ERVW-1 and seminoma: On average, 9.9 (SD 1.7) proviruses were found expressed per seminoma sample, with 8.8 (SD 1,6), 10.7 (SD 1.2) and 11.5 (SD 0.7) proviruses found in samples from patients with antibodies against HML-2 Gag and Env, against Env and without antibodies, respectively.