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Therapeutic strategies in RET gene rearranged non-small cell lung cancer

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JOURNAL OF HEMATOLOGY & ONCOLOGY
卷 14, 期 1, 页码 -

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BMC
DOI: 10.1186/s13045-021-01063-9

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Non-small cell lung cancer; RET gene fusions; Tyrosine kinase inhibitors; Metastasis

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Recent FDA approvals for tumor-agnostic drugs have shifted cancer treatment from organ/histology-specific strategies to biomarker-guided approaches. RET gene fusions, known oncogenic drivers in various tumors, can be effectively targeted by inhibitors like selpercatinib and pralsetinib, showing significant clinical benefits in NSCLC patients.
The recent approvals by the Food and Drug Administration several tumor-agnostic drugs have resulted in a paradigm shift in cancer treatment from an organ/histology-specific strategy to biomarker-guided approaches. RET gene fusions are oncogenic drivers in multiple tumor types and are known to occur in 1-2% of non-squamous NSCLC patients. RET gene fusions give rise to chimeric, cytosolic proteins with constitutively active RET kinase domain. Standard therapeutic regimens provide limited benefit for NSCLC patients with RET fusion-positive tumors, and the outcomes with immunotherapy in the these patients are generally poor. Selpercatinib (LOXO-292) and pralsetinib (BLU-667) are potent and selective inhibitors that target RET alterations, including fusions and mutations, irrespective of the tissue of origin. Recently, the results from the LIBRETTO-001 and ARROW clinical trials demonstrated significant clinical benefits with selpercatinib and pralsetinib respectively, in NSCLC patients with RET gene fusions, with tolerable toxicity profiles. These studies also demonstrated that these RET-TKIs crossed the blood brain barrier with significant activity. As has been observed with other TKIs, the emergence of acquired resistance may limit long-term efficacy of these agents. Therefore, understanding the mechanisms of resistance is necessary for the development of strategies to overcome them.

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