Radiation Therapy Overdoses and Errors: How They Happen and Your Rights in New York

Radiation therapy is one of the most effective tools against cancer, and most patients who receive it are treated safely.

But radiation differs from most treatments in one important way. It passes through a long chain of physicians, physicists, dosimetrists, therapists, and software, and a mistake made early in that chain can be repeated at every session.

When the checks meant to catch it fail, a patient can get far more radiation than intended, or radiation in the wrong place, with consequences that may last a lifetime.

If you or someone you love went through radiation and something seems wrong, this article explains how these errors happen, how to tell an error from an expected side effect, and what rights you may have under New York law.

How a Radiation Error Happens

A course of external beam radiation is built in stages:

1. A planning CT scan, sometimes combined with MRI or PET

2. The radiation oncologist outlines the tumor and the nearby healthy organs that must be protected

3. A dosimetrist or physicist designs the plan: dose, number of sessions, and beam angles

4. The physician approves the plan, and a physicist checks the calculations

5. The plan is transferred to the treatment machine’s computer system

6. The patient is positioned and imaged before each session

Each step is a place an error can enter:

• A prescription entered with the wrong dose or number of sessions

• Units confused, such as centigray and gray

• A wrong beam calculation

• A plan transferred with a setting missing, or the wrong version loaded

• A miscalibrated machine, historically the most dangerous category because it can affect many patients at once

• A patient set up in the wrong position, or treated on the wrong side, because imaging wasn’t checked

What sets radiation apart from a surgical mistake is repetition. A flawed plan doesn’t deliver one bad dose. It can deliver the same bad dose at every session for weeks before anyone notices.

The Safeguards That Should Catch It

Modern radiation oncology relies on layers of redundancy, and those layers are the core of the standard of care. A well-run department typically has:

• An independent physics review of the plan before the first session

• Patient-specific quality assurance testing for complex plans

• Physician peer review of the plan in many settings

• Imaging to verify the patient’s position before treatment

• Regular calibration and quality checks on the machines

• Weekly on-treatment visits where the doctor checks how the patient is responding

The American Society for Radiation Oncology (ASTRO) and the American Association of Physicists in Medicine (AAPM) publish safety guidance. They also sponsor the Radiation Oncology Incident Learning System (RO-ILS), a voluntary program for reporting errors and near misses.

Participants can send data to a federally listed patient safety organization, and qualifying information is protected from discovery in lawsuits.

When an overdose happens, the central question is which layer failed and why. A system failure, such as inadequate staffing, poor training, or missing protocols, can matter as much as one person’s mistake.

Is It an Error or an Expected Side Effect?

This is the question most people struggle with. Radiation harms healthy tissue to some degree even when everything is done right. These are all recognized effects:

• fatigue

• skin redness and irritation

• soreness in the treated area

• tissue stiffening or scarring months or years later

Some people react more strongly than others. A severe reaction, or a risk you were warned about that then happened, isn’t automatically negligence.

Radiation pneumonitis is a good example: it’s a known effect of chest radiation even when the plan is correct.

An error is different. It means you received a dose or treatment that departed from what was prescribed or from what the standard of care allows. Signs worth raising with your care team include:

• Skin reactions far more severe, or much earlier, than you were told to expect

• Burns or tissue damage outside the area that was supposed to be treated

• Symptoms that don’t match the treatment described to you

• Staff telling you the plan changed, a machine had a problem, or an error occurred

None of these proves anything alone. But each is a good reason to ask direct questions, request your records, and get an independent opinion from a radiation oncologist who wasn’t involved in your care.

Radiation Safety Oversight in New York

New York knows the stakes firsthand. In 2005, Scott Jerome-Parks was treated for head and neck cancer at St. Vincent’s Hospital in Manhattan. His plan was revised in the treatment software, but the computer crashed repeatedly and the instructions that shaped the beam were never saved. He received a massive overdose and later died.

His case anchored a 2010 New York Times investigation into radiation errors, which identified 174 instances of the wrong location or wrong patient being treated.

Today, the New York State Department of Health oversees radiation-producing equipment under Title 10, Part 16 of the state’s regulations, which include sections specifically governing therapy equipment.

Radioactive materials used in treatments like brachytherapy fall under a program New York runs as a federal “Agreement State.” Hospitals must report certain serious events to the state through NYPORTS, and physician misconduct can be reported to the Office of Professional Medical Conduct.

These systems have limits. A regulatory finding isn’t a malpractice verdict, and the absence of a report doesn’t mean no mistake happened. New York also keeps many internal hospital quality-assurance and peer-review materials confidential.

That’s why radiation cases usually depend on treatment records and expert analysis, not internal incident reports.

When a Radiation Error Becomes Malpractice

A New York malpractice claim requires showing that the provider departed from accepted practice and that the departure was a substantial factor in causing injury. Radiation cases almost always need two kinds of experts:

• A radiation oncologist, on whether the prescription and plan were appropriate

• A medical physicist, on whether the calculations, calibration, and quality checks were done correctly

Together, they must connect the error to the harm. That means showing the injuries came from the excess or misdirected radiation, not the cancer or known treatment effects.

In rare cases, such as radiating the wrong body part, a doctrine called res ipsa loquitur may let a jury infer negligence from the event itself. Courts apply it narrowly in medical cases, and expert support is still usually needed.

A separate theory, lack of informed consent under Public Health Law § 2805-d, applies when the risks and alternatives weren’t properly disclosed.

New York’s Filing Deadlines

Under CPLR 214-a, most malpractice actions must be filed within two years and six months of the error, or of the end of continuous treatment for the same condition. Because this is a treatment error rather than a missed cancer diagnosis, Lavern’s Law generally doesn’t apply.

Continuous treatment matters a great deal in cancer care. Radiation runs for weeks and is followed by months or years of monitoring, and courts may treat that relationship as one course of treatment that delays the deadline. The doctrine has limits and is easy to misjudge.

Shorter deadlines apply in other situations:

• Public facilities, such as NYC Health + Hospitals or certain county and state facilities: a notice of claim usually must be filed within 90 days. It isn’t always obvious whether a hospital is public, so check right away.

• Wrongful death: a wrongful death claim generally must be filed within two years of the date of death.

Because radiation injuries often appear late, speaking with a lawyer early is the safest course.

Talk With a New York Cancer Lawyer

If you suspect a planning or verification failure affected your radiation treatment, the useful first steps are to request your complete records, write down what you experienced and what staff told you, and get an independent opinion from another radiation oncologist.

Our New York cancer lawyers work with radiation oncologists and medical physicists to find out whether the dose you received matched the dose prescribed, and which safeguard failed. You can also see our results in cancer cases and our cancer pages.

Call 833-888-LATE, email info@porterlawteam.com, or request a free case evaluation.

Attorney advertising. This article provides general information and is not legal or medical advice. Prior results do not guarantee a similar outcome. Filing deadlines depend on the facts of each case.

Frequently Asked Questions

How do radiation therapy overdoses happen?

Most start in the planning chain. Causes include a wrong dose or number of sessions in the prescription, a unit mix-up such as centigray and gray, a wrong calculation, a plan transferred to the machine incorrectly, a miscalibrated machine, or a patient positioned wrong. Because the same plan runs at every session, one error can repeat for weeks before anyone notices.

How can I tell a radiation overdose from normal side effects?

Fatigue, skin redness, and soreness in the treated area are expected. Warning signs of a possible error include skin reactions far more severe or much earlier than you were told, burns outside the treatment area, symptoms that don’t match the treatment described, or staff mentioning a plan change or machine problem. An independent radiation oncologist can review your records.

Who can be held responsible for a radiation therapy error in New York?

Depending on where the chain broke, the radiation oncologist, medical physicist, dosimetrist, radiation therapists, and the hospital or treatment center may be responsible. Hospitals can also be liable for their own failures, such as weak quality assurance or understaffing. If a software or machine defect contributed, the manufacturer may face a product liability claim.

What records should I request after a suspected radiation error?

Ask for the written prescription, planning CT and contours, the treatment plan with dose-volume histograms, the physics plan check and quality assurance records, daily treatment records from the record-and-verify system, positioning images, weekly visit notes, and consent forms. New York’s Public Health Law § 18 gives you the right to request your complete chart.

How long do I have to sue for a radiation therapy overdose in New York?

Most malpractice claims must be filed within two years and six months of the error, or of the end of continuous treatment for the same condition, which can matter because radiation is followed by long monitoring. Public hospitals require a notice of claim within 90 days, and wrongful death claims must be filed within two years of death.