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Correlation between QD-based IHF and conventional IHC. (a) Aldehyde dehydrogenase 1 (ALDH1A1)-positive tumour; (b) ALDH1A1-negative tumour; (c) Correlation between ALDH1A1 expression levels measured by immunohistochemistry (IHC) and by QD-IHF. Calculated using Spearman’s rank correlation. (d) Box-Plot for ALDH1A1 in non-metastatic and metastatic groups. Reprinted with permission from ref. [272].
