A trial looking at coumate for advanced breast cancer (PH1/096)

Cancer type:

Breast cancer




Phase 1

This trial looked at a new drug called coumate to treat hormone receptor positive breast cancer in women who have been through the menopause. This trial was supported by Cancer Research UK.

Coumate (or 667-coumate) is a type of drug called a sulphatase inhibitor. This means it stops an enzyme called sulphatase working properly. Sulphatase is important in the production of oestrogen in post menopausal women.

The theory is that if doctors can reduce the amount of oestrogen in the body, they can stop oestrogen receptor (ER) or progesterone receptor (PR) positive breast cancers growing.

In this trial, the researchers took samples of blood and cancer tissue (a biopsy) from each patient after they had had treatment.

The aims of this trial were to find out

  • What effect coumate had on the levels of sulphatase and oestrogen in the body
  • The best dose of coumate to use
  • What the side effects are

Summary of results

The research team found that coumate was safe, and that it may be a useful treatment for post menopausal women with ER or PR positive breast cancer in the future.

This was a very small trial. It recruited 14 patients who had already had treatment for breast cancer. 5 had a lower dose of coumate, and 9 had a higher dose.

Only 8 patients had all 16 doses of coumate as planned. The other 6 stopped treatment part way through because their cancer had continued to grow.

Of the 14 who took part, the research team were able to analyse the blood and tissue samples of 10. They looked at the results in early 2005.

They found that

  • The level of sulphatase in the blood and tissue samples was almost 0 in most patients
  • The levels of hormones were significantly reduced
  • The cancer stopped growing in 4 patients (researchers call this ‘stable disease Open a glossary item’)

The side effects were generally mild. The most common side effect was a change in taste, but for most people this only lasted a few hours or so.

The research team concluded that coumate was safe and could be a useful treatment in this group of patients.

We have based this summary on information from the team who ran the trial. The information they sent us has been reviewed by independent specialists (peer reviewed Open a glossary item) and published in a medical journal. The figures we quote above were provided by the trial team. We have not analysed the data ourselves.

Recruitment start:

Recruitment end:

How to join a clinical trial

Please note: In order to join a trial you will need to discuss it with your doctor, unless otherwise specified.

Please note - unless we state otherwise in the summary, you need to talk to your doctor about joining a trial.

Chief Investigator

Professor R Coombes

Supported by

Cancer Research UK (Centre for Drug Development)

Other information

This is Cancer Research UK trial number CRUKD/03/038.

Questions about cancer? Contact our information nurses

Freephone 0808 800 4040

Last review date

CRUK internal database number:

Oracle - 333

Please note - unless we state otherwise in the summary, you need to talk to your doctor about joining a trial.

Harriet wanted to try new treatments

Picture of Harriet

“I was keen to go on a clinical trial. I wanted to try new cancer treatments and hopefully help future generations.”

Last reviewed:

Rate this page:

No votes yet
Thank you!
We've recently made some changes to the site, tell us what you think

Share this page