A study conducted in Germany contradicts at least two earlier studies that found a link between prostate tumors and a virus seen in some tumors. Researchers led by Drs. Reinhard Kurth and

Norbert Bannert of the Robert Koch Institute in Berlin studied 589 prostate-tumor samples collected in Germany. The team reported Thursday in the journal Retrovirology that they found no

traces of the xenotropic murine leukemia virus-related virus, or XMRV, in any of the samples.