NT5E and metastatic malignant neoplasm in the lymph nodes: In the stratified survival analyses, high expression of CD73 was also a predictor for decreased recurrence-free survival in subgroups of PTC patients with extrathyroidal extension (n = 368, p = 0.042, Figure 2B) and lymph node metastasis (n = 312, p = 0.044, Figure 2C).