If you were diagnosed with colorectal cancer before 50, you have probably been asking why. You do not fit the profile medicine has traditionally associated with this disease. You were not supposed to be at risk yet. And for most patients in your position, no one has given a clear answer.
New research published in one of the world’s leading medical journals may be the beginning of one.
A Peer-Reviewed Study Names a Specific Herbicide
On April 21, 2026, Nature Medicine published a peer-reviewed study linking picloram—the active ingredient in Tordon, a herbicide manufactured by Corteva Agriscience, the successor to Dow Chemical’s agricultural division—to early-onset colorectal cancer in adults under 50.
The researchers, based at the Vall d’Hebron Institute of Oncology in Barcelona, used epigenetic fingerprinting to analyze tumor DNA across nine independent patient cohorts. They tested 14 pesticides. Picloram produced the strongest association with early-onset disease—stronger than glyphosate, the active ingredient in Roundup.
They also found a molecular pattern in tumors from counties with higher picloram use: fewer mutations in the APC gene, which controls normal cell growth in the colon. The researchers say this may indicate a biological pathway distinct from typical colorectal cancer—one that external exposure, rather than hereditary factors, could drive.
Oncologists at Dana-Farber Cancer Institute published a companion analysis in the same journal issue and were direct about what the research does and does not prove. The science is observational. It does not yet establish that picloram causes cancer. Further study is needed.
What it does establish is a signal serious enough to be published in Nature Medicine—and a named manufacturer with six decades of history producing and distributing this compound.
Who Makes Tordon and How Long They Have Known
Dow Chemical first registered picloram with the EPA in 1964. It has been classified as a Restricted Use Pesticide since 1978, meaning licensed commercial applicators use it—not homeowners. Corteva Agriscience, which inherited the Tordon product line through the Dow-DuPont merger, continues to manufacture and sell it today under brands including Tordon 22K, Tordon K, Tordon RTU, and Grazon P+D.
The EPA’s current carcinogenicity classification for picloram dates to 1995—three decades before the Nature Medicine research existed. As of publication in May 2026, Corteva has not issued any public statement responding to or addressing the Nature Medicine study.
Who This Research Affects in Illinois
Picloram is not used on corn and soy. That matters for Illinois, where row crops dominate most of the state. But picloram’s footprint here is real, and it is concentrated in specific places and occupations.
The herbicide is applied to pasture and forage acreage in southern and west-central Illinois. It is also used on roadways, utility corridors, and railroad rights-of-way throughout the state—maintained by IDOT, county highway departments, Class I railroads, and electric utilities. Beyond direct contact, EPA’s own dietary risk data identifies beef and dairy from animals grazing on treated land as an indirect exposure pathway.
The research is relevant to you if:
- You were diagnosed with colorectal cancer before age 50
- You grew up or spent significant time near treated pasture, farmland, or rural roadsides in Illinois
- You worked in agriculture, highway maintenance, railroad, or utility operations with herbicide exposure
- Your family raised cattle or other livestock on pasture land in rural Illinois
Why Talking to an Attorney Now Matters
The legal landscape around herbicide liability is actively shifting. The U.S. Supreme Court heard arguments on April 27, 2026 in Monsanto Co. v. Durnell, a case that will determine whether people harmed by EPA-registered herbicides can bring state-law claims against manufacturers. A ruling is expected by late June 2026.
If the Court rules in favor of plaintiffs, the window for pursuing claims related to herbicide exposure could open significantly—and the families who have already documented their histories and spoken with an attorney will be positioned to act quickly. Waiting for the ruling before having that first conversation puts you behind.
This article will be updated with the Court’s decision and its implications for picloram claims in Illinois.
Do You Have a Potential Picloram Exposure Claim?
Not every diagnosis of early-onset colorectal cancer indicates negligence or creates a legal claim. However, certain circumstances may warrant legal consultation:
Red Flags to Watch For
- Rural Illinois residence or work history: Living, working, or raised on land in picloram-use counties
- Occupational exposure: Work in agriculture, highway maintenance, railroad, or utility operations
- Livestock exposure: Family history of cattle or livestock on treated pasture
- Documented herbicide application: Records showing picloram or Tordon use on your property
- Timing of diagnosis: Cancer diagnosis following known or likely exposure period
- Multiple affected family members: Cluster of EOCRC cases in same geographic area or family
Questions to Ask Yourself
- Do you have a history of living or working in southern or west-central Illinois with likely herbicide exposure?
- Were you raised on or near treated pasture or agricultural land?
- Has your family experienced cattle grazing on potentially treated land?
- Do you have documentation of herbicide applications on your property?
- Are there other family members or neighbors with similar diagnoses?
If you answered “yes” to any of these questions, consulting with an attorney experienced in toxic exposure cases may be valuable.
How to Protect Your Rights
If you believe you may have been harmed by picloram exposure, taking prompt action can help protect your legal rights.
1. Consult with a Toxic Exposure Attorney
An experienced attorney can:
- Evaluate whether you have a viable claim
- Explain your legal options and timeline
- Help you understand the impact of the pending SCOTUS ruling
- Gather evidence of exposure and causation
- Navigate complex medical and regulatory issues
- Advocate for fair compensation
2. Document Your Exposure History
Create a detailed timeline including:
- Dates and locations of residence and employment
- Properties where you lived or worked in rural Illinois
- Any documented herbicide applications (Tordon, picloram, or related products)
- Livestock history and pasture use
- Types of work (agriculture, highway, railroad, utility maintenance)
- Names of employers or property owners
- Any health concerns documented during exposure period
3. Preserve Medical Records
Collect and organize:
- Complete cancer diagnosis and treatment records
- Pathology reports and tumor analysis
- Medical imaging and test results
- Family medical history documentation
- Any records showing timing of diagnosis and treatment
4. Gather Environmental Evidence
Preserve documentation of:
- Historical property records
- USDA or EPA pesticide application records for your county
- County or state agricultural records
- Utility company right-of-way maintenance records (if applicable)
- IDOT highway maintenance records (if applicable)
- Photographs of property and surrounding land use
5. Avoid Settling Without Legal Review
- Do not accept any settlement offer from Corteva or its insurers without consulting an attorney
- Do not sign any documents without understanding the implications
- Do not discuss your case publicly or on social media
Most toxic exposure attorneys offer free consultations and work on a contingency fee basis, meaning you don’t pay unless you recover compensation.
Take the First Step
If you were diagnosed with colorectal cancer before 50 and have a history of living or working near treated land in Illinois, we encourage you to reach out. Even if you’re unsure whether you have a case, a consultation can provide clarity and help you understand your options.
Contact Block Law Today
If you were diagnosed with colorectal cancer before 50 and have a history of living or working in rural Illinois with likely herbicide exposure, don’t wait to seek legal advice. The statute of limitations may limit your time to file a claim, and the pending Supreme Court ruling could significantly affect your options.
Block Law offers free, confidential consultations for potential picloram and toxic exposure cases. Our experienced attorneys will listen to your story, review your situation, and provide honest guidance about your legal options.
You deserve answers, accountability, and justice. Let us help you take the first step toward protecting your rights and securing the compensation you deserve.
Call us today at 815-726-9999 or request a free consultation.
