Breast cancer misdiagnosis claims

If your breast cancer was missed or diagnosed late, our breast cancer misdiagnosis solicitors can help. A reassuring examination is not the same as a clear scan, and a dismissed lump or a misread mammogram can change the treatment you need.

Our medical negligence team can tell you whether a delay amounts to a claim, and we act on a no win no fee basis. Our work on delayed cancer diagnosis claims is recognised by Legal 500 2026 and Chambers UK 2026.

Why a clinical examination on its own is not enough

A breast lump should be checked with three tests, known as triple assessment. The first is an examination by a breast specialist. The second is imaging, usually an ultrasound scan for younger women and a mammogram for older women. The third is a biopsy of anything that looks suspicious, using a core needle or a fine needle. This is the standard you should expect at a one-stop breast clinic.

Many of the claims we run begin with an examination that ruled the lump out without imaging or a biopsy, sometimes because it felt harmless. That may fall short of the expected standard, particularly if you were not referred, or were discharged from a breast clinic without imaging. Under NICE guideline NG12, a GP should make an urgent suspected cancer referral for anyone aged 30 or over with an unexplained breast lump, and should consider a non-urgent referral for anyone younger.

What a breast cancer misdiagnosis claim needs to establish

A claim does not exist simply because something went wrong. We need to prove two things side by side.

The first is breach of duty. We have to show the care you received fell below what a reasonably competent GP, breast surgeon or radiologist would have provided. A breast lump that was not referred urgently under the suspected cancer pathway. A young woman whose lump was labelled a fibroadenoma without an ultrasound. Nipple discharge or other changes in one nipple in a woman aged 50 or over, or skin dimpling, that were monitored rather than investigated. A screening mammogram that was misread. A strong family history that was never sent to the family history clinic for BRCA assessment. Each of these is a recognised breach pattern.

The second is causation. Even where the standard of care was poor, you only have a claim if earlier diagnosis would have changed your prognosis or your treatment. We instruct independent breast surgeons and oncologists to compare what your surgery, chemotherapy and prognosis would have been at the missed appointment with what they are now. For example, a delay can let a small tumour grow or spread to the lymph nodes, so that you need a mastectomy, lymph node surgery or chemotherapy you might otherwise have avoided.

How screening failures and family history get missed

The NHS Breast Screening Programme invites women aged 50 up to their 71st birthday for a mammogram every three years, and screening failures form a recognisable group of the claims we handle. Films misread by the first or second reader. Recall letters that were never sent after a suspicious finding. Microcalcifications that should have triggered a biopsy and did not. Our guide to breast cancer screening, mammograms and negligence explains how screening works and where it can go wrong.

Most women under 50 are not offered routine screening, so they depend on their GP referring them when they report symptoms. That makes the dismissal of a lump in a younger woman especially serious, because there is no programme behind the GP to catch the error.

Family history cases are a separate failure pattern. A strong family history, such as several close relatives with breast or ovarian cancer, especially at a young age, should prompt a referral to a family history clinic for genetic assessment and a surveillance plan. We act for women whose documented family history was not acted on.

How a delayed diagnosis changes your treatment and your body

Stage at diagnosis decides what treatment can do. The earlier the cancer, the smaller the operation and the less aggressive the follow-up. A small cancer that has not spread can often be treated with breast-conserving surgery and radiotherapy. A cancer found later may need a mastectomy, surgery to the lymph nodes and chemotherapy. 

The compensation we recover reflects that escalation. A later diagnosis can result in more extensive surgery and long-term consequences that earlier treatment may have avoided. For some women the delay turns a survivable cancer into a fatal one. We act for families in fatal medical negligence claims where a family member would still be alive if her symptoms had been investigated when she first raised them.

Unnecessary or inappropriate breast surgery

Not every breast claim is about a missed cancer. Some women have surgery they did not need, or more extensive surgery than their condition called for, such as a mastectomy where breast-conserving surgery would have been appropriate.

Our article on the Darlington breast surgery review covers one recent example, where a hospital trust found that women had mastectomies they did not need.

If you were treated at that trust or anywhere else, and you are worried that your surgery was unnecessary or went further than it should have, we can review your records and advise whether you have a claim.

What breast cancer compensation typically covers

Where negligence contributed to a late breast cancer diagnosis, compensation typically reflects both the physical impact and the financial consequences that follow. In practice, that includes:

• Loss of earnings where treatment has stopped you working or shortened your working life.
• The cost of private treatment and reconstruction surgery that the NHS pathway does not fund or that you cannot wait for.
• Care, equipment and help at home during chemotherapy and recovery from surgery.
• Fertility preservation costs, including egg or embryo freezing, where chemotherapy has put your fertility at risk.
• Future losses, including pension shortfall and the earnings you will lose if your life expectancy has been shortened.

Our cancer misdiagnosis solicitors have recovered six-figure settlements in delayed cancer diagnosis claims. The figure in any individual case depends on the stage of cancer at the missed appointment, the stage at diagnosis, the treatment escalation it caused, and the impact on your life.

Why women with breast cancer claims come to Osbornes

Our medical negligence team is led by partner Jodi Newton, whose work on delayed cancer diagnosis claims is recognised by Chambers UK 2026 and Legal 500 2026. Several of our solicitors hold medical qualifications, which means we read GP notes, breast clinic letters, radiology reports and oncology dictation the way an expert witness would.

We are members of the Action against Medical Accidents (AvMA) clinical negligence panel and hold the Law Society Clinical Negligence Accreditation.

★★★★★

“We cannot thank Osbornes Solicitors enough for their outstanding support in helping my brother with a complex negligence claim. From start to finish, the service we received was exceptional. Our solicitor, Elline, was truly brilliant, professional, knowledgeable, compassionate and incredibly thorough at every step.”

Speak to a breast cancer misdiagnosis lawyer today

If you believe your breast cancer was missed, misdiagnosed or diagnosed too late, our cancer misdiagnosis lawyers will review your case in confidence and without obligation.

You usually have three years to bring a claim. The three years run from the date of the harm, or from the date you knew, or could reasonably have found out, that your injury was significant and may have been caused by something your doctors did or failed to do, if that is later. Different rules apply to children, to people who lack mental capacity and where someone has died, and the court can sometimes allow a late claim, so contact us even if you think you are out of time. The later date often applies in breast cancer cases because the link between a dismissed lump or a missed mammogram and the eventual diagnosis only becomes clear later. We can advise on which date applies to your situation.

Call 020 7485 8811 or fill in the contact form below.