It is mixed - some papers report AR expression in the 231 cells ;

e.g. PMID 20697531

and some do not.

e.g. http://www.nature.com/onc/journal/v30/n42/fig_tab/onc2011144f2.html

PMID - 21633166

It may depend on splice variants;

https://link.springer.com/article/10.1007%2Fs12672-014-0171-4

PMID 24570075

Although it seems that there is not a current consensus.

Thank you very much!

I will read your attachment carefully!

MDA-MB-231 cells are sensitive on our steroidal compounds. These compounds decrease cells proliferation, but do not induce apoptosis or changes in the cell cycle. Any suggestions about reason or mechanism of decreasing cells proliferation?

Thank you! This was very useful!

in our lab, the 231 is AR-negative, yet it responds to DHT at the molecular level. strange!!

Strange, yes. I know that...What does it mean?

it is from an old book.  you can download any of Garay's reviews instead.

Which one, for example? Can you send us exact information?

There are many research articles about androgen receptors in breast cancer cells, but usually in ER+ breast cancer.

For example:

Role of the androgen receptor in breast cancer and preclinical analysis of enzalutamide, Dawn R Cochrane et al, Breast Cancer Research 2014, 16:R7

I can not find exact amount or anything similar for ER-, or triple negative breast cancer cells (MDA-MB-231).