In immunocompetent patients, chronic inflammation precedes HBV-mediated oncogenesis. Recent studies have implicated T cells, especially Tc cells, but only in the HBV chronic process ([
24]). Tc cell activation and IFNα2 secretion may be crucial in acute inflammation ([
25]). However, since IFN-α2 was positively related to the frequency of CD8+ T lymphocytes in acute inflammation, the low level of these cells in our patient affected the innate immune response. On the contrary, viral clearance classically is monitored by serological conversion in patients infected with HBV (i.e. humoral and B-cell compartment). Viral clearance was difficult in our patient because it was associated with the HBV-specific adoptive immunity, damaged in CVID. The only indirect sign of a significant influence of B cells and humoral mechanisms on the fulminant course of HBV infection is the data from rituximab treatment, i.e. B-cell depletion therapy (14, [
26]), which is overused in mild complications of CVID (2). Interestingly, using the EUROclass system ([
27]), our patient was classified into the group with nearly absent B cells (less than 1%). Although coagulation disorder was present in 79% of patients with CVID-liver disease cohort, the immunosuppressive (B cell ablation therapy, cytostatics) was used for therapeutic regimen (2). Vaccination and a high level of anti-HBs do not protect such patients from fulminant disease, because the lymphatic system is overloaded with immune complexes, lymphoma (treated with rituximab) and the B-cells are eliminated for long time. Rituximab eliminates B cells (also B cell compartment in spleen and lymphatic system), causes antibody-dependent cell-mediated cytotoxicity (ADCC) with C4 complement consumption and prompt a fulminant process, also without lymphoma ([
28]). From the perspective of our patient and CVID, cooperation of B cells in the follicles seems crucial, since HBV replication and HBsAg secretion proceeded extremely dynamically (
Figure 1), despite the passively maintained anti-HBs (in "protective titer"). Last communication shows genetic and epigenetic mechanism and abnormal immunity, selected dysregulated interactions between B cells and the other immune cell compartments in the CVID ([
29]). A similar danger is posed by LT associated with deep immunosuppression, with anti-thymocyte globulin or anti-IL-2 receptor antibody as well as calcineurin inhibitors, used in transplant procedure in 2.4%, 9.7 and 93.8% patients respectively (18).Lack of specific immunoglobulin, immune response under the influence of antigen stimulation and B cell in our patient is very suggestive (
Table 1). Interestingly, also the FcγRIII (CD16) is underexpressed on lymphocytes (i.e. 5.2% -
Table 1), particularly on large granular lymphocytes (LGLs) of both NK- and CD8-positive T-cell (i.e. 50.4 and about 17 cells/μl, respectively). Furthermore, this low expression may be a mechanism exacerbating HBV-related state of CD8CD103-positive lymphocyte exhaustion in HCC (5), therefore cause of fulminant course. As ADCC activation with IgG/FcγRIII activation in LGL was damaged, one of the crucial mechanisms of passive immunization and antiviral immunity in our patient was significantly low. As in the T cells, NK cells induce IFNγ and TNFα gene transcription and cytokine mRNA. Interestingly, in NK cells the signal is calcium-dependent and mediated by a cyclosporin A (CsA)-sensitive NFATp (the nuclear factor of activated T cells) ([
30]). The reduction of CD16 under the influence of CsA in transplant practice may cause a similar defect as in our patient with CVID. Adequate cellular compartment with positive delayed-type hypersensitivity in Mantoux test, normal CD4 level was not compensatory for the humoral and LGL defect. This is one of the problems with immunotherapy, which is high risk for CVID patients with unknown benefits (abnormal immune response). The lack of cause eradication (viral clearance and HBV-oncogenesis) is significant in our case. Therefore, incorporation of HBV-DNA into the host's genome may initiate malignant transformation, even in the absence of chronic hepatitis or abnormal ALT. The viral genome incorporation and oncogenesis is beyond the action of IgG. Although the level of CD8 T cells was reduced by about half to normal (i.e. 128 cells/μl), LGL T cells were significantly deficient among these cells, i.e., 17 cells/μl (data not shown). Thus, the observed changes in CVID gave a specific niche for the abundant multiplication of the virus and fulminant oncogenesis. HBx oncoprotein in complex humoral disorders, the lymphatic system overload with immune complexes, caused HCC in many mechanisms in an uncontrolled manner with fast growth (
Figure 1) ([
31]). Both the proliferation associated with cyclins, MAPK, JAK/STAT3.5, PI3K/NFkB signaling pathways and the disruption of apoptosis (p53), regardless of the increase in viral infectivity, are intermediate are associated with intensive oncogenesis and death without cirrhosis in the observed case ([
32]).
Cellular (hepatocyte) transplantation may be a much safer option than non-selective harvest donors ([
33]). So far, despite the wealth of literature, oncological research has been focused on genetic issues or T cell compartment estimation in immunotherapy. The role of B cell immunosurveillance against oncogenic viruses is underestimated, especially against HBV in CVID(2,5). What is noteworthy is that the TNF gene family (e.g. transmembrane activator and calcium modulator and cyclophilin ligand interactor (TACI) is a crucial regulator of B cell receptor activation and such mutation is frequently identified in CVID patients ([
34]). However, the earliest effect of TNF discovered was to inhibit tumor growth. Interestingly, lymphoma is most frequently diagnosed in CVID, but solid tumors, especially under influence of oncogenic viruses, are not considered, patients usually receive B-cell depletion therapy (2,35). Although CVID patients with liver disease most frequently presented with abnormal liver function test and abnormal abdominal ultrasound (68%) (2), in the initial stage of HCC, nodular changes are similar to nodular regenerative hyperplasia (
Figure 2a), treated with rituximab (2). Lymphoproliferative disease development in patients with primary immunodeficiency requires a different investigative approach to immunotherapy ([
35]). Our observation showing other humoral elements, including ADCC, LGL and the complement cascade, is a good introduction to further observations and change of existing immunotransplantation practice. Humoral immunity and complex of B cell interaction cannot be replaced by passive immunization and the administration of specific immunoglobulins ([
36]). Normal aminotransferase levels as a satisfied results together with lack of agreement on frequent imaging and HBV testing as well as tumor markers overlooking constitute a significant gap in the oncosurveillance against HCC in immunodeficiency (2). Our case demonstrates the need for fast surgical interventions and targeted biopsies.