Example 8
The inventors have analyzed the Teg numbers and the expression of ICOS on Treg in LNH samples. Fresh lymphoma cells teased from lymph nodes were collected from 45 patients with informed consent. Lymphoma samples correspond to Hodgkin disease (HD, n=11), follicular lymphoma (FL, n=13), diffuse large B cell lymphoma (DLBCL, n=10), mantle cell lymphoma (MCL, n=5) and marginal zone lymphoma (MZL, n=6). Detection of Treg cells was performed by incubation for 20 min at 4° C. with anti-ICOS-PE (Becton Dickinson™), anti-CD3-ECD, anti-CD4-Pacific Blue (Beckman Coulter®), anti-CD127 FITC, anti-CD25 APC-Cy7 and LIVE/DEAD® Fixable Dead Cell Stain Kit (Invitrogen™). After staining, each cell preparation was washed twice in PBS, fixed with 2% paraformaldehyde and analyzed on a FACS LSR2 flow cytometer (Becton Dickinson™). Data were analyzed using FlowJo Software (TreeStar™). Treg were increased in all lymphoma samples except HD. Most of Treg displayed an increased expression of ICOS in comparison to control lymph nodes (