PLAGL1 isoforms were biallelically expressed in multiple AML cell lines (18 isoforms) and monoallelically expressed in colorectal cell lines (22 isoforms), whereas this gene had isoform-specific allelic patterns in head and neck tumor cell lines, with 5 monoallelically and 10 biallelically expressed isoforms (Additional file 17: Table S9; Additional file 19: Table S10). This evidence concerns the gene PLAGL1 and head and neck neoplasm.