- Open Access
Cytomegalovirus infection may be oncoprotective against neoplasms of B-lymphocyte lineage: single-institution experience and survey of global evidence
Virology Journal volume 19, Article number: 155 (2022)
Although cytomegalovirus (CMV) is not considered tumorigenic, there is evidence for its oncomodulatory effects and association with hematological neoplasms. Conversely, a number of experimental and clinical studies suggest its putative anti-tumour effect. We investigated the potential connection between chronic CMV infection in patients with B-lymphocyte (B-cell) malignancies in a retrospective single-center study and extracted relevant data on CMV prevalences and the incidences of B-cell cancers the world over.
In the clinical single-center study, prevalence of chronic CMV infection was compared between patients with B-cell leukemia/lymphoma and the healthy controls. Also, global data on CMV seroprevalences and the corresponding country-specific incidences of B- lineage neoplasms worldwide were investigated for potential correlations.
Significantly higher CMV seropositivity was observed in control subjects than in patients with B-cell malignancies (p = 0.035). Moreover, an unexpected seroepidemiological evidence of highly significant inverse relationship between country-specific CMV prevalence and the annual incidence of B-cell neoplasms was noted across the populations worldwide (ρ = −0.625, p < 0.001).
We try to draw attention to an unreported interplay between CMV infection and B-cell lymphomagenesis in adults. A large-scale survey across > 70 countries disclosed a link between CMV and B-cell neoplasms. Our evidence hints at an antagonistic effect of chronic CMV infection against B-lymphoproliferation.
Although a benign infectious agent in the healthy, the human cytomegalovirus (CMV) is a notorious driver of morbidity and mortality in hematological patients with failed immunocompetence . Cytomegalovirus infection is the most significant viral complication of allogeneic hematopoietic cell transplantation (HCT) [2, 3]. The virus is highly pervasive, with a widely varying seroprevalence due to different demographic factors including socioeconomic status (SES) of populaces and communities [4,5,6].
While not regarded as a bona fide tumorigenic virus, CMV boasts an array of features that imply its oncogenic potential. The genome of CMV carries two anti-apoptotic genes, upregulates p53  and augments anaplasia in cancer cells and/or tumor-associated cells [8,9,10]. Also, CMV may contribute to cancer formation via a “hit-and-run” mechanism, as well [11,12,13,14]. Aditionally, recent studies have identified congenital CMV infection as a risk for developing childhood hematologic malignancy [15, 16].
In contrast, clinical evidence that favors an anti-limphoproliferative effect of CMV, recently came from de Carvalho Batista Éboli et al. (2022). They verified liver pretransplant positivity for CMV as a protective factor for posttransplant lymphoproliferative disorder (PTLD) in pediatric patients . A possible virus-vs-leukemia phenomenon has also been described , along with inhibition of migration of tumor cells [19, 20]. Several experiments done with murine CMV documented apoptosis in tumor cells [21, 22]. In humans, patients experiencing CMV reactivation early after allogeneic HCT for acute leukemia and non-Hodgkin lymphomas (NHL) have reduced relapse rates [23,24,25,26,27].
Research on CMV infection, reactivation, and multiorgan sequelae preferentially focuses on T-lymphocyte (T-cell) immune response. Recent studies on humanized animal models make the case in favor of importance of anti-CMV antibodies as being produced by host B-cells [28,29,30,31,32].
We asked if CMV seroststus may relate to a possible oncomodulatory role played by chronic CMV infection in individuals afflicted by lymphoid neoplasias derived from a single histologic lineage. The current work provides evidence that chronic CMV infection protects against malignant diseases of B-lymphocyte origin.
Patient and control cohorts
Our retrospective study cohort (N = 83; M/F = 43/40) was monocentric and comprised patients treated at the Clinic of Hematology, University Clinical Center, Belgrade, Republic of Serbia. The median age was 49.45 years (M = 52.3, range 20–73; F = 48.1, range 21–73). Information on demographic markers, underlying B-cell disorders, and chemoradiation regimens administered was abstracted from patients' medical records. Principal patient characteristics, diagnoses and chemotherapy regimens are presented in Tables 1 and 2. Close relatedness of malignant diseases with B-lymphocyte ontogeny was considered to have a virological authority over the clinical diversity of B-cell neoplasms.
The control group (N = 259; M/F = 73/186) consisted of population-based pauci-symptomatic noninstitutionalized civilians (mean age: 41.79 years, range: 20–86). None among the controls has had a record of malignant disease. Study cohorts differed substantially by age and gender (p < 0.001) requiring statistical matching (Table 3).
Sampling and data collection
Whole blood was a clinical source of samples collected between February and November 2017 by venipuncture using standardized clot-activator vacutainers. After clotting and centrifugation the serum fraction was screened for anti-CMV IgG and IgM antibodies at the Virology Laboratory of the Institute of Microbiology and Immunology, Faculty of Medicine, University of Belgrade. Antibody classes were determined by means of commercial anti-CMV ELISA IgG and IgM kits (EUROIMMUN AG, Lübeck, Germany), with antibody detection performed spectrophotometrically on an ELISA Reader 270 (bioMérieux, Marcy-l’Étoile, France).
Peripheral blood samples from control cohort members were profiled for the presence of anti-CMV antibodies at the Institute of Virology, Vaccines, and Sera “Torlak”, Serbian National Reference Laboratory for Viruses. Commercial kits (Enzygnost, Marburg, Germany) and a Multiskan Ex ELISA Reader (Thermo Electron Corporation, Waltham, MA, USA) were used to detect IgG and IgM classes.
Prevalence of IgG seropositivity is a hallmark of past infections in a population . Cytomegalovirus positivity was based on detection of either CMV specific IgG or both IgG and IgM in the serum indicating contact with the pathogen. All persons presenting with an antibody profile consistent with primoinfection were excluded from the study, as it was posited that there is not enough time for a B-cell malignancy to develop within a first-contact millieu.
Diseases herein studied belonged strictly to B-cell immunolymphoproliferative disorders. The diagnoses were established and morphologically code-specified according to the International Classification of the Diseases for Oncology by World Health Organization, ICD-0-3  and the 2016 revision of the World Health Organization Classification of Lymphoid Neoplasms .
In order to compare our results with available data at a global level, we interrogated published information on CMV prevalences and burden of B-cell malignancies across the globe. The PubMed advanced search was used with the search keywords "cytomegalovirus", "CMV", "B lymphoma", "Hodgkin’s disease", "non-Hodgkin lymphoma", "B acute lymphoblastic leukemia", "B chronic lymphocytic leukemia" and "myeloma", all being neoplasms of the B-cell lineage.
Incidences of B-cell malignancies were obtained from the World Health Organization Global Cancer Observatory (GLOBOCAN)  and compared to CMV prevalences from 74 countries for which this data was available . Age-adjusted annual incidence rates (/105 population) of B-cell neoplasms (standardized to the year 2000 US Census Bureau million population by the direct method) were collected and presented as sums rather than separately and apart.
It is important to note that published reports do not always clearly discriminate between B-cell and T-cell disorders. Cases of B- and T-acute lymphoblastic leukemia (B-ALL and T-ALL) were frequently presented jointly as “ALL”. B- and T-non-Hodgkin's lymphoma (B-NHL and T-NHL) were often jointly described as “NHL”. Moreover, even if B- and T-cell components of lymphoproliferative diseases were reported, complementary information on the prevalence of CMV seropositivity for each component was often not reported. Crude annual incidence rates (/105) of all B-cytopathies were summed-up in Tables 4 and 5. Merging the rates enhanced their statistical power and ease of interpretation.
Clinical sampling was approved by University Clinical Centre of Serbia, University of Belgrade Ethical Review Board. The patients signed individually a document of informed consent.
Results are presented as count (percent) or median (min–max) depending on data type. Groups were compared using non-parametric tests, Fisher's exact test for frequencies, Mantel–Haenszel chi square test for trend and Mann–Whitney U test for numeric data with non-normal distribution. Propensity score matching was performed in order to find the best matching cases in control group by age and gender. Correlation between numerical variables was performed using Spearman correlation analysis. All p-values less than 0.05 were considered significant. All data were analyzed using SPSS 20.0 (IBM corp.) statistical software.
General characteristics of the patient group are presented in Tables 1 and 2 and the comparisons between the study and control groups is presented in Table 3. Tests for IgG antibodies were successful in all patients.
CMV serostatus was relatively homogeneous across different B-cell neoplasms despite their glaring clinical diversity which ranged from acute B-ALL and aggressive B-NHL to mature B-chronic lymphocytic leukemia (B-CLL), low-grade B-NHL, and plasmocytoma (Table 1). Biological characteristics they share in common (immunophenotype and somatic mutation profiles) remain preserved in cancerogenesis such that clinical distinctiveness of B-cell neoplasms did not hamper the understanding of their virology.
Most IgG positives were patients with NHL (33/35, 94.3%) followed by B-CLL (8/9, 88.9%), and Hodgkin's disease (HD) (13/17, 76.5%). CMV was least pervasive in multiple myeloma (2/3, 66.7%) but the patients were too few. Low natural incidence of some B-cell disorders resulted in a low number of consecutive patients detected over a short interval of observation. All patients with hairy cell leukemia (2/2), Waldenström's macroglobulinemia (2/2), and non-specified B-cell lymphoma (2/2) were IgG positive. Their numbers were insufficient and were excluded from separate analyses. Positive CMV serology did not correlate among different B-lymphoproliferative diseases (p = 0.339).
The study cohorts had markedly different (p < 0.001) age and gender structure (Table 3). This required statistical matching to compensate for these discrepancies, after which there remained statistical variance for neither of variables (Table 3). Interestingly, a notable difference in CMV seropositivity emerged between the study group and normal populace after the gender/age matching was performed. The prevalence of CMV infection was significantly higher in the control group (p = 0.035), compared to the patient group (Table 3).
Binary logistic regression with B-cell malignancy as dependent and CMV serostatus as independent variable demonstrated that subjects with positive serostatus were ~ 7 times less likely (OR, 0.067; 95% CI, 0.016 to 1.150) to have a B-cell malignancy relative to seronegatives. The difference was not significant (p = 0.067), but near the conventional level of significance (0.05).
The results pointed to a potential protective effect that CMV may proffer against B-cell dyscrasia. In order to investigate our evidence on a much larger scale, we compared annual incidence rates of B-cell neoplasms to CMV prevalences in 74 countries for which these variables were available (Fig. 1A–D). Interestingly, a significant negative correlation between CMV pervasiveness and the incidence of all clinical types of B-cell malignancies was observed the world over (Fig. 1A; Spearman ρ = −0.625, p < 0.001). Similarly, an inverse association was evidenced separately for three different B-cell malignancies: HD (Fig. 1B; Spearman ρ = −0.618, p < 0.001), non-Hodgkin lymphomas (Fig. 1C; Spearman ρ = −0.617, p < 0.001), and myeloma (Fig. 1D; Spearman ρ = −0.633, p < 0.001), separately.
These results support the reality of oncoprotection by the chronic CMV infection against B-lymphomagenesis irrespective of a clinical form of a B-cell neoplasm.
This is the first study reporting on the current estimate of CMV infection in Serbian hemato-oncological patients and healthy controls. Also, our clinical results are supported by the worldwide survey of relevant data. Together, they offer the first insight into a possible connection between the chronic CMV infection and B-cell neoplasms, hinting at an oncoprotection conferred by this virus on its host.
CMV seroprevalences in patients with hematological malignancies
CMV seroprevalence varies in published studies on patients with hematological malignancies. Virus prevalence in our patient cohort (90.4%) places the Republic of Serbia among the most CMV-permeated populations in the world [37,38,39,40,41,42,43,44]. Much lower seroprevalence (70%) of anti-CMV IgG was reported in a multicenter cohort of Swedish patients (Re: Mission, NCT01347996, www.clinicaltrials.gov . The lowest CMV infestation was reported in landmark studies from the US [46, 47], a highly developed country with one of the largest incidence rates of B-cell disorders.
In studies on HCT recipients , and B-CLL patients , females were significantly more CMV seropositive. Similar to our clinical population, in Brazilian patients with various hematologic disorders females were more CMV seropositive than males albeit not significantly . On the contrary, Sudan females with leukemia were less seropositive for CMV than males . Marchesi et al.  reported largest prevalence of CMV in patients with B-CLL, and multiple myeloma which is similar to the present findings.
Inverse association between CMV seroprevalence and incidence of B-cell neoplasms across the globe
There is a stark difference in annual incidences of B-lymphoid malignancies between Western and Eastern countries [50, 51]. We try to draw attention to an inverse association between the annual age-adjusted incidences of B-cell malignancies and the spread of CMV seropositivity at a global level (Tables 5 and 6, Fig. 1A–D). Seroprevalence in presumably epidemiologically unrelated communities was frequently lower in patients with B-cell and even in other malignancies (acute myeloid leukemia, AML; chronic myeloid leukemia—CML) than that reported in voluntary blood/organ donors and in the general population . This difference is explainable if chronic CMV infection conferred a degree of protection on its immunocompetent host against B-cell malignancies. This is consistent with the evidence in the current work where healthy controls were significantly more CMV seropositive (p = 0.035; Table 3) than patients with B-cell malignancies. A potential explanation might be an increase in resistence against B-cell neoplasia fostered by primary CMV infection.
As the prevalence of CMV infection recedes across the populations, corresponding annual incidence of B-cell diseases tends to increase. For decades, incidence of lymphoid neoplasms has been globally increasing across age strata and sex. This may signify a gradual loss of protection provided by the latent CMV infection which is being globally eroded by steadily improving economic prowess and modern access to health care.
A racial/ethnic background is related to SES [52, 53]. The difference in incidence of B-lymphoid malignancies between the US and Japan is elevated, 2.5- to fivefold. The largest proportional difference between the US and Japan was in B-CLL (the US, 24.1%; Japan, 3.2%) . Annual incidence rates of B-cell neoplasms in the US-born Asians/Pacific islanders are generally intermediate to those in the US whites and East Asians; exactly parallel trend is observed in their respective CMV seroprevalences. The incidence rates of B-cell neoplasms tend to negatively parallel the prevalence of CMV seropositivity in respective populations worldwide (Fig. 1A‒D). HD and B-NHL showed the largest difference in annual incidences between the US and East Asian countries. The SES correlates with trends in age-standardized incidences of B-lymphoid disorders and is also associated with CMV infection around the world. Seroprevalence of CMV decreased in pregnant women in Ishikawa Prefecture (Japan) from 93.2% to 66.7% over the period between 1980 and 1998 and in parallel with the increase in SES . Of note, age-adjusted incidence of lymphoid malignancies in Japan increased significantly as opposed to no significant annual percent change in the US (Japan, + 2.4%; US, + 0.1%) . This may be a consequence of growing SES in Japan and the consequent drop in CMV infection there.
Global disease burden reports [36, 52, 53, 55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72] suggest a significant inverse correlation between overall estimates of CMV seropositivity and the age-standardized and population-based incidence rate of B-cell cancers (Tables 4 and 6, Fig. 1A–D). Cytomegalovirus infection decreases as contemporary economy improves and affluence is gained across societal strata. Reduced rates of CMV primoinfection in developed countries may be the cause of an increased risk of contracting a B-cell malignancy. By contrast, high CMV prevalence in countries with adverse economic conditions, appears to mitigate the risk of B-lymphoproliferative disease. In populations where the prevalence of CMV declines an oncoprotective effect of CMV subsides such that an increased annual incidence rate of B-cell cancer is observed worldwide (Spearman ρ = -0.625, p < 0.001). However, some other factor(s) may operate along with CMV infection influencing the global correlation between increasing incidence of B-cell malignancies, improving SES, and reduced country-specific prevalence of CMV infection.
Clinical and in vitro experimental evidence supporting oncoprotection by CMV
Cytomegalovirus seroprevalence was higher in the controls than in our patients with B-cell malignancies (Table 3; p = 0.035). This argues against the promotive contribution of CMV in B-cell lymphomagenesis.
Evidence in favor of viral repression of the transformation process in cancer cells has been reported . CMV inhibits the migratory capacity of mesenchymal breast cancer cell lines MDA-MB-231 and SUM1315 . Mice xenografted with CMV-infected HepG2 cells were reported to manifest limited to no tumor growth, as opposed to an unbridled tumor expansion in placebo-treated mice . A runaway tumor growth was inhibited by restricting STAT3 activation, as well as by activation of the intrinsic apoptotic pathway [74, 75]. Apoptosis was also registered in the lung tissue of xeno-engrafted mice where HepG2 cells infected with human CMV were administered subcutaneously . Erlach et al. [21, 22] proposed an innate anti-tumor mechanism elicited by murine CMV infection involving apoptosis of a liver-adapted clonal variant of B-cell lymphoma. The murine CMV infection had a highly suppressive effect on lymphoma cells even without infecting them, resulting in a significant survival benefit. Erkes et al.  also demonstrated clearance of tumors in a mouse melanoma model after CMV was inoculated into growing neoplasm. Also, an inhibiting effect of CMV glycoprotein B on breast cancer cell migration was recently documented by Yang et al..
Anti-tumor effects of CMV infection were tentatively supported by reports of reduced relapse rates in patients with CMV reactivation early after allogeneic HCT for acute leukemia and NHL [23,24,25,26,27]. Changes within the immune system caused by CMV suggest a possible virus-vs-leukemia phenomenon  analogous to graft-vs-leukemia effect in B-CLL .
A study which screened neonatal Guthrie blood spots for CMV did not find that the CMV positives contracted B-ALL more often later in life . MacKenzie et al. have screened common ALL patients and controls for presence of various herpesviruses, but were in doubt that a herpesvirus is an etiological agent in B-ALL . Another study analyzed herpesvirus DNA in Guthrie cards and found no trace of EBV or HHV-6 but CMV presence has not been assessed . Evidence garnered from these studies substantiates the assumption that CMV may forestall initiation of B-cell neoplasms.
A major strength of the present exploration is the use of a nationally representative sample to estimate CMV seroprevalence in the Republic of Serbia. Noteworthy limitations of our work are its retrospective nature and an artefact from a small sample size. Furthermore, a passive take of donor's IgG antibodies cannot be entirely excluded. This drawback to the study was mitigated by lower CMV seropositivity among blood transfusion-treated patients as compared to healthy controls.
Conclusively, we present first set of data on CMV seroprevalence based on a sample of B-cell derived malignancies in Serbia. Also, we provide evidence that prevalences of CMV are strongly inversely associated with the annual incidence rates of malignant B-cell disorders the world over. This is suggestive of a possible protective effect of CMV against the profligate B-cell growth. The cellular niche may be less favourable for initiation of B-lymphomagenesis in chronic carriers of CMV. Prospective work with a larger study size of cell lineage-specific patient cohorts across clinical and histological lymphoma subtypes may be helpful in clarifying dilemmas regarding anti/pro tumoral activity of CMV.
Availability of data and materials
The datasets generated and/or analysed during the current study are not publicly available due to safeguarding patient anonymity, but are available from the corresponding author on reasonable request.
Acute lymphoblastic leukemia
Allogeneic hematopoietic cell transplantation
Acute myeloid leukemia
Autologous hematopoietic cell transplantation
Bone marrow transplant
Center for International Bone Marrow Transplant Research
Chronic lymphocytic leukemia
Chronic myeloid leukemia
Global Cancer Observatory
Hematopoietic cell transplantation
International Agency for Research on Cancer
Middle East North Africa
Matched related donor
Matched unrelated donor
Peripheral blood HCT
Plasma cell myeloma
Posttransplant lymphoproliferative disorder
Reduced intensity chemotherapy
Surveillance, Epidemiology, and End Results
Umbilical cord blood transplantation
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The authors wish to thank all participants in this study and appreciate an excellent assistance of the attending clinical staff and services. We thank all the healthcare workers around the globe who are working hard to help humanity in the fight against the B-cell cancers. The authors owe particular gratitude and deeply appreciate the two anonymous Journal referees for their very careful review of this manuscript and insightful and constructive recommendations. They contributed valuable suggestions, enriched the substance of arguments, and improved clarity of the previous draft. We stress that our exploration is far from exhaustive. Indeed, much still remains to be learned about the antioncogenicity of CMV in various oncological settings.
We would like to acknowledge the research funding within the scope of a project under financing grants by MPNTR of the National Ministry of Education, Science and Technological Development, Projects Nos. 1750-73 and 41004. The National Ministry as funding source had no role in study design, data collection and interpretation, or the decision to submit this work for publication.
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This work was performed in accordance with principles of 1964 Helsinki Declaration and its later amendments. Approval was granted by the University Clinical Centre of Serbia, University of Belgrade Ethical Review Board and Faculty of Medicine. Guidelines of Good Clinical Practice were observed. Document of informed approval was obtained from all consenting participants included in the study. The security and privacy of patient's health was not violated in this study.
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Janković, M., Knežević, A., Todorović, M. et al. Cytomegalovirus infection may be oncoprotective against neoplasms of B-lymphocyte lineage: single-institution experience and survey of global evidence. Virol J 19, 155 (2022). https://doi.org/10.1186/s12985-022-01884-1
- B-cell malignancies