ABSTRACT
OBJECTIVES: This study aimed to evaluate the safety and immunogenicity of inactivated COVID-19 vaccines in patients with gastrointestinal cancer (GI) cancer. The role of memory B cells (MBCs) in the humoral response to COVID-19 vaccination was also investigated. METHODS: In this prospective observational study, GI cancer patients and healthy individuals who had received 2 doses of inactivated COVID-19 vaccines were included. The data regarding adverse effects, serum anti-receptor binding domain (RBD)-IgG, neutralizing antibodies (NAbs), and frequencies of MBCs were collected prospectively. RESULTS: The inactivated COVID-19 vaccines were safe and well tolerated. Serum anti-RBG-IgG and NAbs were lower for cancer patients. Old age, high ASA score, and receiving active chemotherapy were risk factors for lower antibody titers. The frequencies of activated and resting MBCs decreased in (17.45% vs 38.11%, P = 0.002; 16.98% vs 34.13%, P = 0.023), while the frequencies of intermediate and atypical MBCs increased in cancer patients (40.06% vs 19.87%, P = 0.010; 25.47% vs 16.61%, P = 0.025). The serum antibody titer decreased gradually during follow-up but increased when a booster vaccine was given. CONCLUSION: The inactivated COVID-19 vaccines were well tolerated in patients with GI cancer but with lower immunogenicity. The subpopulations of MBCs were disordered in cancer patients, and a booster vaccine may be prioritized for them.
Subject(s)
COVID-19 Vaccines , COVID-19 , Gastrointestinal Neoplasms , Humans , Antibodies, Neutralizing , Antibodies, Viral , COVID-19/prevention & control , COVID-19 Vaccines/immunology , Gastrointestinal Neoplasms/chemically induced , Immunoglobulin G , SARS-CoV-2 , Vaccines, Inactivated/immunology , Immunogenicity, VaccineABSTRACT
The title compound, C(17)H(15)NO, exists in a Z conformation. The dihedral angle between the O-bonded benzene ring and the vinyl plane is 80.97â (18)° while the dihedral angle between the rings is 80.06â (10)°. In the crystal structure, no classical hydrogen bonds occur.
ABSTRACT
In the title mol-ecule, C(13)H(13)N(3)O(2)S, the pyridine and pyrimidine rings form a dihedral angle of 3.8â (1)°. The crystal packing exhibits weak inter-molecular C-Hâ¯O hydrogen bonds.
