CaPTHUS scoring model in primary hyperparathyroidism: can it eliminate the need for ioPTH testing?

Area of Science:

• Endocrinology
• Surgical Oncology
• Medical Diagnostics

Background:

• The CaPTHUS model previously showed 100% positive predictive value for single-gland disease in primary hyperparathyroidism.
• This model aimed to eliminate the need for intraoperative parathyroid hormone (ioPTH) testing.
• This study evaluates the CaPTHUS model's effectiveness in predicting long-term biochemical cure in a specific patient cohort.

Purpose of the Study:

• To assess the utility of the CaPTHUS scoring model in predicting long-term biochemical cure.
• To evaluate the CaPTHUS model's accuracy in identifying single-gland disease in primary hyperparathyroidism patients.
• To determine the necessity of intraoperative parathyroid hormone (ioPTH) testing alongside the CaPTHUS model.

Main Methods:

• Retrospective review of parathyroidectomies for primary hyperparathyroidism (2003-2012).
• Routine use of intraoperative parathyroid hormone (ioPTH) testing.
• Biochemical cure defined as normal calcium levels at 6 months post-surgery.

Main Results:

• 1,421 patients included; 78% had single adenoma.
• A CaPTHUS score of ≥ 3 had a 91% positive predictive value for single adenoma.
• A CaPTHUS score of ≥ 3 predicted 98% biochemical cure at 1 week and 6 months.

Conclusions:

• Patients with a preoperative CaPTHUS score of ≥ 3 demonstrated good long-term biochemical cure rates.
• The CaPTHUS model predicted adenoma in only 91% of cases, missing multigland disease in nearly 10%.
• Intraoperative parathyroid hormone (ioPTH) testing remains necessary, even with high CaPTHUS scores, to ensure optimal cure rates and manage multigland disease.