"Whenever you hear that there's a possible cancer cluster, you should be concerned," ABC News' Chief Health and Medical Editor Dr. Richard Besser said. "But it's so hard to know with a cancer cluster whether it's truly related to something in the environment or just a coincidence."
But parents whose children are on campus every day told KABC-TV that they had not been made aware of the health issues.
"I'm afraid. My children spend all day here and if it's not safe, it's a big concern. Everybody is afraid of cancer," said Carrie Krase.
"My biggest concern is that we find out more information about what exactly is going on in the middle school and what environmental issues are possibly a problem for not only the teachers but all the children," said Seth Jacobson, who has a sixth-grader who attends the school.
Malibu High School Parent Teacher Student Association President Amy Young declined to comment to ABC News.
Executive Environmental, which was hired by the district to perform testing declined to comment to ABC News. Gary Bradbury declined to comment to ABC News.