Less than three-fifths of women in Kensington and Chelsea are being screened for breast cancer, one of the worst rates in England.
Just 57.4% of eligible women in the area were up to date with screening at the end March 2016, according to NHS data.
However, this did represent a small increase from 57.3% in 2015.
Neighbouring Hammersmith and Fulham saw one of the biggest improvements in England, with 62.8% screened in 2016, up from 61.1% in 2015, but still had some of the worst coverage rates in the country, as did Westminster (60%) and Brent (65.8%).
In Harrow, the borough saw one of the biggest drops in the country from 74.4% to 72.9%, although this was still the best coverage rate in west London.
Coverage is defined as the percentage of women in the population who are eligible for screening at a particular point in time, who have had a test with a recorded result within the last three years.
Women between the ages of 50 and 70 are invited for regular breast screening every three years under a national programme.
Across the country coverage of women aged 53-70 was 75.5% in March 2016, compared with 75.4% at the same point in 2015 - representing a first increase in five years, but still some distance from a peak of 77.2% in 2011.
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