CEACAM5 and androgen insensitivity syndrome: Serum CEA and CYFRA21-1 exhibited an AUC of 0.672 for AIS patients, with a sensitivity of 24.6% at a specificity of 97.6%, and an AUC of 0.538 for AIS patients, with a sensitivity of 30.7% at a specificity of 80.0%, respectively.