ARID1A expression was detected in type II GCT tissues (GCNIS, seminomas, ECs, teratomas) and cell lines (TCam-2 (seminoma), 2102EP, NCCIT (ECs), JAR (choriocarcinoma)), while ARID1B expression was expressed considerably weaker (Figure 1A). The gene discussed is ARID1B; the disease is choriocarcinoma.