Syncytin-2, a member of the HERV-FRD family, takes part in the placenta expression cluster [72], [49], [73] and numerous envelope and capsid elements related to the HERV-K HML-2 family formed the testicular tumor group as described previously [2], [74], [75], [19], [76]. Here, CLEC10A is linked to neoplasm of testis.