Children surviving cancer who mark their last day of chemotherapy by ringing a bell at St. Louis Children's Hospital, can also now ring a giant bell on a billboard over Interstate 44.

The 12-foot-tall metal bell was installed Wednesday on the billboard near Big Bend Boulevard.

When a child completes cancer treatment at St. Louis Children's, staff will use an app on their phone to trigger the bell, which will have speakers so passersby can hear it ring.

About five to 10 children a month complete their chemotherapy and celebrate with the bell-ringing.

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