SLC34A2 and neoplasm: After adjustment for significant factors affecting DFS (i.e., age group, lymph node involvement at presentation, capsular invasion, extrathyroid extension, tumor stage, tumor size, and SLC34A2 IHC expression) by backward Cox regression analysis, lymph node status at presentation, SLC34A2 IHC expression, and age were identified as independent factors affecting DFS (Table 4).