The venom of a wasp native to Brazil could be used as a weapon to fight cancer, scientists believe.A toxin in the sting kills cancer cells without harming normal cells, lab studies suggest. The University of Brazil team say the experimental therapy latches to tumour cells and makes them leak vital molecules.

The work is at an early stage and more studies are needed to check the method will work safely in humans.

Polybia paulista is an aggressive social wasp endemic in south-east Brazil.

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