Rare cancer cases strike in California community as families demand answers

A cluster of rare cancer diagnoses has sparked concern and prompted environmental testing in Ladera Ranch, California, although state health officials say no specific cause has been identified.

At least six children in the area have been diagnosed with Ewing sarcoma , according to federal officials and local reporting.

This exceptionally rare cancer, which forms in the bone or nearby soft tissue, primarily occurs in adolescents and young adults, per the National Cancer Institute.

WOMAN LOSES BEST FRIEND TO OVARIAN CANCER, THEN RECEIVES SAME DEVASTATING DIAGNOSIS MONTHS LATER "Knowing that this is a very rare cancer diagnosis amplifies the concerns," Dr.

Janet Yoon, a pediatric oncologist and sarcoma specialist at City of Hope in Los Angeles, told Fox News Digital.

"Anytime you hear of cases in a geographic location, it does raise some concerns ...

I can completely understand why further investigation is being done." Following the March 2026 death of 17-year-old Brody Matteson from complications of treatment for Ewing sarcoma, more families began speaking publicly about rare cancer diagnoses in the community, according to local reports.

Some residents – including Matteson's father, Dustin Matteson – have suggested the illnesses could be linked to the community's use of herbicides and pesticides, which prompted calls for a broader environmental investigation.

"We don't have a clear line of evidence for pesticides, but it is one of the things that concerns us," Matteson said to NBC Los Angeles in July.

ALCOHOL TIED TO SURPRISING CANCER DEATH PATTERN IN ADULTS UNDER 55, RESEARCHERS FIND In 2024, prompted by residents’ concerns, the California Department of Public Health conducted a county-level review in an attempt to determine whether pesticide use in the community could have played a role in the development of certain cancer types.

"That analysis did not find an unusual pattern at the county level, but the data available at the time was​ limited," the CDPH stated on its website.

The agency is now conducting a second review of cancer incidence data for the Ladera Ranch area.

"CDPH currently estimates the assessment will be completed in fall 2026, although the timeline may change based on the scope and complexity of the review and any additional information that may need to be evaluated," the agency stated.

"At this time, our colleagues at CalEPA (California Environmental Protection Agency) and its boards, departments and offices have not identified any immediate environmental hazards." The CDPH stated that it is not yet known whether diagnoses of Ewing sarcoma and other cancer types are higher than expected in the Ladera Ranch community – or whether environmental factors can increase the risk.