FGFR1 and skin hemangioma: Based on the staining intensity, FGFR1 expression was divided into four levels (0, 1, 2 and 3): 0, negative expression of FGFR1 in infantile skin hemangioma tissues; 1, weakly positive expression of FGFR1; 2, moderately positive expression of FGFR1; and 3, strongly positive expression of FGFR1.