A worrying number of rare cancer cases has emerged in Ladera Ranch, California, leading to heightened concern and environmental testing in the area. Health officials from the state have reported that they have not yet determined a specific cause for these cases.
Reports indicate that at least six children in Ladera Ranch have been diagnosed with Ewing sarcoma, an uncommon cancer that affects the bone or surrounding soft tissue. According to the National Cancer Institute, this type of cancer is most frequently diagnosed in teenagers and young adults.
Dr. Janet Yoon, a pediatric oncologist and specialist in sarcomas from City of Hope in Los Angeles, expressed her concern, stating, “Knowing that this is a very rare cancer diagnosis amplifies the worries. Whenever there are cases in one spot, it prompts investigations, and I completely understand the need for further examination.”
In March 2026, the community lost a 17-year-old boy, Brody Matteson, who passed away from complications related to Ewing sarcoma. His death led to more families in Ladera Ranch speaking out about similar rare cancer cases they had encountered.
Many locals, including Brody’s father, Dustin Matteson, have raised questions about whether the cancers might be associated with the use of herbicides and pesticides in the area, which has led to demands for a broader environmental investigation. Matteson shared his concerns with NBC Los Angeles, saying, “We don’t have a clear line of evidence for pesticides, but it is one of the things that worries us.”
In response to community concerns, the California Department of Public Health carried out a review in 2024 to evaluate whether pesticide use could be related to the rise in certain cancer cases. Although the review did not identify any unusual patterns at the county level, officials noted that the data available at the time was limited. They are currently working on a new assessment of cancer incidence in Ladera Ranch, with findings expected by fall 2026.
While the California Environmental Protection Agency has not found any immediate environmental hazards, the health department is now conducting a more thorough investigation into cancer data for the area. Furthermore, First Assistant U.S. Attorney Bill Essayli has requested the Environmental Protection Agency to look into potential environmental factors that might have contributed to the pediatric cancer cases.
Over the summer, community meetings saw a large turnout as residents sought answers. Meanwhile, the Ladera Ranch Maintenance Corporation, which manages the community, has temporarily stopped using certain landscape chemicals and is reviewing its landscaping practices.
As the investigation proceeds, some residents have also reported other cancer diagnoses, such as glioblastoma, although it’s unclear if these cases are related to the initial concerns about Ewing sarcoma.
On September 14, a research team from California State Fullerton began collecting soil and water samples from local parks to further investigate potential environmental causes. Dr. Jennifer Piazza, who leads the research team, emphasized that the tests would look for heavy metals and pesticides while reminding residents that findings do not automatically establish a connection to the pediatric cancer cases.
LADERANC’s management has extended its sympathies to affected families, stating that they are taking these health concerns seriously and will continue to cooperate with public health agencies.
As for Ewing sarcoma, Dr. Yoon explained that no confirmed genetic or environmental causes have been identified. “It’s important to note that Ewing sarcoma often shows up as persistent pain rather than typical injuries,” she shared, urging families to seek medical advice if pain persists, worsens, or interrupts daily routines.
As residents of Ladera Ranch seek clarity on this troubling situation, the focus remains on uncovering any links between environmental factors and the rise in cancer cases among local children.
