Pottstown, Pennsylvania — Illeana Casiano-Vazquez and her husband Sam cherish every minute together. Six years ago, she was diagnosed with triple-negative breast cancer , an aggressive form of the cancer that has fewer treatment options and a higher rate of recurrence.

"The first thing I thought about were my boys," Casiano-Vasquez told CBS News. "So, in the same feeling of, 'Oh my God, am I going to die?' sort of was this immediate like, 'I'm not going to die.'"

Chemotherapy and a double mastectomy eliminated signs of cancer. But naturally, she is still worried.

"The mental struggle that comes with the fear of recurrence is real and strong," Casiano-Vazquez said.

Dr. Angela DeMichele, Casiano-Vazquez's oncologist and a professor at the University of Pennsylvania School of Medicin

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