Simon Morgan-Jones said: "This was a great opportunity to promote the fantastic work of CLIC Sargent to the six million people who watch BBC Breakfast. It was an honour to be able to represent the charity."
Viewers also had the chance to put their own questions to Simon on the topic, and ask for hints and tips, during a Facebook Live session. Watch it again on the BBC Breakfast Facebook page.
Information and help for families
CLIC Sargent has a number of resources that have been developed for children facing or in treatment, such as storybooks that explain cancer and treatment in simple terms, as well as information for teachers, and support for parents.
Visit our Info and Support section for more information about how the CLIC Sargent team supports young lives against cancer.