We conclude that NPM/ALK fusion genes are present in peripheral blood cells of healthy donors.     ///    "To further delineate the relevance of this finding for HD, we studied the occurrence of NPM/ALK fusion genes in peripheral blood cells of healthy donors by RT-PCR. "    ///    Detection of the t(2;5)-associated NPM/ALK fusion cDNA in peripheral blood cells of healthy individuals..     ///    "Due to the low rate of NPM/ALK-positive cells in the peripheral blood of positive individuals, an assignment to a defined cellular subpopulation was not possible. "    ///    Our group recently demonstrated NPM/ALK fusion cDNAs by single-cell RT-PCR in < 3% of CD30+ tumour cells in 2/9 cases of HD.     ///    NPM/ALK fusion cDNAs were found by RT-PCR in 14/29 healthy individuals and confirmed by hybridization with a breakpoint-specific oligonucleotide. 