Serum level of CXCL10 is associated with inflammatory prognostic biomarkers in patients with diffuse large B‐cell lymphoma

Inflammatory biomarkers, such as the neutrophil to lymphocyte ratio (NLR), lymphocyte to monocyte ratio (LMR), and Glasgow Prognostic Score (GPS) have been proposed to predict prognosis in diffuse large B‐cell lymphoma (DLBCL). C‐X‐C motif ligand 10 (CXCL10) is a chemokine released from inflammatory cells in the tumor microenvironment and is known to promote tumor cell migration and invasion. In this study, we investigated the clinical impact of pretreatment serum level of CXCL10 on the prognostic value of inflammatory biomarkers in 313 patients with DLBCL who were enrolled into a prospective cohort study. Serum level of CXCL10 was measured in archived pretreatment frozen samples. The high CXCL10 (>median value) group was significantly associated with high tumor burden status, including advanced stage (III‐IV), elevated serum lactic dehydrogenase, and a higher risk International Prognostic Index. Progression‐free survival of the high CXCL10 group was significantly worse than that of the low CXCL10 group, and secondary central nervous system involvement was more frequent in the high CXCL10 group. High CXCL10 was associated with high C‐reactive protein level (r  = 0.246), low albumin level (r  = ?0.289), low absolute lymphocyte count (r  = ?0.185), and risk stratification according to NLR, LMR, and GPS. C‐X‐C motif ligand 10 promoted cell migration of patient‐derived cells and several DLBCL cell lines. However, the prognostic value of high CXCL10 was lost in the multivariate analyses. Nevertheless, we suggest serum CXCL10 may have clinical value if it can be more easily assessed because of its contribution to the prognostic value of NLR, LMR, and GPS in DLBCL.