Ask For a Blood test to identify AR-V7 in Circulating Tumor Cells if you are starting Xtandi or Zytiga

One of the hot topics in the prostate cancer community is the value of detecting AR-V7 tumor cells circulating in the blood. AR-V7 tumor cells in the blood predicts response or failure of treatment with enzalutamide (Xtandi) or abiraterone (Zytiga). A recent study found that men who have AR-V7 circulating tumor cells in their blood will not respond to Xtandi or Zytiga and will live longer if treated with a taxane based chemotherapy (docetaxel) regimen. A study in JAMA Oncology, showed that evaluating for the presence of circulating tumor cells (CTCs) with AR-V7 could optimize treatment protocols. The study looked at 161 men with progressing metastatic castration-resistant [...]

Xtandi In Combination with Zytiga Is Not Better Than Either Drug Alone

Often I have heard people ask why if one drug is effective we shouldn’t simply take two or three at the same time? The answer is simple, because we don’t know if combining multiple drugs will make any difference to a man’s survival. The only way we can be sure is with good evidence. Good evidence requires, in the case of drugs, doing a clinical trial to see if a certain type of combination will be beneficial. In such a late-stage clinical trial designed to see if Xtandi in addition to Zytiga along with a steroid worked any better than [...]

Is Alkaline Phosphatase A Bio-Marker To Predict PSA Decline And Clinical Benefit From Abiraterone Acetate in Bone Metastatic Castration Resistant Prostate Cancer

Again and again I have mentioned the huge need we have for the development of reliable bio-markers. Reliable bio-markers will allow us to know which men will respond positively to a treatment (also those who will not) and when a treatment is still effective (also when it no longer is effective). These biomarkers really don’t exist, so a lot of clinical decision-making is based upon the experience and gut feeling of our doctors. This type of decision-making is not adequate in today’s world of multiple treatment options, especially when many of the treatments can foster resistance to other available treatments. [...]

Some Factors That Might Be Predictors of the Duration of Abiraterone Acetate in Men with Castration-Resistant Prostate Cancer

Being able to make better decisions about drug sequencing and combinations has become one of the current hot topics in prostate cancer research. Given that we have a number of newer drugs to use this is an important clinical issue as we make important treatment decisions. Making these clinical decisions is tough.  The fact is that prostate cancer is a very heterogeneous disease and so  drug  responses are not consistent. Compounded by the fact that none of our treatments are effective for an extended time period knowing how to accurately predict drug response is vital. One  example of research dealing [...]

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