GPC3 and neoplasm: Among the 3 patients who had two tumor samples included in the TMA (primary tumor and lymph node metastasis), GPC3 expression was concordant between the primary tumor and the lymph node metastasis in two cases (both positive, n = 1; both negative, n = 1) and discordant in one case, where GPC3 expression was negative in the primary tumor and positive in the lymph node metastasis.