A newly released report from the Iowa Cancer Registry indicates a concerning rise in cancer diagnoses and fatalities in Iowa for 2026. The report, published on March 13, 2026, estimates that approximately 21,700 new cancer cases will be identified statewide, with a projected 6,400 Iowans expected to die from the disease—an increase of 100 deaths compared to 2025.
In Johnson County, the report forecasts that 165 residents will succumb to cancer, while 6,795 individuals are anticipated to survive the disease. This data highlights a pressing public health issue as the state grapples with rising cancer rates.
Collaboration with Agricultural Health Study
This year, the Iowa Cancer Registry collaborated with the Agricultural Health Study, an ongoing research initiative examining how agricultural practices impact farmers’ health in Iowa and North Carolina. Mary Charlton, a professor of epidemiology at the College of Public Health and co-author of the report, noted that this partnership was prompted by public concerns regarding pesticide exposure among farmers.
The study has involved a significant number of participants, including 31,433 male farmers and 22,145 women, comprising either spouses of farmers or female farmers themselves. Eligibility for participation required individuals to obtain or renew a pesticide license. Preliminary findings from the study indicate that farmers have experienced about 13 percent fewer cancer cases than expected when compared to Iowa’s general population. Spouses of farmers show a similar trend, with 10 percent fewer cancer cases than anticipated.
Charlton explained that these lower rates might be attributed to the “healthy worker effect,” where individuals in physically demanding jobs, like farming, tend to maintain better health. Additionally, lifestyle factors could play a role, as farmers and their spouses reported lower levels of smoking and drinking compared to the broader population.
Complex Relationship Between Cancer and Environmental Factors
Despite the encouraging statistics, Iowa still ranks second in the nation for cancer rates. Charlton emphasized that while pesticides are a known risk factor, the relationship is complex, as not all chemicals found in pesticides are carcinogenic. “Cancer is not one disease. Cancer is hundreds, if not thousands, of diseases,” she stated, underscoring the challenges in linking specific chemicals to cancer in humans.
Another potential contributor to Iowa’s cancer rates is nitrate runoff in drinking water. However, Charlton pointed out that the state lacks comprehensive data to identify high-risk water sources. “Not very many of us drink from one water source our entire lives,” she said, explaining that the absence of a robust database complicates efforts to track cumulative exposures over time.
She also noted that Iowa’s pesticide reporting system is less sophisticated compared to systems in states like California, which track pesticide applications in detail. This level of granularity enables better assessment of potential health impacts on populations living near treated areas.
Charlton concluded that the report is intended to address public concerns regarding environmental risk factors associated with cancer. “We know that Iowans are concerned about environmental risk factors, and we hope this report provides some helpful context while reinforcing the need for more research and data collection in that area,” she said.
As the state faces these rising cancer statistics, the importance of continued research and improved data collection becomes increasingly evident. The Iowa Cancer Registry’s findings not only illuminate the current landscape of cancer in Iowa but also highlight the urgent need for ongoing studies to better understand the factors influencing cancer rates.
