SDC1 and neoplasm: In human melanoma, phenotypic analysis showed that the tumor microenvironment contains CD20+ TAB (reviewed in Ladányi, 2015) and CD138+ or IgA+CD138+ ASC, which are primarily found at the invasive tumor-stroma margin (Erdag et al., 2012; Bosisio et al., 2016; Griss et al., 2019).