ASCO 2017 - Major results in metastatic prostate cancer treatment

Villejuif, 3 June 2017

ASCO 2017 / Plenary Session

A 38% reduction in the risk of death in treatment of patients with metastatic prostate cancer      

The findings of a large clinical study are going to change the preferred methods of treatment of metastatic prostate cancer which have remained almost unchanged for 70 years.     

On Sunday June 4th, Professor Karim Fizazi, Head of the Department of Cancer Medicine at Gustave Roussy, will be presenting the LATITUDE study in a plenary lecture at the American Society of Clinical Oncology (ASCO) Congress in Chicago. The favorable results from this trial will likely change how these patients are being treated. The data will be published in the New England Journal of Medicine on Sunday June 4th either.      

“Although prostate cancer is very responsive to conventional  hormonal therapy, it does not completely eradicate all malignant  cells and residual hormone production persists. The LATITUDE trial demonstrates that abiraterone, administered upfront in combination with standard hormonal therapy reduces the risk of death by 38% and the risk of progression of cancer or death by more than 50% at 2½ years of follow-up. These important  findings will very likely change the standard of care of patients who have evidence of metastatic disease at the time of prostate  cancer diagnosis ” explained Professor Fizazi.      

LATITUDE is a major phase III international multicentre comparative clinical study (double blind, placebo-controlled) involving 235 sites in 34 countries. 1,200 patients were enrolled between February 2013 and December 2014. The objective was to assess the beneficial effects of abiraterone on overall  survival and survival without cancer progression in patients newly diagnosed  with metastatic prostate cancer. It is sponsored by Janssen Biotech and  Professor Fizazi is the principal investigator.      

Until 2015, patients with metastatic prostate cancer were treated with  standard hormonal therapy aiming to inhibit the testicular production of testosterone. In the LATITUDE study, patients were randomised to  receive either abiraterone acetate, a next-generation hormonal therapy  which inhibits the synthesis of androgens from the adrenal glands and the cancer cells themselves, or a placebo, in addition to standard treatment  (conventional hormonal therapy). Prednisone was associated to abiraterone  to prevent the risk of hypertension and hypokalaemia.      

The results show that the addition of abiraterone to conventional hormonal  therapy not only considerably improves the outcome of these patients  (overall survival and progression-free survival) but also all of the diseaserelated  complications, such as bone pain, fractures, and spinal cord  compression secondary to tumor spread to the vertebrae.      

Abiraterone has had Marketing Authorisation since 2012. It is currently used as salvage therapy in patients with metastatic prostate cancer which  have become refractory to conventional hormonal therapy (“castrationresistant  prostate cancer”).    

“One other advantage of this drug is that it is taken orally and  is usually very well-tolerated. These major results represent very  good news for our patients and we believe that the beneficial  effects may even be greater with longer follow-up,” says Professor  Fizazi. Data from an English phase III clinical trial of the same agent are  also awaited.    

The next step is the European PEACE-1 study sponsored by UNICANCER and  directed by Professor Fizazi. This is evaluating the addition of abiraterone  to “reinforced background” treatment consisting of standard hormonal  therapy and chemotherapy. The first results are expected in 2020.  

Prostate cancer is the commonest cancer in France, with more than 55,000 new cases diagnosed each year. At the time of diagnosis, some 10 to 15%  of patients have metastases, which in most cases are located in the bones  and the lymph nodes. It is responsible for 8,000 to 9,000 deaths per year in  France.

LATITUDE: A phase III, double-blind, randomized trial of androgen deprivation therapy with abiraterone acetate plus prednisone or placebos in newly diagnosed high-risk metastatic hormone-naive prostate cancer.
Oral presentation by Karim Fizazi
Plenary Session
Sunday 4 June at 14h40 (local time)
Place: Hall B1
Abstract No: LBA3 available on http://abstracts.asco.org

► LATITUDE study: major results in metastatic prostate cancer: See the video on Youtube

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