NCIt definition : Any rearrangement to the genomic content that results in the loss of one or more nucleotides
of DNA. Deletions are generally irreversible rearrangements. They may alter the reading
frame of a gene, or may result in loss of large chromosomal regions.;
Alternative definition : NCI-GLOSS: Absence of a segment of DNA; may be as small as a single base or as large
as a whole chromosome.;