Extreme procalcitonin elevation without infection in a patient with lung adenocarcinoma undergoing transformation to small-cell lung carcinoma: a case report. - Jug, Martina; Jegorovic, Boris; Stevanovic, Goran; Canovic, Petar; Simic, Jelena; Babic, Sanja; Jovanovic, Jovan; Pantic, Katarina; Jakovljevic, Stefan (Oncologie (De Gruyter), 2026)