Peripheral blood lymphocyte/monocyte ratio following completion of first-line therapy predicts early relapse in patients with diffuse large B cell lymphoma

To investigate whether the post-therapy lymphocyte/monocyte ratio (ALC/AMC ratio or LMR) predicts early relapse in patients with diffuse large B cell lymphoma (DLBCL), we enrolled 125 consecutive patients with DLBCL and followed up from 2005 to 2015 in our hospital. The LMR was measured following completion of first-line therapy. We found that the LMR following completion therapy was a strong predictor of early relapse, which is less than 12 months after diagnosis. A low LMR was significantly associated with early relapse in both univariate [odds ratio (OR) = 8.8; P = 0.006] and multivariate analysis (OR = 8.951; P = 0.011). The low-LMR group (<2.9) had poorer outcomes than the high-LMR group (≥2.9), with a lower 2-year progression-free survival rate (78.9 versus 97.1 %, P = 0.002) and 2-year OS rate (82.5 versus 98.5 %, P = 0.002). This study suggests that a lower LMR following completion of first-line therapy can be used as a marker to predict early relapse in patients with DLBCL.