A cancer misdiagnosis can mean months, or even years, of lost time that a patient did not have to spare.
Whether a doctor missed the warning signs, misread test results, or told a patient their tumor was benign when it was not, the outcome is often the same: a treatable cancer becomes much harder to treat.
If this happened to you or someone you love, you may have legal options to hold the responsible doctor or hospital accountable.
Prior results do not guarantee a similar outcome.
How Often Does Cancer Misdiagnosis Actually Happen?
Cancer misdiagnosis is more common than most people realize.
A 2024 study published in BMJ Quality & Safety by researchers at Johns Hopkins found that cancers make up roughly 1.5 million of the serious diagnoses doctors handle each year in the United States, and that dangerous diseases in general, cancers included, are misdiagnosed at a weighted average error rate of about 11.1 percent, with serious harm resulting in about 4.4 percent of those cases.
That same research estimated that around 795,000 Americans are permanently disabled or die every year because a dangerous disease was misdiagnosed somewhere in the healthcare system, and that cancers account for about 13 percent of those serious harms, with lung cancer alone landing among the five most harmful conditions to misdiagnose.
Those numbers matter because they show this isn’t a case of one careless doctor here or there. It’s a well-documented, measurable pattern in how the healthcare system handles diagnosis, and it’s exactly the kind of pattern medical malpractice law was built to address.
What Counts as a Cancer Misdiagnosis?
Cancer misdiagnosis is not one single thing. It can happen at almost any point in the diagnostic process, and it takes a few different forms.
A missed diagnosis happens when a doctor overlooks clear signs of cancer entirely, sometimes because they didn’t order the right test, sometimes because they misread the one they did order.
A delayed diagnosis happens when the cancer is eventually caught, but only after a delay that let it progress further than it should have. This is one of the most common forms of cancer malpractice, since early-stage cancer is often far more treatable than late-stage cancer.
A wrong diagnosis happens when a doctor identifies the wrong type of cancer, or misses that a mass is cancerous and instead tells the patient it’s benign, or vice versa. This can lead to unnecessary, harmful treatment for a condition the patient doesn’t actually have, or a false sense of security about a tumor that is actually spreading.
Doctors and hospitals can make these mistakes in a lot of different ways, including:
Failing to order imaging, biopsies, or bloodwork that the patient’s symptoms clearly called for
Misreading a mammogram, CT scan, MRI, or biopsy slide
Dismissing a patient’s reported symptoms as something less serious, such as stress or minor illness
Losing, mislabeling, or failing to follow up on lab results
Failing to refer a patient to an oncologist or specialist when red flags were present
Errors in the pathology lab that lead to a mistaken reading of tissue samples
Which Cancers Are Misdiagnosed Most Often?
Some cancers are caught late more often than others, usually because their early symptoms overlap with less serious, more common conditions. The cancers most frequently involved in misdiagnosis claims include:
Cancer Type | Why It’s Often Misdiagnosed |
Breast cancer | Mammograms can be misread, or a lump may be dismissed as a benign cyst |
Lung cancer | Early symptoms, like a cough or shortness of breath, are often mistaken for bronchitis or asthma |
Colorectal cancer | Symptoms overlap with hemorrhoids, IBS, or other digestive issues, and patients are sometimes considered “too young” to be screened |
Prostate cancer | Slow-growing tumors are sometimes dismissed as normal aging, or PSA test results are not followed up on |
Skin cancer, including melanoma | A suspicious mole may be visually assessed rather than biopsied |
Cervical and ovarian cancer | Symptoms can resemble common gynecological issues, delaying further testing |
What Has to Be Proven in a Cancer Misdiagnosis Case?
Not every missed or delayed cancer diagnosis is medical malpractice. Doctors are not required to be perfect, and cancer can genuinely be hard to detect in its earliest stages even when a doctor does everything right. To have a valid claim, your case generally needs to show:
A doctor-patient relationship existed. The doctor accused of the error was actually responsible for your care.
The doctor failed to meet the accepted standard of care. In other words, a reasonably skilled doctor in the same specialty, faced with the same symptoms and test results, would have caught the cancer, or would have ordered further testing.
That failure directly caused harm. This is often the hardest part to prove. Your legal team has to show that the delay in diagnosis actually made your prognosis worse, whether that means the cancer advanced to a later stage, required more aggressive treatment, or became terminal when it wouldn’t have been otherwise.
You suffered real, measurable damages as a result, whether financial, physical, or emotional.
Proving the second and third points almost always requires an outside medical expert to review your records and explain, in plain terms, where the care fell short and what it cost you.
What Compensation Can You Recover?
If your cancer was misdiagnosed or its diagnosis was delayed because of medical negligence, you may be entitled to compensation covering both what already happened and what you’re likely to face going forward. That can include:
Past and future medical bills, including additional treatment made necessary by the delay
Lost wages, if the illness or its treatment kept you out of work
Loss of future earning capacity, if your prognosis affects your ability to work long-term
Pain and suffering
Loss of a chance at a better outcome, a concept New York courts recognize when a delayed diagnosis reduced a patient’s odds of survival or recovery, even if it didn’t cause the cancer itself
Wrongful death damages, if the misdiagnosis contributed to a loved one’s death
Every case is different, and the value of a claim depends heavily on the specific facts, including how advanced the cancer was at diagnosis versus how advanced it would have been with timely care. An attorney who has handled these cases before can help you understand what a fair outcome actually looks like for your situation.
If you or a family member may have been harmed by a doctor's error in New York, the team at Porter Law Group can review the medical records and your options at no cost.
How Long Do You Have to File a Claim in New York?
New York law sets strict deadlines for filing a medical malpractice claim, and missing one usually means losing your right to sue entirely, no matter how strong the case is otherwise.
Type of Claim | Deadline | Legal Source |
Medical malpractice | 2 years and 6 months from the act of malpractice, or from the end of a continuous course of treatment for the same condition | |
Wrongful death | 2 years from the date of death | |
Claims involving a minor | The 2.5-year clock is paused, or “tolled,” until the child turns 18, though other limits can apply | |
Claims against a public hospital or municipal provider | A Notice of Claim must generally be filed within 90 days of the incident |
These deadlines can be more complicated than they look, especially in cases involving a delayed diagnosis, where it may not be obvious exactly when the “malpractice” legally occurred.
It’s worth talking to an attorney as soon as possible after you suspect something went wrong, even if you’re not sure yet whether you have a case.
Summing It Up
A missed or delayed cancer diagnosis can cost a patient time they can’t get back, and that loss is often made worse by the feeling that it should never have happened in the first place.
At Porter Law Group, we’ve built our medical malpractice practice around exactly this kind of case: reviewing the medical record closely, working with qualified oncology and radiology experts, and building a claim that reflects what the delay actually cost our client, medically and financially.
We handle these cases on a contingency fee basis, which means there’s no upfront cost to you, and you don’t pay us anything unless we recover compensation on your behalf.
If you’re not sure whether what happened to you or your loved one qualifies as malpractice, that’s a normal place to start. Reach out, walk us through what happened, and we’ll help you figure out where you stand.
Frequently Asked Questions
How do I know if my cancer diagnosis was delayed because of a doctor’s mistake, or just because cancer is hard to catch early?
This is exactly what a medical expert review is for. An independent oncologist or radiologist looks at your imaging, lab results, and medical records to determine whether your symptoms and test results should have prompted further testing sooner. If they conclude a reasonably careful doctor would have caught it earlier, that supports a malpractice claim.
Can I still sue if the doctor who missed my cancer no longer works at that practice or hospital?
Yes. Your claim is based on what happened during your care, not on whether the doctor is still there. The hospital or practice can often be named in the claim as well, depending on how the doctor was employed at the time.
What if I already started cancer treatment? Does that affect my ability to sue?
No. Pursuing treatment does not waive your right to file a claim for the malpractice that delayed your diagnosis. Many clients come to us after treatment has already begun, once they’ve had time to understand how much the delay affected their prognosis.
Do I need to have a doctor already confirm malpractice before I contact a lawyer?
No. Part of what a medical malpractice attorney does is arrange for an independent medical expert to review your case. You don’t need to have that review done yourself before reaching out.
What if my loved one died from a cancer that should have been caught earlier?
You may be able to bring a wrongful death claim under EPTL § 5-4.1, which allows a personal representative of the estate to seek compensation for the family’s losses. These claims must generally be filed within two years of the date of death.
Prior results do not guarantee a similar outcome.
Contact Us
If a delayed or missed cancer diagnosis has affected you or someone you love,
Porter Law Group is here to help you understand your options.
Call us at 833-PORTER9 or email info@porterlawteam.com to schedule a free consultation.
