Thousands of women have taken part in Race For Life at Cannon Hill park in Birmingham and Stoneleigh park in Coventry today.
A young boy who has leukaemia needs a stem cell transplant as he has a slim chance of survival.
Teenagers will today make history as they become the youngest people in the world to sign up to become bone marrow donors.
An appeal to find matching bone marrow for a woman from Solihull who is fighting blood cancer has led to a ten-fold increase in Asian donors in the Birmingham area - but she still needs to find a match.
Riya Dandekar, who is 21, has a rare form of blood cancer called Anaplastic Lymphoma, and has been told her best chance of survival is a bone marrow transplant.
But the Anthony Nolan charity, which runs the bone marrow register, says Asian people are underrepresented on it, and despite the surge in donors, Riya still doesn't have a match.
Visit the Anthony Nolan website for information on how to sign up to the register.
Father of two-year-old Gaurav Bains who was diagnosed with a rare blood disorder in June 2013 is running the London Marathon to raise money for charity.
Sunny Bains is running the 26.2 miles on Sunday 13th April for Anthony Nolan after son Gaurav found a bone marrow match after a national campaign.
Sunny and Gaurav's mum Gurprit started 'Gaurav's Bone Marrow Appeal' through social media to raise awareness among Asian communities about Bone Marrow donors which resulted in a 1,700% increase of donors from the Asian community.
Gaurav had his transplant in December 2013 and was discharged from hospital on 28th February after months in isolation.
Read more here.
Almost every 15 to 20 minutes, someone in the UK is diagnosed with blood cancer
That's exactly what happened to Rik Basra. But his life was transformed after a bone marrow transplant.
Today, he encouraged university students to take a few simple steps, which he says, could save a life.
Former Leicester City player, Gary Lineker is in Leicester today backing an event to increase the number of bone marrow donors. It is in support of the Anthony Nolan charity. It is hosting a registration day at De Montfort University in Leicester.
"A bone marrow transplant can be the last chance of survival for someone with blood cancer, but it's only when you're faced with it personally and you see the shortage of bone marrow donors available that you realise just how important it is for people to sign up."
The event is happening until 4pm today. Those who cannot attend can sign up on the Anthony Nolan website.