**5. Future directions**

Use of breast cancer cell lines as models of breast disease will not diminish in the near future. These cell lines are an excellent resource to test novel hypotheses and to gain greater understanding about how cells work and how breast cancer can be treated. On the whole, the established cell lines are a good model for disease, however additional cell lines should be created. The addition on new lines, especially those derived from various forms of breast cancer will only strengthen the data gleaned from them. Likewise, cell authentication should become a routine part of experimental procedures. By periodically ensuring the cell lines being tested are truly the correct lines will eliminate the generation and publication of false data. Authentication will save money and potentially careers if done of a routine basis.
