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I¡¯ve been a regular blood donor since 1981. But it wasn¡¯t until my wife, Kelly, was diagnosed with stage IV anal cancer in 2014 that blood donation became personal.

As a cancer caregiver, you learn that ¡°you¡± becomes ¡°we.¡± Following Kelly¡¯s diagnosis, I set everything in my life aside. I became an expert in her type of cancer and the treatments and procedures.

After she completed chemotherapy and radiation therapy near our...