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Ref Type Journal Article
PMID (36108661)
Authors Subbiah V, Wolf J, Konda B, Kang H, Spira A, Weiss J, Takeda M, Ohe Y, Khan S, Ohashi K, Soldatenkova V, Szymczak S, Sullivan L, Wright J, Drilon A
Title Tumour-agnostic efficacy and safety of selpercatinib in patients with RET fusion-positive solid tumours other than lung or thyroid tumours (LIBRETTO-001): a phase 1/2, open-label, basket trial.
URL
Abstract Text Selpercatinib is a first-in-class, highly selective RET kinase inhibitor with CNS activity that has shown efficacy in RET fusion-positive lung and thyroid cancers. RET fusions occur rarely in other tumour types. We aimed to investigate the efficacy and safety of selpercatinib in a diverse group of patients with RET fusion-positive non-lung or thyroid advanced solid tumours (ie, a tumour-agnostic population).LIBRETTO-001 is an ongoing phase 1/2, single-group, open-label, basket trial of selpercatinib in patients aged 18 years and older (or ≥12 years, where permitted by regulatory authorities) with RET-altered cancers. The trial is being conducted at 89 sites in 16 countries; the tumour-agnostic population was enrolled at 30 sites (outpatient and inpatient medical facilities) across eight countries. A prespecified interim analysis of LIBRETTO-001 was planned to investigate the efficacy and safety of selpercatinib in a tumour-agnostic population of patients with RET fusion-positive advanced solid tumours; the data cutoff date was Sept 24, 2021. Eligible patients had disease progression on or after previous systemic therapies or no satisfactory therapeutic options and an Eastern Cooperative Oncology Group performance status of 0-2. Selpercatinib was orally administered in a continuous 28-day cycle. Patients enrolled in the phase 1 dose-escalation portion received between 20 mg once daily or 20-240 mg twice daily; the phase 2 recommended dose was 160 mg twice daily. The primary endpoint was the objective response rate as determined by the independent review committee. The efficacy-evaluable tumour-agnostic population was defined as patients with RET fusion-positive cancer, other than non-small-cell lung cancer and thyroid cancer, who had at least 6 months of follow-up from the first study dose at the time of data cutoff (all responders at the time of data cutoff were followed up for at least 6 months from the onset of response unless they progressed or died earlier). Safety was analysed in the tumour-agnostic population of patients who had been enrolled and received selpercatinib on or before the data cutoff date. This study is registered with ClinicalTrials.gov (NCT03157128) and is still recruiting participants.Between Dec 4, 2017, and Aug 4, 2021, 45 patients with RET fusion-positive tumour-agnostic cancers were enrolled from the phase 1 dose-escalation and phase 2 dose-expansion cohorts of the trial. 43 (96%) of 45 patients received a starting dose of selpercatinib at the recommended dose of 160 mg twice daily. Of the two patients who did not, one received a dose of 160 mg twice daily via intra-patient dose escalation (as allowed per protocol for patients enrolled in the phase 1 portion of the study at lower doses) and the other patient's starting dose of 120 mg twice daily was never escalated. Of the 41 efficacy-evaluable patients, the objective response rate as per the independent review committee was 43·9% (95% CI 28·5-60·3; 18 of 41 patients). The most common grade 3 or worse treatment-emergent adverse events were hypertension (ten [22%] of 45 patients), increased alanine aminotransferase (seven [16%]), and increased aspartate aminotransferase (six [13%]). Treatment-emergent serious adverse events occurred in 18 (40%) of 45 patients. No treatment-related deaths occurred.Selpercatinib showed clinically meaningful activity in the RET fusion-positive tumour-agnostic population, with a safety profile consistent with that observed in other indications. Comprehensive genomic testing that includes RET fusions will be crucial for identifying patients who might benefit from selpercatinib.Loxo Oncology.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
RET fusion colon cancer sensitive Selpercatinib Case Reports/Case Series Actionable In a Phase I/II trial (LIBRETTO-001), Retevmo (selpercatinib) treatment resulted in an objective response rate (ORR) of 43.9% (18/41, 2 complete responses, 16 partial responses) with a median duration of response (mDOR) of 24.5 months in patients with RET fusion-positive advanced or metastatic solid tumors, and ORR and mDOR in patients with colon cancer were 20.0% (2/10) and 9.4 months, respectively (PMID: 36108661; NCT03157128). 36108661
RET fusion Advanced Solid Tumor sensitive Selpercatinib FDA approved - On Companion Diagnostic Actionable In a Phase I/II trial (LIBRETTO-001) that supported FDA approval, Retevmo (selpercatinib) treatment resulted in an objective response rate of 44% (18/41, 2 complete responses, 16 partial responses), a clinical benefit rate of 63% (26/41), a median duration of response of 24.5 months, and a median progression-free survival of 13.2 months in patients with RET fusion-positive advanced solid tumors (PMID: 36108661; NCT03157128). 36108661 detail...
RET fusion pancreatic cancer predicted - sensitive Selpercatinib Case Reports/Case Series Actionable In a Phase I/II trial (LIBRETTO-001), Retevmo (selpercatinib) treatment resulted in an objective response rate (ORR) of 43.9% (18/41, 2 complete responses, 16 partial responses) with a median duration of response (mDOR) of 24.5 months in patients with RET fusion-positive advanced or metastatic solid tumors, and ORR and mDOR in patients with pancreatic cancer were 54.5% (6/11) and not reached, respectively (PMID: 36108661; NCT03157128). 36108661