Functional immune responses against SARS-CoV-2 variants of concern after fourth COVID-19 vaccine dose or infection in patients with blood cancer

Cell Rep Med. 2022 Oct 18;3(10):100781. doi: 10.1016/j.xcrm.2022.100781. Epub 2022 Sep 27.

Abstract

Patients with blood cancer continue to have a greater risk of inadequate immune responses following three COVID-19 vaccine doses and risk of severe COVID-19 disease. In the context of the CAPTURE study (NCT03226886), we report immune responses in 80 patients with blood cancer who received a fourth dose of BNT162b2. We measured neutralizing antibody titers (NAbTs) using a live virus microneutralization assay against wild-type (WT), Delta, and Omicron BA.1 and BA.2 and T cell responses against WT and Omicron BA.1 using an activation-induced marker (AIM) assay. The proportion of patients with detectable NAb titers and T cell responses after the fourth vaccine dose increased compared with that after the third vaccine dose. Patients who received B cell-depleting therapies within the 12 months before vaccination have the greatest risk of not having detectable NAbT. In addition, we report immune responses in 57 patients with breakthrough infections after vaccination.

Keywords: COVID-19; SARS-CoV-2; T cells; blood cancer; neutralizing antibodies; variants of concern.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antibodies, Neutralizing
  • Antibodies, Viral
  • BNT162 Vaccine
  • COVID-19 Vaccines* / immunology
  • COVID-19* / prevention & control
  • Clinical Studies as Topic
  • Humans
  • Immunity
  • Neoplasms*
  • SARS-CoV-2

Substances

  • Antibodies, Neutralizing
  • Antibodies, Viral
  • BNT162 Vaccine
  • COVID-19 Vaccines

Supplementary concepts

  • SARS-CoV-2 variants

Associated data

  • ClinicalTrials.gov/NCT03226886