A trial looking at capecitabine with or without bevacizumab for colorectal cancer (QUASAR 2)

Please note - this trial is no longer recruiting patients. We hope to add results when they are available.

Cancer type:

Bowel (colorectal) cancer
Colon cancer
Rectal cancer




Phase 3

This trial is comparing capecitabine and bevacizumab with capecitabine alone for bowel (colorectal) cancer.

Surgery is a common treatment for bowel cancer. And doctors often treat colorectal cancer with chemotherapy after surgery to help stop the cancer coming back. Two drugs commonly used are 5FU and capecitabine (Xeloda). Capecitabine is similar to 5FU but is a tablet rather than an injection.

Doctors think that the combination of capecitabine and bevacizumab (Avastin) may be even better at stopping the cancer coming back. But they are not sure yet how well this new combination will work. Bevacizumab is type of biological therapy called a monoclonal antibody.

In this trial, some patients have capecitabine alone. And some have capecitabine and bevacizumab. The aim of the trial is to find out which is best at stopping colorectal cancer coming back after surgery. And to find out more about the side effects.

Who can enter

You can enter this trial if you

  • Have stage 3 colorectal cancer or stage 2 colorectal cancer, which your doctors think has a high risk of spreading to another part of the body
  • Had surgery to remove all of your colorectal cancer between 4 and 10 weeks ago
  • Are well enough for treatment (performance status 0 or 1)
  • Have satisfactory blood test results
  • Are prepared to use effective contraception if there is any chance either you or your partner could become pregnant
  • Are at least 18 years old

You cannot enter this trial if you

  • Have had chemotherapy, immunotherapy or radiotherapy before
  • Have had any other trial treatment in the last 4 weeks
  • Regularly take medication to thin your blood (anti coagulants) or have blood that doesn’t clot quickly enough
  • Are taking the anti viral drugs sorivudine or brivudine
  • Have chronic inflammatory bowel disease, bowel obstruction, a stomach ulcer or any other condition that means you are not able to take or absorb tablets
  • Have heart disease, or have had a stroke or heart attack in the last year
  • Have had any other cancer, apart from non melanoma skin cancer or carcinoma in situ of the cervix
  • Are pregnant or breastfeeding

Trial design

This is a phase 3 trial. It will recruit 2,240 patients into 2 groups. The trial is randomised. The people taking part are put into treatment groups by a computer. Neither you nor your doctor will be able to decide which group you are in.

If you are in group 1, you will have capecitabine. You take capecitabine tablets twice a day (12 hours apart) for 2 weeks out of every 3. Then you don’t take any in the 3rd week. Each 3 week block is one cycle of chemotherapy. You have 8 cycles over about 6 months altogether.

If you are in group 2, you will have capecitabine and bevacizumab. You take capecitabine tablets as for group 1 above. On the first day of each 3 week cycle you have bevacizumab through a drip into a vein. This takes about an hour and a half for first dose, about an hour for the second dose, and about half an hour for each dose after that.

You have 8 cycles of capecitabine over about 6 months. But you have 16 cycles of bevacizumab, so treatment will take about 12 months altogether.

Hospital visits

You will see the doctors and have some blood tests and a urine test before you start the trial.

If you are in group 1 you will go to hospital once every 3 weeks to see the doctors and pick up your capecitabine tablets.

If you are in group 2 you go to the hospital once every 3 weeks to pick up your capecitabine tablets and to have the bevacizumab injection. You will have blood tests and urine test before each dose of bevacizumab.

After you finish treatment you will see the doctors every 6 months for a year and then once a year after that.

Side effects

The most common side effects of capecitabine are

The most common side effects of bevacizumab are

There is more information about capecitabine (Xeloda) and bevacizumab (Avastin) on CancerHelp UK.

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

Dr David Kerr

Supported by

Cancer Research UK
Experimental Cancer Medicine Centre (ECMC)
NIHR Clinical Research Network: Cancer
University of Oxford

Other information

This is Cancer Research UK trial number CRUKE/02/017.

Questions about cancer? Contact our information nurses

Freephone 0808 800 4040

Last review date

CRUK internal database number:

Oracel 403

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

Around 1 in 5 people take part in clinical trials

3 phases of trials

Around 1 in 5 people diagnosed with cancer in the UK take part in a clinical trial.

Last reviewed:

Rate this page:

Currently rated: 1 out of 5 based on 1 vote
Thank you!
We've recently made some changes to the site, tell us what you think

Share this page