Serum CYFRA 21-1 is one of the most reliable tumor markers for breast carcinoma [1] (multiple letters)

1. Rodríguez, C.A.
2. Cruz, J.J.
3. Martín, T.
4. Gómez, A.
5. Olaverri, A.
6. Hernández, M.
7. Nakata, B.
8. Ogawa, Y.
9. Hirakawa, K.