Cancer patients in Waltham Forest are losing out in a postcode lottery, with a low number surviving for more than a year after diagnosis.
A survey by Macmillan Cancer Support shows 36 per cent of patients die within the period, compared to and of 24 per cent in the best performing areas.
The borough was ranked third worst in the country, but there are six areas with a 38 per cent rate.
Carol Fenton, general manager for Macmillan Cancer Support in London and the south-east, said: "This analysis shows an unacceptable postcode lottery.
"Your chances of surviving cancer should not be affected simply because you live in Waltham Forest.
"In Waltham Forest 36% of people diagnosed with cancer die within a year of diagnosis. This is worse than the national average and we must do better.
"When patients have to wait longer for diagnosis and treatment their chances of surviving cancer are significantly reduced."
Ms Fenton is calling on local health commissioners and political parties to work with GPs to provide support, advice and guidance and improve early detection and diagnosis of cancer.