Patients in parts of west London are much more likely to beat cancer than in other parts of England.
According to health statistics from 2013, NHS Harrow saw nearly three quarters of the people diagnosed survive a year, significantly above the England rate of 70%.
Rates for 1-year survival differ for breast, colorectal, and lung cancer, with the borough also having one of the best survival rates for colorectal cancer, at 85%.
Tina Arthur of Marie Curie Embankment said it is positive news for the area, even though there is still a long way to go.
"It is brilliant that west London patients can beat it, especially when there have been many criticisms of the care received in a city where resources are stretched" she said.
"It could be down to a lot of factors, such as where specialist clinics are based, but this is something which can be looked into.
"Obviously something right is being done in west London for survival rates to be higher than the rest of the country and it's crucial we look into those reasons."
However, on the other side of the spectrum, national statistics showed Hillingdon to be have one of the worst 1-year-survival rates for lung cancer.
Across England, the 1-year cancer survival index for England increased steadily from 60.1% for patients diagnosed in 1998 to 70.2% in 2013.
The inequality in cancer survival between the highest and lowest Clinical Commissioning Groups (CCGs) in England has shrunk since 1998, although more diagnosis have been made than ever before.
Between 1998 and 2013, data has shown that that 1-year survival is generally lower in the north of England than in the south.