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Photo by Tima Miroshnichenko on

The number of people under 50 diagnosed with cancer has surged worldwide in the last three decades but it is not fully clear why, a study said on Wednesday.

Cases of cancer among people aged 14 to 49 rose by nearly 80 per cent, from 1.82 million to 3.26 million, between 1990 to 2019, according to the study published in the journal BMJ Oncology.

While experts cautioned that some of that increase was explained by population growth, previous research has also indicated that cancer is becoming more commonly diagnosed among under-50s.

The international team of researchers behind the new study pointed to poor diet, smoking and alcohol as major risk factors underlying cancer in the age group.

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