What it isOral multikinase inhibitor of RET, VEGFR, and EGFR for symptomatic or progressive unresectable locally advanced or metastatic medullary thyroid cancer.
Why this oneTargets RET-driven signaling and can produce durable disease control with once-daily oral dosing.
What limits itA roughly 19-day half-life makes QT toxicity slow to emerge and slow to resolve; correct electrolytes, avoid QT-prolonging drugs, and perform serial ECGs.
BOXED WARNING QT prolongation, torsades de pointes, and sudden death. Do not use in hypocalcemia, hypokalemia, hypomagnesemia, or long QT syndrome; correct electrolytes and monitor.
FDA dosing
Population
Start
Target
Max
Medullary thyroid cancer (unresectable, locally advanced or metastatic)
Adults
300 mg QD until progression or unacceptable toxicity
Pregnancy Can cause fetal harm (embryotoxic, fetotoxic, teratogenic in animals).
Lactation Do not breastfeed during treatment and for 4 months after the last dose.
⚠ BOXED WARNING
QT prolongation can cause torsades and sudden death; avoid long-QT states, correct calcium/potassium/magnesium, avoid QT-prolonging drugs, and monitor ECGs and electrolytes