A representative ELISPOT is shown in Fig. 1A. Specifically, T‐cell responses to MAGE‐A1 were detected in 17% (1/6) and 31% (9/29) of patients with mixed germ cell tumors (mGCT) and seminoma respectively but were absent in patients with non‐seminomatous germ cell testicular tumors (NSGCTT) (Fig. 1B). This evidence concerns the gene MAGEA1 and mixed germ cell tumor.