Using recombinant human thyroid-stimulating hormone for the diagnosis of recurrent thyroid cancer

Background: Recombinant human thyroid-stimulating hormone (rhTSH) has been suggested as a diagnostic agent in the diagnosis of recurrent thyroid cancer, instead of the current practice of thyroid hormone (THT) withdrawal. Methods: An evidenced-based literature review was used as the basis for a cost-utility, decision-analytic model. Outcome measures were safety, efficacy (diagnostic performance and quality of life) and cost effectiveness of rhTSH. Results: The literature search identified six comparative studies of rhTSH versus THT withdrawal. The most common adverse events associated with the use of rhTSH were headache (3.5-11.1%) and nausea (7.7-17%). When used as a diagnostic agent, the unadjusted sensitivity and specificity for rhTSH were 87% and 95%, respectively. Thus the use of rhTSH instead of THT withdrawal would result in a reduction in diagnostic accuracy, with 11% of patients' disease status being misclassified. Use of rhTSH resulted in a higher quality of life in the period prior to diagnostic testing than THT withdrawal (P < 0.001). When the impact of diagnostic performance, patient compliance to follow-up and modified quality of life were modelled over a 5 year time-frame, the incremental cost per QALY of rhTSH relative to THT withdrawal was $51 344.42. Conclusions: The use of rhTSH as a diagnostic agent appears to be safe but less diagnostically accurate and less cost-effective (on whole of healthcare cost basis) when used in the follow-up of patients with thyroid cancer who have had a previous negative radioiodine scan after thyroid hormone withdrawal.