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Thousands of women offered anastrozole to help prevent breast cancer

Tim Gunn
by Tim Gunn | News

7 November 2023

7 comments 7 comments

Two Cancer Research UK-funded researchers in their lab.
©Jane Stockdale for Cancer Research UK


The breast cancer treatment anastrozole has today been licensed as an option for preventing the disease in high-risk women in the UK. 

An estimated 289,000 post-menopausal women, most with a significant family history of breast cancer, could now be eligible to use anastrozole as a preventive treatment. A trial we funded showed that it can halve their risk.

Overall, research suggests that just one in four eligible women taking anastrozole should prevent around 2,000 cases of breast cancer. 

“Approaches to help prevent breast cancer in women at high risk are badly needed, so this is a welcome announcement,” said Dr David Crosby, head of prevention and early detection at Cancer Research UK. 

“We carried out some of the key work on developing these kinds of drugs, known as ‘aromatase inhibitors’, and ten years ago our clinical trial showed that anastrozole could halve the risk of some women developing breast cancer, with minimal side effects.” 

Previously, anastrozole was only licensed by the the Medicines and Healthcare products Regulatory Agency (MHRA) for use as a breast cancer treatment, which meant it was difficult to get it to women who could benefit from it as a risk-reducing option. It’s the first medicine the MHRA has relicensed as part of NHS England’s Medicines Repurposing Programme. 

One of the high-risk women who was offered anastrozole ‘off-label’ as a preventive drug is Lesley-Ann Woodhams. The 61-year-old completed the full five-year course of one tablet a day in January 2023. 

She said: “Taking anastrozole was an easy decision for me, as I’d watched my mum battle breast cancer and my risk was very high.  

“It really was a gift, it gave my family and myself peace of mind and more importantly, a continued future to look forward to. I’m grateful for every day I took this drug – it was life-changing. Anastrozole has allowed me to continue living my life as I’d planned.”

Because anastrozole is an older drug, it’s now off-patent, which means more than one company can produce it and it’s available more cheaply. The entire five-year course of treatment now costs just £78, or around 4p a day. Preventing 2,000 cases of breast cancer should also save £15m in treatment costs, according to NHS England. 

“Repurposing therapeutic drugs that have already been shown to be safe for prevention is an area with a lot of potential,” said Crosby. “More research will be key to finding more opportunities like this, to better understand who is at a high risk of getting cancer, and to help lower that risk.”  

He added: “If you have a family history of breast cancer and are worried about your cancer risk, speak to your doctor.” 

    Comments

  • jane powell
    12 March 2024

    Can you identify the trials undertaken and results and evidence that identified that it halves reoccurrence in breast cancer.

  • reply
    Jacob Smith
    13 March 2024

    Hi Jane,

    The MHRA’s decision to license anastrozole as a preventative treatment was based on the results of the IBIS-II trial.

    In the trial, 3864 postmenopausal women at increased risk of developing breast cancer were recruited and assigned to receive anastrozole or a placebo every day for 5 years. When they’d finished their treatment, the team checked in on them every year to to collect data on breast cancer incidence.

    They found a 49% reduction in breast cancer among those who received treatment with anastrozole vs the group that received a placebo (85 vs 165 cases) after a median follow-up of 131 months. Cases of invasive oestrogen receptor-positive breast cancer specifically were reduced by 54%, and ductal carcinoma in situ by 59%, especially in participants known to be oestrogen receptor-positive.

    These results showed that 5-year treatment with anastrozole has continued long-term effect in preventing breast cancer in these high-risk groups.

    I hope that helps,
    Jacob, Cancer Research UK

  • Sarah
    17 February 2024

    Can it only be taken post-menopause? I am 52 with strong family history of breast cancer. I’d like to do preventative treatment.

  • reply
    Jacob Smith
    19 February 2024

    Hi Sarah,

    Thanks for your comment.

    The best thing to do to find out if you’re eligible for any treatment is to speak to your doctor.

    Or, if you have general questions about cancer treatment, you can reach out to Cancer Research UK’s nurses. You can call on freephone 0808 800 4040 between 9am and 5pm Monday to Friday. However, please note that our nurses can’t give a medical opinion or speak to a healthcare professional on your behalf.

    Alternatively, if you’d like to chat online with other people affected by cancer, you can join our fully moderated online community Cancer Chat at http://www.cancerchat.org.uk.

    I hope that helps,
    Jacob, Cancer Research UK

  • Mrs. Philippa Stanley
    6 January 2024

    I am 61 with a family history of breast cancer ( sister 2017 diagnosis and mother died 1988 ) I was offered Anastrozole in 2017 and declined. Now I wonder whether I should take this drug.
    I am fit and healthy and only medication I take 10 mg statin. I can’t decide what I should do. Any advice would be appreciated
    Any advise ?

  • reply
    Jacob Smith
    8 January 2024

    Hi Philippa,

    Thanks for your comment.

    The best place to go if you have questions is to reach out to Cancer Research UK’s nurses. You can call on freephone 0808 800 4040 between 9am and 5pm Monday to Friday. However, please note that our nurses cannot give a medical opinion or speak to a healthcare professional on your behalf.

    Alternatively, if you’d like to chat online with other people affected by cancer, you can join our fully moderated online community Cancer Chat at http://www.cancerchat.org.uk.

    I hope that helps,
    Jacob, Cancer Research UK

  • Pat Ashby
    6 December 2023

    I had a right sided lumpectomy. Didn’t suspect anything was wrong until I had mastectomy. I was given a lumpectomy as it seems there is a push for breast conserving surgery. Mastectomy was not given as an option at any time. I have had a terrible time on the drugs, and Tamoxifen gave me a blood clot. Other meds have made my joints ache to the point I am bent over. As I already have osteoarthritis this has made things so much worse. If I had been fully clued up I would have chosen a mastectomy without follow up drugs. To me this would have been so much better than being on drugs for years . Julia Bradbury TV presenter also chose this route. Even now I would rather they took me in and did a mastectomy rather than have yet more years on these horrible drugs. I feel this is a right of every woman.

  • Lesley Christine Asque
    29 November 2023

    I had Breast Cancer (Right) in 2004 (Er+ive) had a lumpectomy and Radio Therapy and I agreed to do a Clinical Trial Tamoxifen vs Aromatase Inhibitor Letrozole. I chose to stay with AI. I was on them for 15+ years feeding back information to Novartis. I came off them in 2019 as the benefits were outweighed by the side-effects. In 2021 I had a new cancer in the same Breast (Triple Negative) which at the moment can’t be treated. I had a Mastectomy and see my Surgeon annually after a mammogram on the other Breast. Not sure that taking AI again would help in this case even in the other Breast?. But I am very pleased it is being offered to woman to prevent the onset of cancer, it certainly kept me free for 15 years!

  • Mrs Beverly C Smith
    12 November 2023

    I had left sided breast cancer in 2000 treated with a lumpectomy and 30 zaps of radiotherapy. I am adopted so have no family history. I was on tamoxifen for 10 years, then it was discontinued. In 2020 cancer returned in the other breast with metastases in liver and spine. Surely as I had had breast cancer once I should have been offered the above treatment, but I was not. Please consider that if you have had it once you should be carefully monitored. I will not benefit now, but perhaps someone else in the future will be.

  • Susan Watton
    11 November 2023

    I have a friend who is at high risk of getting breast cancer and as soon as the drug Anastrozole was announced in the news as being available contacted her clinicians about being prescribed this drug. So far she has been declined. One of the reasons being cost when I believe the tablets are only 4p each and one per day. Surely a lot cheaper for prevention rather than cure down the line?

Tell us what you think

Leave a Reply

Your email address will not be published. Required fields are marked *

Read our comment policy.

    Comments

  • jane powell
    12 March 2024

    Can you identify the trials undertaken and results and evidence that identified that it halves reoccurrence in breast cancer.

  • reply
    Jacob Smith
    13 March 2024

    Hi Jane,

    The MHRA’s decision to license anastrozole as a preventative treatment was based on the results of the IBIS-II trial.

    In the trial, 3864 postmenopausal women at increased risk of developing breast cancer were recruited and assigned to receive anastrozole or a placebo every day for 5 years. When they’d finished their treatment, the team checked in on them every year to to collect data on breast cancer incidence.

    They found a 49% reduction in breast cancer among those who received treatment with anastrozole vs the group that received a placebo (85 vs 165 cases) after a median follow-up of 131 months. Cases of invasive oestrogen receptor-positive breast cancer specifically were reduced by 54%, and ductal carcinoma in situ by 59%, especially in participants known to be oestrogen receptor-positive.

    These results showed that 5-year treatment with anastrozole has continued long-term effect in preventing breast cancer in these high-risk groups.

    I hope that helps,
    Jacob, Cancer Research UK

  • Sarah
    17 February 2024

    Can it only be taken post-menopause? I am 52 with strong family history of breast cancer. I’d like to do preventative treatment.

  • reply
    Jacob Smith
    19 February 2024

    Hi Sarah,

    Thanks for your comment.

    The best thing to do to find out if you’re eligible for any treatment is to speak to your doctor.

    Or, if you have general questions about cancer treatment, you can reach out to Cancer Research UK’s nurses. You can call on freephone 0808 800 4040 between 9am and 5pm Monday to Friday. However, please note that our nurses can’t give a medical opinion or speak to a healthcare professional on your behalf.

    Alternatively, if you’d like to chat online with other people affected by cancer, you can join our fully moderated online community Cancer Chat at http://www.cancerchat.org.uk.

    I hope that helps,
    Jacob, Cancer Research UK

  • Mrs. Philippa Stanley
    6 January 2024

    I am 61 with a family history of breast cancer ( sister 2017 diagnosis and mother died 1988 ) I was offered Anastrozole in 2017 and declined. Now I wonder whether I should take this drug.
    I am fit and healthy and only medication I take 10 mg statin. I can’t decide what I should do. Any advice would be appreciated
    Any advise ?

  • reply
    Jacob Smith
    8 January 2024

    Hi Philippa,

    Thanks for your comment.

    The best place to go if you have questions is to reach out to Cancer Research UK’s nurses. You can call on freephone 0808 800 4040 between 9am and 5pm Monday to Friday. However, please note that our nurses cannot give a medical opinion or speak to a healthcare professional on your behalf.

    Alternatively, if you’d like to chat online with other people affected by cancer, you can join our fully moderated online community Cancer Chat at http://www.cancerchat.org.uk.

    I hope that helps,
    Jacob, Cancer Research UK

  • Pat Ashby
    6 December 2023

    I had a right sided lumpectomy. Didn’t suspect anything was wrong until I had mastectomy. I was given a lumpectomy as it seems there is a push for breast conserving surgery. Mastectomy was not given as an option at any time. I have had a terrible time on the drugs, and Tamoxifen gave me a blood clot. Other meds have made my joints ache to the point I am bent over. As I already have osteoarthritis this has made things so much worse. If I had been fully clued up I would have chosen a mastectomy without follow up drugs. To me this would have been so much better than being on drugs for years . Julia Bradbury TV presenter also chose this route. Even now I would rather they took me in and did a mastectomy rather than have yet more years on these horrible drugs. I feel this is a right of every woman.

  • Lesley Christine Asque
    29 November 2023

    I had Breast Cancer (Right) in 2004 (Er+ive) had a lumpectomy and Radio Therapy and I agreed to do a Clinical Trial Tamoxifen vs Aromatase Inhibitor Letrozole. I chose to stay with AI. I was on them for 15+ years feeding back information to Novartis. I came off them in 2019 as the benefits were outweighed by the side-effects. In 2021 I had a new cancer in the same Breast (Triple Negative) which at the moment can’t be treated. I had a Mastectomy and see my Surgeon annually after a mammogram on the other Breast. Not sure that taking AI again would help in this case even in the other Breast?. But I am very pleased it is being offered to woman to prevent the onset of cancer, it certainly kept me free for 15 years!

  • Mrs Beverly C Smith
    12 November 2023

    I had left sided breast cancer in 2000 treated with a lumpectomy and 30 zaps of radiotherapy. I am adopted so have no family history. I was on tamoxifen for 10 years, then it was discontinued. In 2020 cancer returned in the other breast with metastases in liver and spine. Surely as I had had breast cancer once I should have been offered the above treatment, but I was not. Please consider that if you have had it once you should be carefully monitored. I will not benefit now, but perhaps someone else in the future will be.

  • Susan Watton
    11 November 2023

    I have a friend who is at high risk of getting breast cancer and as soon as the drug Anastrozole was announced in the news as being available contacted her clinicians about being prescribed this drug. So far she has been declined. One of the reasons being cost when I believe the tablets are only 4p each and one per day. Surely a lot cheaper for prevention rather than cure down the line?

Tell us what you think

Leave a Reply

Your email address will not be published. Required fields are marked *

Read our comment policy.