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The London Marathon chief executive says his organisation is doing "more than anyone else" to ensure athletes are not doping.
Nick Bitel was speaking to ITV News about allegations made by the Sunday Times about drug test data from 2001 to 2012.
We're at the forefront of the battle against doping in our sport, the first people to call for blood tests and the only ones to blood test every single elite athlete.
We've done our part. What this shows is that others need to do more. This has to be a concerted effort but we're not the disciplining authorities.
What people need to know is that when an athlete comes to the London Marathon we are doing more than anybody else to make sure that athlete is clean and we will continue to do so and if there's more to be done then we will do more.
London Marathon chief executive Nick Bitel has said race organisers are "very concerned" by allegations in the Sunday Times that seven winners in a 12-year period recorded suspicious blood scores.
The newspaper has published fresh allegations following its analysis of drugs test data from 2001 to 2012.
It said the winners of 34 major marathons around the world - one in four - during the period should have faced censure or investigation because of their test results, with those athletes collecting more than £3million in prize money.
We believe there are people in our sport who are cheating and everyone has a part to play to protect those who are not.
We continue to be at the forefront of anti-doping measures for marathon runners as we are determined to make marathon running a safe haven from doping but we cannot do it all on our own and rely heavily on the IAAF.
We are therefore very concerned by the allegations made in the Sunday Times today and we will be discussing the implications of the allegations with the IAAF.
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