From Port Huron Times Herald:

Five children in southeastern St. Clair County have been diagnosed with a rare form of kidney cancer in the past four years, and officials are trying to find out why.

The answer so far: They’re investigating.

This isn’t the first time the St. Clair County Health Department has investigated reports of a cancer cluster — or this possible cluster involving Wilms’ tumor, a cancer which is diagnosed in about 550 cases annually in the United States.

The county began an investigation in 2009 into the incidence of Wilms’ tumor, said Susan Amato, the department’s director of health education and planning. The state Department of Community Health determined further investigation wasn’t needed, she said.

Several years before that investigation, the county health department contracted for a firm to research a possible link between petroleum refining in Chemical Valley and cancer in St. Clair County. No conclusive evidence was found, Amato said.

Officials reopened the 2009 investigation after the latest case of Wilms’ tumor — Ireland Kulman, a 6-month-old girl from Marine City who was diagnosed in March — sparked concerns within the community.

According to the Centers for Disease Control and Prevention in Atlanta, a cancer cluster is a greater-than-expected number of cancer cases that occurs within a group of people in a geographic area during a period of time. According to the CDC’s website, cases are more likely to represent a cluster if they involve one type of cancer, a rare type of cancer or a type of cancer in a group not usually affected by that cancer.

But determining if a number of cancer cases in an area constitutes a cluster is not easy . . . .

More.

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