it appears the effects of bisphosphonates may not be same 4 all brst cancer subtypes

[Lani]

SKBr3 is a cell line which is her2+ER-. It does not appear that they tested BT-474 which is her2+ER+. The bisphosphonate they tested is a new experimental one. Will try to research this further.

PLoS ONE. 2009;4(3):e4685. Epub 2009 Mar 5.

New Symmetrically Esterified m-Bromobenzyl Non-Aminobisphosphonates Inhibited Breast Cancer Growth and Metastases.

Abdelkarim M, Guenin E, Sainte-Catherine O, Vintonenko N, Peyri N, Perret GY, Crepin M, Khatib AM, Lecouvey M, Di Benedetto M.
Université Paris 13, CNRS FRE CSPBAT, Laboratoire de Chimie Structurale Biomoléculaire, Laboratoire de pharmacologie, Université Paris 13, UFR SMBH, Bobigny, France.
BACKGROUND: Although there was growing evidence in the potential use of Bisphosphonates (BPs) in cancer therapy, their strong osseous affinities that contrast their poor soft tissue uptake limited their use. Here, we developed a new strategy to overcome BPs hydrophilicity by masking the phosphonic acid through organic protecting groups and introducing hydrophobic functions in the side chain. METHODOLOGY/PRINCIPAL FINDINGS: We synthesized non-nitrogen BPs (non N-BPs) containing bromobenzyl group (BP7033Br) in their side chain that were symmetrically esterified with hydrophobic 4-methoxphenyl (BP7033BrALK) and assessed their effects on breast cancer estrogen-responsive cells (T47D, MCF-7) as well as on non responsive ones (SKBR3, MDA-MB-231 and its highly metastatic derived D3H2LN subclone). BP7033Br ALK was more efficient in inhibiting tumor cell proliferation, migration and survival when compared to BP7033Br. Although both compounds inhibited tumor growth without side effects, only BP7033Br ALK abrogated tumor angiogenesis and D3H2LN cells-induced metastases formation. CONCLUSION/SIGNIFICANCE: Taken together these data suggest the potential therapeutic use of this new class of esterified Bisphosphonates (BPs) in the treatment of tumor progression and metastasis without toxic adverse effects.
PMID: 19262688