NF1 and neoplasm: The results (Table 2) showed that the NF1 protein expression was associated with the tumor size (x2 = 7.372 and p = 0.007), distant metastasis (x2 = 9.378 and p = 0.002), and recurrence (x2 = 4.300 and p = 0.047), but NF1 was not associated with gender, age, lymph node metastasis, location, or 5-year survival.