Figure 2. Endpoint-free cumulative probability curves of NSSPM. (A) Global endpoint-free survival. (B) Age-adjusted endpoint-free survival (45 years cutoff). NSSPM: non-synchronous second primary malignancy; DTC: differentiated thyroid cancer; RAI-131(+): DTC patients treated with I-131 radioactive iodine; RAI-131(-): DTC patients not treated with I-131 radioactive iodine.
