Thursday, January 20, 2011
Breast Cancer News
Trio of Drugs May Combat 'Triple Negative' Breast Cancer
In the new study, Johns Hopkins scientists began with a drug called Entinostat, which blocks an enzyme that unfolds DNA, providing regulatory molecules access to genes within and also reactivates a gene called retinoic acid receptor-beta (RARβ). Then, they added a drug called All Trans Retinoic Acid (ATRA), related to Vitamin A, which binds a protein made by the reactivated RARβ gene. Together, the ATRA drug and RARβ gene act as a brake on cancer cell growth.
Sporadic Breast Cancers Start With Ineffective DNA Repair Systems
Ultraviolet light, for example, can cause mutations, but a sophisticated system of nucleotide excision repair (NER) proteins trolls the DNA strands to identify problems and initiate repair processes. The same system repairs damage caused by many environmental carcinogens, including tobacco smoke.
"Even in healthy breast tissue, this system is only about one-fifth as effective as it is in skin,"
Potential New Target for Treating Triple Negative Breast Cancer Identified
Now researchers in Dublin (Ireland) have found that TNBC cells respond to compounds that disrupt the signalling processes of another receptor, EGFR (epidermal growth factor receptor), high levels of which are expressed in TNBC
Posted by John at 1:06 AM