There were no difference of serum CCL19 concentration between difference age groups (mean concentration: 1.439 ng/ml in age over 60 years vs. 1.823 ng/ml in age less than 60 years, p = 0.468), Follicular Lymphoma International Prognostic Index risk groups (mean concentration: 2.122 ng/ml in low-risk group vs. 1.578 ng/ml in intermediated-group vs. 1.070 ng/ml in high-risk group, p = 0.348) and rituximab maintenance groups (mean concentration: 1.165 ng/ml in maintenance group vs. 1.578 ng/ml in no maintenance group, p = 0.278) (Fig. 5a–c). This evidence concerns the gene CCL19 and follicular lymphoma.