SNAI2 and head and neck squamous cell carcinoma: SLUG protein expression in an in‐house HNSCC cohort further highlighted its association with disease recurrence, poorer response to radiotherapy, and the presence of clusters of pEMT‐type malignant cells at the edge of tumor areas (Fig. 6 and Fig. S7), which is in accordance with reports from others [34, 35, 36].