Some change in our lifestyles and environments over a generation has caused this increased risk. What, exactly, is a mystery

• Prof Devi Sridhar is chair of global public health at the University of Edinburgh

In the field of global health, we often talk about each generation living longer and healthier lives than their parents. We’ve seen this in the gains in life expectancy, the sharp decrease in child mortality and in the near elimination of many vaccine-preventable diseases. But since the turn of the century this progress has stalled, and in some cases several health metrics have gone backwards.

Take cancer, which was long thought to be a disease linked to old age. While most cancers do indeed still occur in elderly people, a new report highlights that a number of cancers are increasing in people who are under 50, often referred to as “early onset cancer”. The report, undertaken by the World Cancer Research Fund, looked at data from 12 different cancer types in England, the US and the Netherlands over the past 20 years. What they found isn’t pretty.

Prof Devi Sridhar is chair of global public health at the University of Edinburgh

With cancer cases rising fastest in poorer countries, Zainab Shinkafi-Bagudu, president-elect of the Union for International Cancer Control, says Africa needs investment in research, diagnosis and prevention

When Dr Zainab Shinkafi-Bagudu last saw Gloria in Abuja, the young breast cancer patient was so ill that she was in hospital. The cancer had spread to her bones and lungs, and she was struggling with complications from the disease.

Then, at a global conference on cancer thousands of miles away in Hong Kong last month, Bagudu saw her again. Gloria was walking with a stick because of the cancer in her hips, but she was attending sessions, speaking about her experience and advocating for other patients.