Cancer has traditionally been a disease of old age.

But younger Australians aged in their 30s and 40s are increasingly being diagnosed with cancer and scientists are desperate to understand why. 

Could it be processed foods, plastics, or exposures during childhood or birth?

Today, Dr Norman Swan on his Four Corners investigation into what could be causing the sharp rise in cancer rates among younger generations and what can be done about it.

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Dr Norman Swan, Four Corners reporter and host of The Health Report