RT Journal Article SR Electronic T1 Tumour Markers in the Differential Diagnosis of Patients With Isolated Involuntary Weight Loss JF In Vivo JO In Vivo FD International Institute of Anticancer Research SP 3361 OP 3367 DO 10.21873/invivo.12634 VO 35 IS 6 A1 JAUME TRAPE A1 JORDI ALIGUE A1 MIREIA VICENTE A1 ANNA ARNAU A1 ANTONIO SAN-JOSE A1 JOSEP ORDEIG A1 ROSER ORDEIG A1 MARIONA BONET A1 ANDRES ABRIL A1 OMAR EL-BOUTROUKI A1 CAROLINA GONZALEZ-FERNANDEZ A1 MARIA SALA A1 CRISTINA FIGOLS A1 ELISABETH GONZALEZ-GARCIA A1 LOURDES MONTSANT A1 DOMINGO RUIZ YR 2021 UL http://iv.iiarjournals.org/content/35/6/3361.abstract AB Background/Aim: Paraneoplastic syndrome symptoms include isolated involuntary weight loss (IIWL). The differential diagnosis of cancer from other diseases may require a significant number of tests. Tumour markers (TMs) can be used for the diagnosis and stratification of patients according to cancer risk. Patients and Methods: This study included 606 patients (48% females) seen at the rapid diagnostic unit for IIWL. We determined the levels of TMs carcinoembryonic antigen, carbohydrate antigen 19-9, soluble fragments of cytokeratin 19, carbohydrate antigen 15-3, carbohydrate antigen 125, neuron specific enolase, alpha-fetoprotein, prostatic specific antigen using the multiparametric analyser COBAS 601. Two cut-off points were established, the upper reference limit described by the manufacturer and a high cut-off point suggested by Molina et al., to stratify patients according to cancer risk. Results: Patients were classified according to TM levels as follows: I) all TMs below the upper reference limit; II) highest number of TMs between the two cut-offs; III) at least one TM above the higher cut-off. The odds ratio for malignancy was 4.3 for group II and 248 for group III. These results indicate that when at least one TM is above the higher cut-off, neoplasia is highly probable. Conclusion: TM determination allowed to establish cancer risk in patients with IIWL.