Results
1, clinicopathologic characteristics
There were 70 patients enrolled in this study. As list in Table 1, the PD-L2 expression was positive in 41 patients (58.6%) and negative in 29 patients (41.4%). A positive expression was shown in Fig 1. The mean PD-L2 expression scores was 70.8. Table 1 shows the clinicopathologic characteristics of these patients. The mean age was 49. 60% of patients were male. And the mean tumor size was 5.35cm. B1 (17.1%) and B2 (44.3%) dominated the WHO pathologic type. Most of the patients were diagnosed with Masaoka-Koga stage I (71.4%). 33 patients (47.1%) were also MG patients.