Mary E. Costello

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Mary E. Costello (a.k.a. “Cos”) was diagnosed with de novo metastatic breast cancer (MBC) in July of 2020. For the first four months, she mistakenly believed she had two years to live. Only after a second opinion did she discover that chemotherapy should have never been her first line of treatment—and that was just for starters. Quickly she learned to question EVERYTHING. Read more.