Delayed Breast Cancer Diagnosis

The groups do not always agree. They differ most on how often to screen and when to start or stop. A doctor who followed any major guideline is usually not negligent on the schedule alone.

Guidelines help show what careful care looks like, but they are not the law. In a case, the standard of care, meaning what a careful doctor in that field would have done, is proven by expert testimony.

Insurance coverage rules are not the standard of care either. But they can help explain why a test was or was not ordered.

Where do delays in diagnosing breast cancer happen?

Delays tend to happen at five stages of care. Each stage below lists common missed steps and links to an article with more detail.

Screening

• Screening never came up. Years of yearly physicals passed with no talk about mammograms and no order. See: My doctor never told me to get a mammogram.
• Dense breasts were noted, but risk was not considered. The report said the breasts were dense, and no one looked at the whole picture of the patient’s risk. See: Dense breasts.
• A young patient’s risk was overlooked. A family history or a gene change was never asked about or acted on. See: I was told I was too young for breast cancer.

Evaluating a symptom

• A lump was called nothing after a hands-on exam alone. No imaging was ordered, or the patient was told to wait with no return date. See: My doctor said the lump was nothing.
• A normal mammogram ended the workup. A screening mammogram was treated as the answer for a lump that was still there. See: I had a normal mammogram, but I could feel a lump.
• Other warning signs were treated as something else. A red breast got round after round of antibiotics, a nipple rash got creams, or thickening was called normal lumpiness. An armpit lump may have been called a swollen gland or extra breast tissue, or a lump blamed on an implant. See the articles on breast infections, nipple changes, armpit lymph nodes, lobular cancer, breast implants, and extra breast tissue.

Reading the images

• A finding was missed or rated too low. A change on the mammogram was not reported, or was given a lower rating than it deserved.
• Earlier images were not compared. Comparing new images to old ones shows change over time. When that step is skipped, a slow change in breast tissue can be missed.

Biopsy and pathology

• A benign result did not fit the images. A suspicious spot came back benign, and no one ordered another biopsy or surgery. See: My biopsy was benign, but it turned out to be cancer.
• The slides were misread, or specimens were mixed up. A pathologist missed cancer on the slides, or one patient’s tissue was labeled as another’s. These errors are less common, but they do happen.

Follow-up and communication

• A recheck was never scheduled. The report said to come back in six months, and no order or reminder followed. See: The report said come back in six months, and no one followed up.
• A result never reached the patient. A report went to the wrong doctor, or an incomplete result was described as normal.

Why does causation come first in a delayed diagnosis case?

Because a missed step alone is not enough for a claim. The delay must have caused real harm, usually a meaningful loss of survival or the loss of a chance for a cure.

That is why we start our review with causation, not with the mistake. If an earlier diagnosis likely would not have changed the outcome, a case is usually not worth bringing, even when a doctor’s medical treatment fell below accepted standards.

Which harms do these cases focus on?

Our firm focuses on delays that led to death or catastrophic injury. In breast cancer cases, these are the harms that usually matter:

1. Cancer that spread to distant organs, such as the bones, liver, lungs, or brain, before it was found. It can still be treated, but it can no longer be cured.
2. Death from a breast cancer that, if found earlier, would likely have been curable.

What makes a delay in diagnosing breast cancer matter?

Breast cancers grow and spread at very different speeds, largely driven by two key features: grade and molecular subtype.

• Tumor Grade: Grade reflects how abnormal and disorganized cancer cells appear under a microscope compared to healthy tissue. Grade 1 (low-grade) tumors contain cells that look more like normal breast tissue and tend to divide slowly, whereas Grade 3 (high-grade) tumors are composed of poorly differentiated, rapidly dividing cells that carry a higher risk of early growth and spread.
• Molecular Subtype: Subtype identifies the specific biological fuel driving the tumor. Pathologists test tissue for estrogen receptors (ER), progesterone receptors (PR), excess HER2 proteins, and the Ki-67 proliferation index (a marker of how fast cells are dividing).
  • Cancers that rely on estrogen or progesterone (hormone receptor-positive) typically grow more gradually and are targeted with hormone-blocking therapies.
  • Cancers with amplified HER2 protein or “triple-negative” cancers (which lack ER, PR, and HER2) reproduce much faster and carry higher risks of aggressive growth, requiring urgent systemic treatments such as targeted biologic drugs or chemotherapy.

In a delayed diagnosis case, this biology is central to proving causation. A delay of several months may have little effect on an indolent, low-grade, hormone-positive tumor, but that same window of time can allow a fast-doubling, high-grade or triple-negative cancer to advance into nearby lymph nodes or metastasize to distant organs.

Medical malpractice lawyers and the medical experts necessary to support a lawsuit look at a few different things:

• The tumor’s size when the chance was missed, and its size at diagnosis.
• Whether the cancer had spread to the lymph nodes, the small glands under the arm, or to other organs.
• The cancer’s grade and type.
• The time between the missed chance and the diagnosis.

A delay can also change treatment. A woman who might have needed a small surgery may have needed a mastectomy, which removes the whole breast. She may have needed chemotherapy, strong cancer drugs, which might have been avoided.

How much can the breast cancer stage change the outlook?

The National Cancer Institute’s SEER program tracks five-year relative survival, which compares people with a cancer to people without it over five years. It reports these figures by how far the cancer had spread when it was found.

• Localized (only in the breast): About 99% five-year relative survival
• Regional: spread to nearby lymph nodes or tissue: : About 87% five-year relative survival
• Distant: spread to other organs: About 32% five-year relative survival

(NCI SEER Cancer Stat Facts, Female Breast Cancer, based on 2014–2020 surveillance data.)

These figures come from studies about patients diagnosed with breast cancer several years ago, and treatment keeps improving. They are averages, not predictions. Your own doctors know your outlook best. 

How do experts estimate what an earlier diagnosis of breast cancer would have found?

Experts often work backward from the diagnosis. They use the tumor’s size, grade, and type, along with earlier images, to estimate how large it likely was at the missed chance. They also estimate whether it had spread.

The defense often raises the tumor doubling argument. It uses estimates of how long a tumor takes to double in size. From those, it argues that the cancer had already spread by the time of the missed chance. Sometimes that argument is right.

But its assumptions can be questioned. Tumors do not always grow at a steady rate. Doubling times vary widely from one cancer to the next and spread to other organs does not follow size alone. Earlier images, the pathology, and the patient’s own history often matter more than a formula. Both sides’ experts weigh these points, and a jury decides.

What is Pennsylvania’s increased risk of harm rule?

In Pennsylvania, a family does not always have to prove with certainty the earlier diagnosis would have prevented the cancer from spreading to distant sites or going from treatable to terminal. It can be enough to show that the delay meaningfully increased the risk of harm. The increased risk must also have been a substantial factor in what happened. The Pennsylvania Supreme Court set out this rule in Hamil v. Bashline.

The rule does not remove the need for proof. Experts still have to explain how the delay changed the risk.

When is a delayed breast cancer diagnosis not malpractice?

Not every delay is malpractice, and a bad outcome does not prove a mistake. These are common examples where a claim is usually too weak to find expert support necessary to file a case:

• The cancer could not be seen. Some cancers do not show on a mammogram or ultrasound, even when the test is done and read correctly.
• The workup followed a recognized guideline. A doctor who did the right workup is not at fault just because the cancer was found later. Neither is a doctor who followed any major screening schedule.
• The cancer appeared between normal screenings. A cancer that grows after a normal, correctly read mammogram is often no one’s fault.
• The delay likely did not change the stage. The cancer may have already spread at the missed chance, or the stage would likely have been the same.

Some patients with a good outlook also decide a case is not worth their time and energy. Our article on whether it is worth suing for a delayed breast cancer diagnosis talks through that choice.

How do we investigate a delayed breast cancer diagnosis case in Pennsylvania?

We investigate before we file anything. Pennsylvania law requires expert support from the start, so the work begins with records and specialists.

• A first conversation. You talk with an attorney or a member of our nursing staff about what happened and when.
• Gathering records. We collect doctors’ office notes, imaging reports, and the images themselves. We may also collect pathology reports and biopsy slides, imaging center letters, referral orders, and patient portal messages.
• Building a timeline. We line up each symptom, visit, test, and result. We make sure we understand what medical care and treatment was provided, and when.
• Independent expert review. We work with specialists in radiology, pathology, oncology, gynecology, and primary care. A radiologist may reread the images, and a pathologist may review the slides. A doctor in the same field as each doctor involved reviews the care. An oncologist, a cancer specialist, reviews causation. Pennsylvania’s MCARE Act sets rules for experts. It generally requires an expert on the standard of care to practice in the same or a similar specialty as the doctor involved. That is one reason we use specialists.
• A certificate of merit. Pennsylvania requires a written statement from a qualified medical professional that the claim has merit, for each licensed professional sued. We also require a certificate of merit from an oncologist who is trained in the progression and treatment of breast cancer.
• Filing suit. If the expert review supports a case, we file in court. Both sides then exchange written questions and answers, records and testimony, including depositions, which are sworn questions before trial.

How long do you have to file in Pennsylvania?

Generally, two years. For a living patient, the clock usually starts on a key date. That is when the patient knew, or should have known, they were harmed and that medical care may have caused it. In delayed diagnosis of breast cancer cases, that date is often near the cancer diagnosis, not the missed visit.

After a death, wrongful death and survival claims generally must be filed within two years of the date of death. There are exceptions, and the rules can be hard to apply. Our page on how long you have to file a medical malpractice suit in Pennsylvania explains more, and a lawyer can review your dates.

What damages can be recovered in a delayed breast cancer diagnosis case?

Damages are the legal categories of loss a jury can consider once a case is proven. They differ for a living patient and for a family after a death.

For a living patient

• Past and future medical expenses.
• Lost wages and lost earning capacity.
• Pain and suffering.
• Embarrassment and humiliation.
• Loss of the ability to enjoy life’s pleasures.
• Disfigurement, such as the loss of a breast.

A spouse may also have a claim for the loss of their partner’s companionship and help, called loss of consortium.

After a death

Pennsylvania’s Wrongful Death Act allows claims for a spouse, children, or parents of the deceased patient. These claims cover medical, funeral, and estate costs. They also cover the services, support, guidance, and companionship the family members lost.

Pennsylvania’s Survival Act carries on the claim the patient would have made had they lived. That can include her pain and suffering between the time of the missed diagnosis and death, and lost earning capacity.

Damages are presented through the patient’s and family’s testimony, medical records, and experts, such as an oncologist or an economist.

Which article fits what happened to you?

Find the situation closest to yours below. Each article explains what careful care looks like in that setting and when a delay may support a claim.

• My doctor never told me to get a mammogram – Patients whose yearly visits never included a talk about screening
• Dense breasts: what your doctor should have told you and done – Patients whose imaging reports said dense breasts, especially with other risk factors
• I was told I was too young for breast cancer – Patients under 40 whose lump or risk for breast cancer was dismissed because of age
• My doctor said the lump was nothing, or told me to wait and see – Patients whose lump was not imaged, or was watched with no plan for follow-up
• I had a normal mammogram, but I could feel a lump – Patients whose lump was still there after a normal mammogram
• A breast infection that didn’t get better on antibiotics – Patients treated more than once for a red, swollen breast
• Nipple changes your doctor should not have brushed off – Patients with discharge, a newly turned-in nipple, or a rash that would not heal
• A swollen lymph node in the armpit that no one checked – Patients with an armpit lump that lasted or grew
• Lobular breast cancer: when it feels like thickening, not a lump – Patients who report thickening or a change in breast shape
• Breast implants and missed breast cancer – Patients with implants whose lump or change was blamed on the implant
• My doctor said it was extra breast tissue or an extra nipple, but it was cancer – Patients whose lump or spot was called harmless extra tissue
• My biopsy was benign, but it turned out to be cancer – Patients whose biopsy result did not fit the images
• The report said come back in six months, and no one followed up – Patients whose recheck was never scheduled
• Is it worth suing for a delayed breast cancer diagnosis? – Patients with a good prognosis  weighing whether to pursue a claim