Cansa staff are raising funds on the GivenGain crowdfunding platform for care and support programmes for cancer patients, caregivers and loved ones.
A number of the Cansa staff are participating in events and will also have a water station at the halfway mark from 5am to 10am.
Cansa head of marketing and communication Lucy Balona will be participating in the marathon as a newbie.
“I’m running my first marathon and the longest distance - 42km - on Sunday. I’m running 42km for 42 cancer survivors; to show my support and solidarity, and so that they know that they’re not alone,” said Balona.