Thousands of women have taken part in Race For Life at Cannon Hill park in Birmingham and Stoneleigh park in Coventry today.
Before the race in Birmingham, participants enjoyed a Zumba style warm-up before hearing an inspirational speech from 21-year-old Ulrika Dandekar, known as Riya, from Solihull.
Riya was diagnosed earlier this year with a rare blood cancer and urgently needs a stem cell transplant.
The former restaurant team leader used a wheelchair for the race joined by her family and friends.
Karmen Freimuch, Riya's friend urged people to join the bone marrow register and said:
Another group doing the 5 km course for Cancer Research in Birmingham were friends and colleagues of Jessica Evans from Oldbury who died of cervical cancer aged 22.
Jessica's mother Marie Evans joined 'Team Jess' at the finish line and said her daughter would have been very proud of her friends.