For patients with differentiated thyroid carcinoma (DTC), choosing between a hemithyroidectomy (removing half the thyroid) and a total thyroidectomy (removing the whole thyroid) is a key decision. A new meta-analysis combining data from many studies looked at how often cancer comes back after each surgery. The analysis included nearly 100,000 patients, with about 75,500 having total thyroidectomy and 23,000 having hemithyroidectomy.
The results show that the chance of cancer returning is higher after hemithyroidectomy. About 8.1% of patients who had hemithyroidectomy experienced a recurrence, compared to 5.8% of those who had total thyroidectomy. This means the risk difference is about 3 percentage points higher for hemithyroidectomy. In other words, for every 100 patients treated, about 3 more would have a recurrence with hemithyroidectomy than with total thyroidectomy.
The study also calculated the odds of recurrence, which were about 1.56 times higher for hemithyroidectomy. This means that patients who had hemithyroidectomy had about a 56% higher chance of recurrence compared to those who had total thyroidectomy. However, it is important to note that this analysis is based on retrospective studies, meaning researchers looked back at past medical records rather than following patients forward in a controlled trial. This type of study can show an association but cannot prove that the surgery itself causes the difference.
Because the underlying studies are retrospective, there may be other factors that influenced which patients got which surgery. For example, patients with smaller or less aggressive tumors might have been more likely to get hemithyroidectomy, while those with larger or more aggressive tumors might have gotten total thyroidectomy. These differences could affect the recurrence rates. The meta-analysis tried to account for this, but the results should be interpreted with caution.
For patients and doctors, this information is useful when deciding on the best surgical approach. Total thyroidectomy appears to offer a lower chance of cancer coming back, but it also carries a higher risk of complications like damage to the parathyroid glands or the nerve that controls the voice. Hemithyroidectomy has fewer risks but a higher recurrence rate. The choice should be personalized based on the patient's specific tumor characteristics, overall health, and preferences.
In summary, this large meta-analysis found that hemithyroidectomy is associated with a higher recurrence rate than total thyroidectomy for differentiated thyroid cancer. The absolute difference is about 3%, meaning that for every 100 patients, 3 more would have a recurrence with the less extensive surgery. While this information is valuable, it comes from retrospective data, so further prospective studies are needed to confirm these findings and help guide treatment decisions.
