Although some studies have found CtIP/RBBP8 to be mutated in tumor samples [18–21], and some general screenings using RT-polymerase chain reaction (PCR) have found changes in its mRNA levels (Oncomine), we describe here the first systematic study of the presence of CtIP/RBBP8 at the protein level. Here, RBBP8 is linked to neoplasm.