HOTAIR and ovarian cancer: We analyzed HOTAIR expression in 134 primary ovarian cancer samples (INNSBRUCK) and found that 72 were positive and 62 were negative for HOTAIR. Consistent with our findings that only a subset of cells may express HOTAIR in ovarian cancer tissue, the cycle threshold (ct) values in the positive samples were very low (mean ct 37.4) compared with the TBP reference gene (mean ct 27.4).