Paweł Jurczak, Dominik Małek, Paweł Puczel, Marta Siwek, and Klaudia Sztaba, “CLINICAL UTILITY OF CYFRA 21-1 IN ONCOLOGY: A COMPREHENSIVE REVIEW OF CURRENT EVIDENCE AND FUTURE DIRECTIONS”, IJITSS, vol. 5, no. 4(48), Dec. 2025, doi: 10.31435/ijitss.4(48).2025.4207.