PSMD1 and cancer: Although we found good concordance between the presence of anti-S1 IgG antibodies and NAbT against WT SARS-CoV-2 in our cohort (in line with reports in those without cancer)34–36, seroconversion was a poorer surrogate for NAbT against VOCs, where approximately half the patients without detectable NAb against Delta had anti-S1 IgG antibodies.