Canadian Blood Services hopes people will roll up their sleeves and donate blood to help kids with cancer.

It's part of a campaign to mark Childhood Cancer Awareness Month in September.

Childhood cancer survivor Stephanie Simmons, and her mother Renee, helped kick off the campaign in London Wednesday.

On average it can take up to five blood donors to help one child undergoing cancer treatment. It requires up to eight donors a week to help a child with leukemia.

"...The chemo that they do affects their blood count and depending on what it is - like if it's their whole blood - they might be tired, headachy, just lethargic and not feeling well. And you come to the hospital, get their blood checked and the doctor can order either platlets or whole blood and the change is almost immediate," Renee Simmons says.