Figure S1. Histological grading of oral squamous cell carcinomas. Representative images of well-differentiated, moderately differentiated and poorly differentiated squamous cell carcinomas. Magnification, ×40.

Figure S2. Expression of ALDH1, SOX2 and Ki67 in human normal oral mucosa. Magnification, ×40 (left panel), ×200 (right panel).

Figure S3. Expression of ALDH1, SOX2 and Ki67 in human oral carcinomas. Representative ALDH1 low case (0%, left panel) and ALDH1 high case (30%, right panel), SOX2 peripheral staining pattern (left panel) and SOX2 diffuse staining pattern (right panel), and Ki67 low case (3%, left panel) and Ki67 high case (60%, right panel) are shown. Magnification × 40.

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