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Ref Type | Journal Article | ||||||||||||
PMID | (38438731) | ||||||||||||
Authors | Subbiah V, Gouda MA, Iorgulescu JB, Dadu R, Patel K, Sherman S, Cabanillas M, Hu M, Castellanos LE, Amini B, Meric-Bernstam F, Shen T, Wu J | ||||||||||||
Title | Adaptive Darwinian off-target resistance mechanisms to selective RET inhibition in RET driven cancer. | ||||||||||||
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Abstract Text | Patients treated with RET protein tyrosine kinase inhibitors (TKIs) selpercatinib or pralsetinib develop RET TKI resistance by secondary RET mutations or alterative oncogenes, of which alterative oncogenes pose a greater challenge for disease management because of multiple potential mechanisms and the unclear tolerability of drug combinations. A patient with metastatic medullary thyroid carcinoma (MTC) harboring a RET activation loop D898_E901del mutation was treated with selpercatinib. Molecular alterations were monitored with tissue biopsies and cfDNA during the treatment. The selpercatinib-responsive MTC progressed with an acquired ETV6::NTRK3 fusion, which was controlled by selpercatinib plus the NTRK inhibitor larotrectinib. Subsequently, tumor progressed with an acquired EML4::ALK fusion. Combination of selpercatinib with the dual NTRK/ALK inhibitor entrectinib reduced the tumor burden, which was followed by appearance of NTRK3 solvent-front G623R mutation. Preclinical experiments validated selpercatinib plus larotrectinib or entrectinib inhibited RET/NTRK3 dependent cells, whereas selpercatinib plus entrectinib was necessary to inhibit cells with RET/NTRK3/ALK triple alterations or a mixture of cell population carrying these genetic alterations. Thus, RET-altered MTC adapted to selpercatinib and larotrectinib with acquisition of ETV6::NTRK3 and EML4::ALK oncogenes can be managed by combination of selpercatinib and entrectinib providing proof-of-concept of urgency of incorporating molecular profiling in real-time and personalized N-of-1 care transcending one-size-fits-all approach. |
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Therapy Name | Drugs | Efficacy Evidence | Clinical Trials |
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Gene | Variant | Impact | Protein Effect | Variant Description | Associated with drug Resistance |
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Molecular Profile | Indication/Tumor Type | Response Type | Therapy Name | Approval Status | Evidence Type | Efficacy Evidence | References |
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RET D898_E901del | medullary thyroid carcinoma | predicted - sensitive | Selpercatinib | Case Reports/Case Series | Actionable | In a Phase I/II trial (LIBRETTO-001), Retevmo (selpercatinib) treatment resulted in a clinical response after one month, with a partial response in liver lesions and abdominal lymph nodes that was maintained for 24 months, in a patient with metastatic medullary thyroid carcinoma harboring RET D898_E901del (PMID: 38438731; NCT03157128). | 38438731 |