ATCC cell line <a href="http://www.atcc.org/SearchCatalogs/longview.cfm?view=ce,4910459,HTB-26&text=HTB%2D26">HTB-26</a>. Breast adenocarcinoma derived from pleural effusion in a 51 year old female. The cell line is aneuploid female, with chromosome counts in the near-triploid range. Normal chromosomes N8 and N15 were absent. Eleven stable rearranged marker chromosomes are noted as well as unassignable chromosomes in addition to the majority of autosomes that are trisomic. Many of the marker chromosomes are identical to those shown in the karyotype reported by K.L. Satya-Prakash, et al.