A Proposed Modified Staging System for Medullary Thyroid Cancer: A SEER Analysis With Multicenter Validation.

Although a retrospective study from Portugal et al showed that the T4b category was associated with a worse prognosis, the difference did not reach statistical significance ( P = .06). 18 In our study, the division of the T4 category based on the tumor size could better stratify the death risk of MTC patients ( P = .003).

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