<prompt> BRCA 1 gene is located on11q13q17q19q  <response>: BRCA1 on chromosome 17q21 and BRCA2 on chromosome 13q12.3 are both large genes, and hundreds of different mutations distributed throughout their coding regions have been associated with familial breast cancers.Ref: Robbins; 9th edition; Chapter 23; The Breast; Page no: 1054 