While CSPG4 IgE triggered significant degranulation in the presence of WM1366 cells expressing intermediate levels of CSPG4, the antibody did not trigger degranulation in the presence of low target-expressing WM1361 cells or non-CSPG4-expressing SKBR3 breast cancer cells (Supplementary Fig. 5). This evidence concerns the gene CSPG4 and breast cancer.