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|Ref Type||Journal Article|
|Authors||Kurzrock R, Ball DW, Zahurak ML, Nelkin BD, Subbiah V, Ahmed S, O'Connor A, Karunsena E, Parkinson RM, Bishop JA, Ha Y, Sharma R, Gocke CD, Zinner R, Rudek MA, Sherman SI, Azad NS|
|Title||A Phase I Trial of the VEGF Receptor Tyrosine Kinase Inhibitor Pazopanib in Combination with the MEK Inhibitor Trametinib in Advanced Solid Tumors and Differentiated Thyroid Cancers.|
|Journal||Clinical cancer research : an official journal of the American Association for Cancer Research|
|Date||2019 Sep 15|
|Abstract Text||Differentiated thyroid cancer (DTC) responds to VEGF receptor inhibitors. VEGF signals through RAS/RAF/MEK signaling. We evaluated the safety and efficacy of the VEGF receptor inhibitor pazopanib and MEK inhibitor trametinib in advanced solid tumors and DTC.Patients with advanced solid tumors were enrolled in a phase I, multicenter trial with a DTC expansion cohort. Patients received pazopanib 400-800 mg and trametinib 1-2 mg daily. Efficacy in the expansion cohort was assessed with objective response (OR) at 6 months of treatment.Twenty-six patients were enrolled in five dose levels. MTD was not reached; the recommended phase II dose was pazopanib 800 mg orally and trametinib 2 mg orally every day. There was one dose-limiting toxicity on dose level 1 with grade 3 fatigue and muscle weakness. Common grade 3 adverse events were elevated transaminases (19%), diarrhea (15%), hypertension (12%), and fatigue (8%). Thirteen patients were enrolled in the DTC cohort; OR was 33% (95% confidence interval, 9.9, 65.1%) and median progression-free survival was 10.7 months. The cohort was terminated after planned interim analysis suggested insufficiently increased activity against the historical control of pazopanib alone. Reduction in tumor diameter negatively correlated with p-ERK change in tumor (Spearman ρ = -0.71; P = 0.05). NRAS mutation was associated with response (Fisher exact P = 0.008).Pazopanib + trametinib was tolerable at full single-agent doses with clinical activity in DTC but did not achieve the prespecified response rate target.|
|Molecular Profile||Treatment Approach|
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|Therapy Name||Drugs||Efficacy Evidence||Clinical Trials|
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|NRAS mutant||differentiated thyroid gland carcinoma||predicted - sensitive||Pazopanib + Trametinib||Phase I||Actionable||In a Phase I trial, of 10 differentiated thyroid cancer patients, 3 of 3 responders (all partial responses) to treatment with the combination of Votrient (pazopanib) and Mekinist (trametinib) harbored NRAS mutations, while none of the seven patients with stable disease or progressive disease had NRAS mutations (PMID: 31186313; NCT01438554).||31186313|