On Sunday, finally running free of the succession of back, hip and calf injuries that have dogged the last five years of his career, he hopes to be able go one better by winning the London Marathon and eclipsing Kimetto's world record.
"CLIC Sargent is an incredible charity and our Guinness World Record attempt will hopefully play a significant part in promoting the brand even further, helping to raise more vital funds for children and young people with cancer".
The 35-year-old said the women's marathon world record of 2 hours 17 minutes and 42 seconds, set by Paula Radcliffe at the 2005 London Marathon, is within her sights as her fellow Kenyans Florence Kiplagat and Vivian Cheruyiot work together with her at this year's race.
Lilesa - who has relatives in prison in Ethiopia - is now living in exile in the United States but will oppose Bekele on Sunday, the first time he has competed in London since 2014. "I'm expecting to run between 2:04 and 2:07".More news: British Parliament Votes In Favour Of Early Election
Tanzania's long-distance prodigy Alphonce Felix Simbu has arrived in London ready for the London Marathon due on Sunday.
Ethiopia's Mare Dibaba won a bronze medal behind Sumgong in Rio last summer and said it was hard to learn the victor might have been taking banned substances.
"It is unique, there's no other race like it".
Cheruiyot was narrowly beaten at the Lisbon Half Marathon last month by world champion Mare Dibaba, who is at the forefront of a strong Ethiopian challenge.More news: Arkansas Sidesteps Legal Wrangling, Executes First in List of Inmates
The charity also has a wide range of running events for all abilities, including half marathons and 10ks for men and women, as well as the women-only Race for Life 5k, 10k and Pretty Muddy events.
The line-up features reigning two-time Chicago Marathon victor Florence Kiplagat (2:19:44 PB), world silver medallist Helah Kiprop (2:21:27 PB) and Olympic 5000m champion Vivian Cheruiyot, who is making her much-awaited debut in a city she refers to as her second home.
"For me it really embarrasses the sport", said Florence Kiplagat about Sumgong's provisional positive which has yet to be confirmed by a test of her "B" sample. Biwott finished runner-up in 2014, fourth in 2015 and second again past year in a personal best time of 2:03:51. "I'm ashamed because we are losing top athletes like that". "I want to win here". "She can't say she didn't know".
Susan Pinkney, head of research at CAF, said: "The London Marathon is one of the world's greatest sporting events and among the biggest and best fundraiser. If she is using something it is very disappointing".More news: Champs Elysees attack: What we know
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