ZEB1 and synovial sarcoma: We found loss of genetic material (defined as −2.0 < Log2 values ≤ −0.3) for about 35% (15/43) of SS cases and 3 cell lines, homozygous DNA deletions (defined as Log2 value ≤ −2.0) in ~9% (4/43) of SS patients, one case (P28) of uniparental disomy (UPD, i.e., a deletion followed by a re-duplication of the remaining allele3), for a total of about 46.5% (20/43) of patients, and 3 cell lines affected by ZEB1 locus abnormalities (Table 1).