Intratumoral rhIL-12 administration in head and neck squamous cell carcinoma patients induces B cell activation

International Journal of Cancer. Journal International Du Cancer
Carla M van HerpenPieter H de Mulder

Abstract

The objectives of this study were to investigate the effects of intratumorally (i.t.) administered recombinant human interleukin-12 (rhIL-12) on the distribution and function of B cells in the primary tumors, the locoregional lymph nodes and peripheral blood of head and neck squamous cell carcinoma (HNSCC) patients. The initial characterization of the patients participating in the phase Ib and phase II studies has previously been reported. After rhIL-12 treatment, fewer secondary follicles with a broader outer region of the mantle zones and an increase in interfollicular B-blasts were seen in the enlarged lymph nodes compared with control HNSCC patients. The size of the germinal center (GC) was diminished, partly due to a decrease in the number of CD57+ GC cells that have been associated with immune suppression. These changes did not correlate with signs of apoptosis or CXCR5 expression by B cells. Strikingly, in 3 out of 4 IL-12 treated patients, increased IFN-gamma mRNA expression by B cells was detected. In addition, a highly significant IgG subclass switch was seen in the plasma with more IgG1, less IgG2 and more IgG4, indicating a switch to T helper 1 phenotype. Finally, peritumoral B cell infiltration was a positive progn...Continue Reading

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