How did a dangerous and useless childhood cancer drug flood the world? And what does it mean for the estimated 70,000 children around the world who remain at risk?

Join our free livestream with TBIJ reporters Rosa Furneaux and Laura Margottini, chaired by global health editor Chrissie Giles. They will delve into how they reported on the story, as well as answer your questions about the investigation. 

In 2017, Brazilian doctors began using a new brand of a crucial chemotherapy drug called asparaginase. Before long, they started to notice a terrifying trend...

Children who were taking the new brand, which had been bought cheaply by the government, had a lower survival rate than those taking a brand made by a different company. Researchers discovered the medicine was practically useless and contaminated. It was quickly banned in Brazil — but the problem didn't stop there.

The investigation reveals how poor-quality asparaginase is being used in hospitals across the world, putting tens of thousands of children at risk.

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Live: How bad childhood cancer drugs flooded the world