The correlation between the SUVmax, TLG and MTV of thymic lesions obtained on 18F-FDG PET/CT scans and the expression of Ki-67 on immunohistochemistry was tested by linear regression analysis, which shows no significant correlation between them in patients with thymic MALT lymphoma (r = 0.355, P = P = 0.49), (r = 0.87, P = 0.13), (r = 0.84, P = P = 0.16) (Figure 3). The gene discussed is MKI67; the disease is MALT lymphoma.