Bulk tumour gene expression analysis showed the BCR heavy chain isotype expression was, in order of abundance, IgG>IgA>IgM>IgD, measured in the TCGA SKCM RNA‐seq data (Cancer Genome Atlas, 2015; Selitsky et al., 2019); these samples spanned all stages of CM disease and outcomes. This evidence concerns the gene BCR and neoplasm.