What is the definition of Earned Blood Cells?

Earned blood cells, my friends, are like the hard-earned, superhero-grade oxygen carriers of our bloodstream. They're the unsung champions that have battled infection, fought inflammation, and generally kept us alive in the most grueling of battles. They've seen it all - from the marathon of a marathon runner to the intense workout session of a Fitbit's finest. In essence, they're the blood cells that don your armor for a day and then get replaced by the same army every few months, just like those overworked gym rats.

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Now, here's a sentence that might just unsettle your blood: "The 'earned blood cells' of the cancer survivors were so hard-fought, they convinced the universe they could outlast the rest of us and still be the same old, great-niece of the blood bank."