- Letter to the Editor
- Open Access
Impaired neutralizing antibody response to COVID-19 mRNA vaccines in cancer patients
Cell & Bioscience volume 11, Article number: 197 (2021)
There is currently a critical need to determine the efficacy of SARS-CoV-2 vaccination for immunocompromised patients. In this study, we determined the neutralizing antibody response in 160 cancer patients diagnosed with chronic lymphocytic leukemia (CLL), lung cancer, breast cancer, and various non-Hodgkin’s lymphomas (NHL), after they received two doses of mRNA vaccines. Serum from 46 mRNA vaccinated health care workers (HCWs) served as healthy controls. We discovered that (1) cancer patients exhibited reduced neutralizing antibody titer (NT50) compared to HCWs; (2) CLL and NHL patients exhibited the lowest NT50 levels, with 50-60% of them below the detection limit; (3) mean NT50 levels in patients with CLL and NHL was ~2.6 fold lower than those with solid tumors; and (4) cancer patients who received anti-B cell therapy exhibited significantly reduced NT50 levels. Our results demonstrate an urgent need for novel immunization strategies for cancer patients against SARS-CoV-2, particularly those with hematological cancers and those on anti-B cell therapies.
In response to the global public health crisis caused by the COVID-19 pandemic, several SARS-CoV-2 vaccines were rapidly developed including the Pfizer/BioNTech BNT162b2 and Moderna mRNA-1273 mRNA vaccines. However, clinical trials of these mRNA vaccines did not investigate their efficacy in vulnerable populations, including immunocompromised patients. With rising vaccination rates and an easing of public health measures, there is a critical need to determine the efficacy of SARS-CoV-2 vaccination for such patients, who may experience a reduced efficacy of administered vaccines . It has already been demonstrated that organ transplant recipients, who are under immunosuppressive therapy to prevent rejection, exhibit reduced responsiveness to SARS-CoV-2 vaccination . Cancer patients represent another critical population of immunocompromised individuals who, due to the nature of the disease or to treatment with immunomodulatory therapies, may not exhibit a robust response to mRNA vaccination. A better understanding of the factors governing response to vaccination in cancer patients is critical to inform clinical decisions about the need for booster doses, the timing of vaccine administration, the need to interrupt treatment courses for vaccination, and general guidance about the level of protection achieved by vaccination in cancer patients. To this end, this study examines the neutralizing antibody response to Pfizer/BioNTech BNT162b2 and Moderna mRNA-1273 vaccination in a cohort of patients with solid tumor and hematological malignancies.
The study population included 160 cancer patients (54 chronic lymphocytic leukemia (CLL), 45 non-Hodgkin’s lymphoma (NHL), 29 lung cancer, 30 breast cancer, and 2 breast cancer with CLL) recruited through medical record screening for vaccine appointments or recent post-vaccine administration, as well as an independent cohort of 46 health care workers (HCWs), who have no history of cancer. Cancer patients had a median age of 66 years while the median age of HCWs was 38 years. No cancer patient or HCW was COVID-19 positive as confirmed by nucleocapsid-based ELISA. About 61% of cancer patients (n = 98) and 52% of the HCWs (n = 24) received BNT162b2, compared to 39% (n = 62) and 48% (n = 22) who received the mRNA-1273, respectively. We collected serum samples for 159/160 cancer patients between 31 and 232 days (median 134 days) post-second dose, and HCW serum samples were obtained at 6 months post-second dose. Cancer diagnoses and treatments of the patients are shown in Table 1. The largest treatment groups were 47 patients with B-cell malignancies (28 CLL and 19 NHL) who received B cell depletion therapy or other B cell-suppressing drugs (such as anti-CD20 monoclonal antibodies and Bruton tyrosine kinase (BTK) inhibitors) during the study period; and 46% (n = 28) of solid tumor patients received immune checkpoint inhibitors against PD-1 or PD-L1.
We assessed sera for neutralizing antibody titers using a secreted Gaussia-luciferase SARS-CoV-2-pseudotyped-lentivirus neutralization assay as previously described (Additional file 1) . Briefly, pseudotyped virus was incubated with serial dilutions of patient sera and used to infect HEK293T-ACE2 cells (BEI NR-52,511). Infected cells then secreted Gaussia-luciferase into the culture media which was harvested 48 and 72 h after infection, and luminescence was measured by a BioTek Cytation5 plate-reader. The resulting luciferase output was used to calculate a neutralization titer at 50% efficiency of maximal inhibition (NT50). To ensure valid comparisons, the serum samples of all cancer patients and HCWs were processed side-by-side in the same experiment.
We first compared the neutralizing antibody titers of cancer patients with those of HCWs. Overall, cancer patients exhibited reduced neutralizing antibody responses, with a mean NT50 of 220 compared to a mean NT50 of 522 for HCWs (Fig. 1a); this is despite the relatively shorter median time (134 days) after the second dose of vaccination for cancer patients as compared to HCWs, which is an average of ~180 days. Patients with CLL exhibited the lowest neutralizing antibody response, with over 61% (n = 34) of patients exhibiting undetectable NT50 values (below 40), compared to 49%, 31%, and 28% for NHL (n = 22), lung cancer (n = 9), and breast cancer patients (n = 9), respectively (Fig. 1b). The mean NT50 of patients with CLL and NHL (158 and 127, respectively) was ~2.6 fold lower than that of solid tumor patients (369) (Fig. 1a). Interestingly, there were a few CLL patients that exhibited high titer while none were observed for the NHL patients (Fig. 1b).
Given the common usage of B-cell depleting therapies in the treatment of hematological cancers and their likelihood of impacting vaccine efficacy, we then examined the effect of anti-B-cell therapy on neutralizing antibody response. The treatment included anti-CD20 antibodies Obinutuzumab and Rituximab, as well as BTK inhibitors Ibrutinib, Zanubrutinib, Pirtobrutinib, and Acalabrutinib. Notably, we found that CLL and NHL patients who received anti-B cell therapy exhibited 2.7-fold (p = 0.0483) and 3.1-fold (p = 0.0030) reduced neutralizing antibody response to mRNA vaccine compared to those without anti-B cell therapy, respectively (Fig. 1c).
The programmed death-1 (PD-1) receptor is an important immune checkpoint molecule that promotes exhaustion/dysfunction in chronically activated T-cells. Disruption of PD-1 or its ligand PD-L1 is a common treatment to rejuvenate T cell function in cancer patients . Given this role, we examined how anti-PD-1/PD-L1 treatments might modulate the host immune response to mRNA vaccination. However, we did not find significant differences in NT50 or development of immune-related adverse events between anti-PD-1/PD-L1 antibody-treated and un-treated lung/breast cancer patients (Fig. 1d).
Other factors potentially impacting immune stimulation were also assessed, including age and gender of patients, types of vaccine received and time of sample collection. Moderna mRNA-1273 outperformed Pfizer BNT162b2 vaccine in mean NT50 by 2.8-fold for HCWs (p = 0.0053) and 2.1-fold for cancer patients (p = 0.0044) (Fig. 1e). This is consistent with our previous findings that Moderna mRNA-1273 vaccinated individuals exhibit higher NT50 levels compared to Pfizer BNT162b2 . Given previous findings that neutralizing antibody response to mRNA vaccination is age dependent , we also examined the possible correlation between age and NT50 titer. However, no significant correlation between age and NT50 values was observed in these cancer patients (Fig. 1f). Notably, while male patients have been shown to exhibit higher NT50 levels following COVID-19 disease , we found here that female patients in fact exhibited a higher level of virus neutralization with a mean NT50 of 299 compared to 154 for males (p = 0.0116; Fig. 1g). This likely reflects an overrepresentation of older patients and patients with hematological cancers in males in our cohort (Table 1).
Given increasing concerns about declining efficacy of SARS-CoV-2 vaccines , we also examined the correlation between NT50 and time post second vaccine dose for these cancer patients. Indeed, we observed a significant, negative correlation (p = 0.0194) between time after second dose of mRNA vaccination and NT50 value (Fig. 1h). These results confirm the waning immune protection of neutralizing antibodies that are conferred by mRNA vaccination.
In summary, by using a sensitive high-throughput lentivirus-based SARS-CoV-2 neutralization assay , we have examined the neutralizing antibody response of 160 cancer patients and compared, side by side, with that of 46 healthy HCWs. We observed about an approximately 2.4-fold lower neutralizing antibody response in the cancer patients as compared to HCWs, following Pfizer/BioNTech BNT162b2 or Moderna mRNA-1273 vaccination, clearly demonstrating a reduced efficacy of SARS-CoV-2 spike antibody production among cancer patients. This, along with similar observations of some recent complementary studies , should inform the development of novel immunization strategies for cancer patients. In particular, we find that patients with hematological cancers, such as CLL and NHL, are least likely to respond to mRNA vaccination, with 50-60% of these patients showing no detectable levels of neutralizing antibody against the SARS-CoV-2 spike. Given these findings, booster vaccines may be of particular importance for these groups of cancer patients, with some studies already underway . Additionally, our finding that B cell depletion or suppression drug treatment significantly reduced the neutralizing antibody response to mRNA vaccines may indicate a need for immunization to occur during disruptions or suspensions in specific treatment protocols.
Finally, to better protect immunocompromised populations with increased risk to COVID-19, we must further investigate the duration of vaccine induced immunity as well as the efficacy of booster vaccine doses to determine how to maintain protective immunity in this patient population. Additionally, further study on quality and durability of antigen-specific T and memory B cell responses will provide a more comprehensive understanding of the immune response to SARS-CoV-2 vaccination in these immunocompromised groups. It is also critical to determine the impact of specific treatment protocols on vaccine induced immunity and immunity duration to better inform clinical decisions about the time of vaccination or boosting and the potential need for disruptions in treatment protocols. Results from this work provide critical virological and immunological information for protecting vulnerable populations (Additional file 1).
Availability of data and materials
All data and materials will be made available upon requests.
Chronic lymphocytic leukemia
Health care worker
- NT50 :
The 50% neutralizing antibody titer
Coronavirus disease 2019
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We thank members of Liu lab for sharing reagents and discussion. We also thank Donna Bucci, Jamie Hamon, Chelsea Bolyard, Kevin Weller, and Taylor Chatlos from the Immune Monitoring and Discovery Platform of the Pelotonia Institute for Immuno-Oncology for assistance in sample collection and discussion. We thank the Clinical Research Center/Center for Clinical Research Management of The Ohio State University Wexner Medical Center and The Ohio State University College of Medicine in Columbus, OH, specifically Francesca Madiai, Claire Carlin, Dina McGowan, Breona Edwards, and Trina Wemlinger, for collection, processing, and management of samples through the Cardiovascular Medicine JB Biorepository. We thank the NIH AIDS Reagent Program and BEI Resources for supplying important reagents that made this work possible.
This work was supported by a fund provided by an anonymous private donor to The Ohio State University and NCI U54CA260582 to S.-L.L. The content is solely the authors’ responsibility and does not necessarily represent the official views of the NIH. S.-L.L. was additionally supported in part by NIH R01 AI150473. Z.L. was supported by The Ohio State University Comprehensive Cancer Center Cancer Center Support Grant (P30CA016058), and multiple NIH grants (R01 DK105033; R01 AI077283; R01 CA213290; P01 CA186866; R01 CA255334; P30 CA016058). P.G.S. was supported by multiple NIH grants including NCI P30 CA016058. S.R. and Z.L. were supported by the Peletonia Institute for Immune-Oncology. R.J.G. was supported by NIH R01 HL127442-01A1, NIH U54CA260582, and the Cardiovascular Medicine JB Biorepository, and the Robert J. Anthony Fund for Cardiovascular Research. L.S. and E.M.O. were also supported by NIH U54CA260582. The Pelotonia Institute for Immuno-Oncology (PIIO) and the Immune Monitoring and Discovery Platform (IMDP) are funded in part by the Pelotonia community and the Ohio State University Comprehensive Cancer Center (P30CA016058).
Ethics approval and consent to participate
The study was carried out with the consent approval from participants under approved IRB protocols 2021C0041, 2020H0228 and 2020H0527 at The Ohio State University.
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All coauthors have agreed to publish the results of this study.
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Zeng, C., Evans, J.P., Reisinger, S. et al. Impaired neutralizing antibody response to COVID-19 mRNA vaccines in cancer patients. Cell Biosci 11, 197 (2021). https://doi.org/10.1186/s13578-021-00713-2