cell carcinoma (NSCLC) having concurrent
MET
fusions.
CASE SUMMARY
A 46-year-old woman was diagnosed with poorly differentiated NSCLC (T4N3M1). With no classic driver mutations, she was treated with two cycles of gemcitabine and cisplatin without clinical benefit. Targeted sequencing revealed the detection of two concurrent
MET
fusions,
KIF5B-MET
and novel
MET-CDR2
. Crizotinib was initiated at a dose of 250 mg twice daily. Within 4 wk of crizotinib therapy, repeat computed chromatography revealed a dramatic reduction in primary and metastatic lesions, assessed as partial response. She continued to benefit from crizotinib for 3 mo until disease progression and died within 1 mo despite receiving nivolumab therapy.
CONCLUSION
Crizotinib sensitivity was observed in an advanced poorly differentiated NSCLC patient with concurrent
MET
fusions
KIF5B-MET
and
MET-CDR2
. Crizotinib can serve as a therapeutic option for patients with MET fusions. In addition, our case also highlights the importance of comprehensive genomic profiling particularly in patients with no classic driver mutation for guiding alternative therapeutic decisions.