RBBP8 and neoplasm: We detected three different CtIP/RBBP8 levels (Fig. 1): level 0 contained samples in which no CtIP/RBBP8 could be detected with the antibody; level 1 represented an intermediate level; and level 2 corresponded to samples with a clear nuclear signal of CtIP/RBBP8 in more than 90% of the cells of the tumor.