You see it all around you: pink ribbons, pink hats, pink T-shirts. You can buy pink bracelets, pink bookmarks and pink watches. When I was diagnosed with stage IV thymoma in 2013, I wondered: what color is my cancer?

Thymoma is a rare cancer of the thymus. Approximately 500 Americans are diagnosed with thymoma each year. It had dropped malignant cells onto my heart and diaphragm, requiring two major surgeries and chemotherapy...