Agent Orange & Cancer
Agent Orange Cancer Nexus Letters From a Radiation Oncologist
If you developed cancer after herbicide exposure in Vietnam, the Korean DMZ, Thailand, or aboard ship, a specialty medical nexus opinion can clarify the connection your VA claim needs — especially for cancers the presumptive list leaves out.
- Board-Certified Radiation Oncologist
- Retired U.S. Army Lieutenant Colonel
- Enlisted Former NBC / CBRNE Specialist
- Board-Certified Radiation Oncologist
- Retired U.S. Army Lieutenant Colonel
- Enlisted Former NBC / CBRNE Specialist
Led by Dr. C.M. Williams, MD
Your Claim, Reviewed by a Cancer Specialist Who Served
Dr. Williams is a board-certified radiation oncologist and a retired U.S. Army Lieutenant Colonel. She has spent her career treating cancer and translating complex medicine into plain language — and she understands military service and toxic exposure from the inside.
That combination is rare in the nexus-letter world, where many opinions come from clinicians who never treated cancer. Your case is reviewed by a specialist physician who can speak to your cancer type, stage, and biology with authority — and write the medical reasoning the VA needs to see.
How a Nexus Opinion Helps
How a Nexus Opinion Helps Your Agent Orange Claim
Many Agent Orange cancers are presumptive — but a presumption only goes so far. A specialty nexus opinion is what carries the medicine when your cancer is not on the list, your service window is questioned, or a claim has already been denied.
Establishes the medical link
Dr. Williams reviews your diagnosis, pathology, and timeline and explains, in clear medical terms, how herbicide exposure relates to the type of cancer you developed — the reasoning a VA rater needs to see.
Covers non-presumptive cancers
The VA does not list every cancer as presumptive. Where your cancer falls outside the presumptive list, a well-reasoned opinion can still establish a direct service connection when the medical evidence supports one.
Answers denials and unclear evidence
A prior denial or a confusing C&P exam is not the end of the road. An independent oncologist's opinion can address the specific medical gaps the VA cited and put your evidence on firmer footing.
Exposure by Branch & MOS
Agent Orange Exposure by Branch & MOS
Herbicide exposure was never limited to ground troops in Vietnam. Your branch and military occupational specialty (MOS) shape how exposure is documented — and where a medical opinion adds the most weight.
Army & Marine Corps
Infantry, combat engineers, and ground troops in Vietnam, plus units that served along the Korean DMZ between 1967 and 1971.
Air Force
Operation Ranch Hand aircrews and the maintainers and reservists who flew or serviced the C-123 aircraft used to spray herbicides.
Navy & Coast Guard
Blue Water and Brown Water personnel aboard ships offshore and on Vietnam's inland waterways.
Cancers the VA Recognizes as Linked to Agent Orange
These are among the cancers the VA presumes are connected to herbicide exposure. Dr. Williams also reviews non-presumptive cancers case by case.
- Prostate cancer
- Respiratory cancers, including lung cancer
- Non-Hodgkin lymphoma
- Hodgkin's disease
- Chronic B-cell leukemias
- Multiple myeloma
- Bladder cancer
- Some soft tissue sarcomas
Non-Presumptive Cancers
Not on the List? That's Where a Nexus Opinion Matters Most
Exclusion from a presumption is not the same as no path. These cancers usually require a direct service-connection opinion linking the diagnosis to dioxin (TCDD) exposure — exactly the medical reasoning a specialty review provides.
Dioxin (TCDD)
Pancreatic cancer
Not on the herbicide presumptive list — service connection generally requires a direct medical causation opinion.
Dioxin (TCDD)
Stomach & other GI cancers
Outside the presumptive list in most cases; a causation opinion can connect the diagnosis to documented exposure.
Herbicide / dioxin
Melanoma
Generally non-presumptive and reviewed individually on the medical evidence.
Osteosarcoma, chondrosarcoma, Kaposi's sarcoma, and mesothelioma are specifically excluded from the Agent Orange presumptive list — but a direct service-connection opinion can still establish the link when the evidence supports it.
Understanding Agent Orange Exposure
Agent Orange was a tactical herbicide used widely during the Vietnam War era. The VA presumes exposure for veterans who served in certain locations and time periods — including Vietnam, the Korean DMZ, and several locations added under the PACT Act — so exposure itself does not have to be proven separately.
For presumptive cancers you only need to meet the service requirements. A specialty medical opinion still matters when a claim involves a non-presumptive cancer, a secondary condition, or evidence the VA finds unclear.
An Honest, Evidence-Based Opinion
A nexus letter never guarantees approval, and Dr. Williams will tell you candidly whether the medical evidence reasonably supports a connection in your case. A formal opinion is only provided when it does — and final decisions always rest with the U.S. Department of Veterans Affairs.
Frequently Asked Questions
Agent Orange & Cancer Questions
My prostate cancer is presumptive — do I still need a nexus letter?
Often no. If your cancer is presumptive and you meet the service location and time requirements, you generally do not need to prove causation. A nexus opinion becomes valuable when the diagnosis is complex, a secondary condition is involved, your service window is disputed, or the claim was denied on other grounds.
What if my cancer is not on the Agent Orange presumptive list?
A cancer that is not presumptive can still be service-connected on a direct basis. That is exactly what a nexus opinion is for — evaluating, with current medical evidence, whether your specific diagnosis is medically linked to your documented herbicide exposure.
I served in the Air Force or aboard ship, not in-country. Can you still help?
Possibly. Herbicide-exposure paths reach C-123 aircrews and maintainers, Blue Water and Brown Water Navy personnel, and units in Korea and Thailand. The right service and exposure facts matter, and a specialty review can help interpret them medically.
My Agent Orange claim was already denied. Is it worth another look?
A prior denial does not automatically mean the case cannot be reviewed. A focused, evidence-based medical opinion may clarify the medical issues the VA found unclear. Each case is assessed individually on its merits.
Does a consult guarantee a nexus letter?
No. The VA Case Strategy Consult helps determine whether a nexus opinion may be medically supportable. A formal opinion is only provided when the medical evidence reasonably supports a connection, and final decisions always rest with the U.S. Department of Veterans Affairs.
Get in Touch
Have a Question About Your Case?
Send us a message and we’ll get back to you. If you’re ready to begin, you can also schedule a consult directly.