Tissues were fixed with 4% paraformaldehyde before being placed in paraffin. 5-μm sections were placed on the glass slide and stained for METTL3, E-cadherin, vimentin, or ZBTB4 (Solarbio Life Science, China) based on the manufacturer’s guidelines to detect the levels of METTL3, E-cadherin, vimentin, and ZBTB4. Quantitative IHC staining with the immunohistochemical score (IRS) system was as described previously.53 (link)
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