Ribe successful miR-634 detection in RT-PCR assays [43?5]. An explanation for the discrepancy between studies could be that miR-634 is modified under certain cell-type specific conditions. Of note, modifications at the 3' end are not uncommon for microRNAs [46, 47] and may prevent miR-634 detection by RT-PCR. Therefore, in order to monitor miR-634 levels in tumors, a specific high throughput miR-6