Background: The optimal timing for initiating multi-kinase inhibitors (MKIs) in patients with radioactive iodine-refractory (RAI-R) differentiated thyroid cancer (DTC) remains unclear. Thus, we evaluated the real-world practice patterns and outcomes in asymptomatic patients with progressive RAI-R DTC (≥1 lesion ≥1 cm in diameter) in the USA (US population) and outside the USA (non-US population).
Methods: In this prospective, non-interventional, open-label study, eligible patients were chosen by treating physicians to receive MKI therapy (cohort 1) or undergo active surveillance (cohort 2) at study entry. Cohort 2 patients were allowed to transition to MKI therapy later. The primary endpoint was time to symptomatic progression (TTSP) from study entry. Data were compared descriptively. When endpoints were inestimable, 36-month rates were calculated.
Results: Of the 647 patients, 478 underwent active surveillance (cohort 2) and 169 received MKI treatment (cohort 1). Patients underwent surveillance at a higher rate in the US (92.6%) vs the non-US (66.9%) populations. Half of US and non-US patients who qualified for MKI treatment had initial American Thyroid Association (ATA) low-to-intermediate-risk disease. In cohort 2, the 36-month TTSP rates from study entry were 65.6% and 66.5% in the US and non-US populations, respectively. Cohort 2 patients treated later demonstrated 36-month TTSP rates of 30.8% and 55.8% in the US and non-US populations, respectively.
Conclusions: Active surveillance is a viable option for asymptomatic patients with progressive RAI-R DTC. However, early intervention with MKI therapy may be more suitable for others. Further research is needed to identify patients who are optimal for active surveillance.
Registration: NCT02303444.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10831529 | PMC |
| http://dx.doi.org/10.1530/ETJ-23-0039 | DOI Listing |
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