STAT3 and breast angiosarcoma: qPCR analyses showed that knockdown of STAT3 reversed the BA‐induced transcriptional changes of genes, previously assigned as BA‐induced ‘mRNA oncogenic phenotype’ and linked to malignant transformation of murine hypopharyngeal mucosa caused by BA and HNSCC2, 4, 7, 8, 9, 11, 12, 13, 26, 27, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41 (Figure 4).