The lymphoma risk, especially the primary CNS lymphomas, has significantly decreased, in the era of combination anti-retroviral therapy (cART) [7]. An

over-risk for non-Hodgkin lymphomas (NHL) still remains in HIV-infected patients [8] and [9]. Defective T-cell immunity in patients has previously been shown to result in an abnormally high number of EBV-infected B cells in blood, e.g. in chronic active EBV infection, post-transplant patients and in HIV-infected patients MAPK Inhibitor Library high throughput [10] and [11]. Vaccination including adjuvant may affect the EBV-host balance, especially in immunocompromised individuals, e.g. those with HIV-1 infection as it affects HIV-1-, EBV-, CMV- and/or HCV-specific CD4 T-cells [12] and [13]. This vaccination effect on specific CD4 T-cells might in turn also affect the B-cell compartment [14] and [15]. Trichostatin A A history of symptomatic primary HIV-1 infection (PHI) is also known to affect the composition of the B-lymphocyte pool [16]. In this paper we analyse subgroups of non- or

insufficiently antiretroviral treated HIV-infected patients and their EBV-host relation measured by EBV genome load. Vaccination with recombinant HIV-1 gp160 (rgp160)/adjuvant and symptomatic primary HIV-infection (PHI) both affects B-cell function. We show an increased EBV-load in blood B-cells after therapeutic vaccination and a further enhancement of EBV-DNA in patients with a history of PHI. Sixty HIV-1 positive patients from the outpatient clinic at Huddinge hospital and/or South Hospital, Stockholm, including 42 participants in vaccine trials were randomly selected for this study (Table 1 and Table 2). After informed consent 20 mL of blood was collected. HIV-1 negative controls (not matched for age, sex or risk group) were selected among healthy laboratory personnel. Permission for the study was obtained from the regional Ethical Committee at the Karolinska Institute (#51/97). Of the 42 immunised individuals, 32 participated for two years in a double blind placebo controlled phase III vaccine trial with r160 (rgp160)/”placebo” [17]. Both

in the rgp160 vaccine and placebo arm alum was included as adjuvant. In this early vaccine trial patients received at least eight vaccinations with alum/rgp160 Non-specific serine/threonine protein kinase at regular intervals for 21 months. Placebo was given according to the same time schedules. The other 10 patients were during more than three years included in an on-going open phase II clinical study with the same vaccine. These patients got 12–16 vaccinations during three years. The patients were treated during the pre-HAART/cART era with one or two nucleoside analogues or foscarnet. We designate this treatment regimen as insufficient antiretroviral therapy, as indicated both by CD4 counts and breakthroughs of HIV RNA levels. Sex, age, patient origin, route of transmission, CD4+ and CD8+ cell counts are summarised in Table 1.