AR and metastatic malignant neoplasm in the lymph nodes: In a multivariate analysis to select independent factors for determining tumors of low SUVmax (cutoff 10.3, median value of SUVmax), AR expression was selected as a significant factor for determining SUVmax (P = 0.012), along with tumor size (P < 0.001), presence of lymph node metastasis (P < 0.001), and histologic grade (P < 0.001) (Table 4).