By Jan Carabeo

PHILADELPHIA (CBS) – The Susan G. Komen 3-Day is now underway in the Delaware Valley.

Hundreds of walkers are making their way 60 miles through communities from Willow Grove to South Philadelphia all in effort to find a cure for cancer.

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Theirs are stories of perseverance and messages of hope.

But for the next three days … words turn into action.

Seven hundred and fifty people will walk 60 miles to raise awareness and money for the fight against breast cancer.

Dr. Sheri Prentiss says, “It’s truly for women and men who want to make a difference to end breast cancer.”

This year, 123 walkers are also survivors.

Like Irene Cassidy.

“I was diagnosed 2012 with DCIS.”

And Donna May.

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“I’ve had three different types of breast cancer.”

May has beat them all.

But she also knows she carries those not as fortunate with her.

“If I can do this for them, it means the world to me because I am them. They are me.”

For 12 years the 3-Day has raised more than $66 million here in Philadelphia.

But this event is just as much about education.

Cassidy says, “No history, I’m under 50, came as a shock routing mammogram. Some of the early detection like myself can make a difference in your life.”

Dr. Sheri Prentiss says, “Many times when we’re out in the route people will say how can I donate and give, and how can I get involved.”

After millions of steps, their journey ends Sunday at the Navy Yard.

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Their mission, however, is never complete until there’s a cure.