Gabriele Grunewald said she is facing a recurrence of cancer .
Gabriele Grunewald is a 5,000 - meter and 1500 - meter runner who raced in both events at the U.S. Olympic Trials in July .
Gabriele Grunewald , a 5,000 - meter and 1500 - meter runner who raced in both events at the U.S. Olympic Trials in July , said she is facing a recurrence of cancer .