COVID-19(28) Patient(20) receiving(15) COVID-19 vaccine(13) Analysis(10) Protective(10) clinically(10) Cell(10) Treatment(10) lymphoma(10) conducted(10) Vaccine(10) Antibody Response(10) Japan(10) vaccination(8) Antibody titer(8) mRNA(8) antibody(8) SARS-CoV-2 vaccination(8) B-cell(8) treated(8) Efficacy(8) Chemotherapy(7) COVID-19 vaccination(7) patients(7) therapy(7) Prevalence(7) SARS-CoV-2(7) Immunoglobulin(6) mRNA vaccine.(6)