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Age-related expression of Dll1 in the vasculature of ccRCC tumours. A, Similar frequencies of Dll1-expressing capillary blood vessels in patients younger and older than 65 years. B, Lower number of Dll1-positive pre-capillary vessels (>20 μm) per hpf in patients with ccRCC > 65 years old than in their younger counterparts (P < 0.05). Median values are denoted by thick horizontal lines.
