This study investigates whether donors with previous exposure to COVID-19 can pass their immunity by hematopoietic (blood) stem cell transplant (HCT) donation to patients that have not been exposed. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is the virus that causes the COVID19 infection. This study may provide critical information for medical decision-making and possible immunotherapy interventions in immunocompromised transplant recipients, who are at high risk for COVID19 severe illness.
PRIMARY OBJECTIVE: I. To establish the possibility of anti-SARS-CoV-2 adaptive immunity transfer from matched related (MRD) or unrelated (MUD) HCT donor to HCT recipient. SECONDARY OBJECTIVES: I. To explore anti-SARS-CoV-2 adaptive immunity transfer in the haploidentical (haplo) HCT setting. II. To assess the prevalence and change over time of SARS-CoV-2 seropositive donors among all consented donors. OUTLINE: DONORS: Prior to HCT, sibling donors (MRD and haplo) undergo a nasopharyngeal swab per standard of care for SARS-Cov-2 testing. For MUD donors, initial testing may consist of a questionnaire. All donors undergo collection of blood and saliva at the time of granulocyte-colony stimulating factor (G-CSF). Donors' medical charts are also reviewed. RECIPIENTS: Patients undergo a nasopharyngeal swab for SARS-Cov-2 testing at 30, 60, 90, 120 days post-HCT, and afterwards as deemed necessary by the treating physician. Patients also undergo the collection of blood and saliva specimens at days 30, 60, 90, 120, 150, and 180 post-HCT. Recipients' medical charts are also reviewed.
Study Type
OBSERVATIONAL
Enrollment
26
Undergo collection of nasopharyngeal swabs, blood, and saliva samples
Correlative studies
Medical charts are reviewed
Complete questionnaire
City of Hope Medical Center
Duarte, California, United States
Severe acute respiratory syndrome (SARS)-Coronavirus 2 (CoV-2) Spike protein (S)-specific IgG concentration and T cell levels
Testing for SARS-CoV-2 antibodies will be performed on serum samples using in house developed enzyme-linked immunosorbent assay (ELISA). The qualitative assays will be developed to investigate Spike subunit 1 (S1)-specific antibodies of the IgG, IgM and IgA subclasses in serum and saliva samples. All SARS-Cov-2 seropositive donor-HCT recipient pairs patients will undergo cellular immunogenicity evaluations using flow cytometry. The data analysis for estimating the effect of donor immunity transfer on functional cellular immunity through time will be exploratory in nature and will focus on graphical display and summary statistics. Longitudinal levels of T cells specific for SARS-CoV-2 S will be measured as a correlate of immunity transfer efficiency.
Time frame: Up to 180 days post-hematopoietic stem cell transplant (HCT)
SARS-CoV-2 nucleocapsid protein (N) -specific IgG concentration and T cell levels
Testing for SARS-CoV-2 antibodies will be performed on serum samples using in house developed ELISA. The qualitative assays will be developed to investigate nucleocapsid (N)-specific antibodies of the IgG, IgM and IgA subclasses in serum and saliva samples. All SARS-Cov-2 seropositive donor-HCT recipient pairs patients will undergo cellular immunogenicity evaluations using flow cytometry. The data analysis for estimating the effect of donor immunity transfer on functional cellular immunity through time will be exploratory in nature and will focus on graphical display and summary statistics. Longitudinal levels of T cells specific for SARS-CoV-2 N antigens will be measured as a correlate of immunity transfer efficiency.
Time frame: Up to 180 days post-HCT
SARS-CoV-2 neutralizing antibodies
Evaluation of SARS-CoV-2 neutralizing antibody titers in serum samples will be performed using SARS-CoV-2 lentiviral-pseudovirus based on published protocols. Spike incorporation into the pseudovirus will be verified and quantified by western blot using Spike-specific antibodies (Sino Biological) and by ELISA using Spike Detection kit (Sino Biological), respectively.
Time frame: Up to 180 days post-HCT
SARS-CoV-2 IgA concentration
Testing for SARS-CoV-2 antibodies will be performed on serum samples using in house developed ELISA.
Time frame: Up to 180 days post-HCT
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