We previously generated stable MDA-MB-231 breast cancer cells with doxycycline (dox)-inducible expression of thoroughly characterized camelid nanobodies targeting CTTN SH3 or NTA domain (CTTN SH3 Nb2 or CTTN NTA Nb212,26, respectively) or FSCN1 (FSCN1 Nb512,29). The gene discussed is CTTN; the disease is breast cancer.