"Bone marrow donors are scarce and particularly for African-American women," she writes. "I am very fortunate to have a sister who is an excellent match, and this greatly improves my chances for a cure. As you know from my recent interview with Mark Zuckerberg, organ donation is vitally important. Many people don't realize they can be bone marrow donors. I encourage everyone to sign up on a donor registry like bethematch.org."
After her promotion, the amount of people signing up as potential bone marrow donors (including yours truly and many employees of ABC News) on Be the Match soared more than 1,800 percent.
Until her return, Roberts says she will head "to the beach for the next week to reflect and give thanks for my many blessings."
Check out a celeb-filled "Welcome Back" video below that was played for Roberts this morning.
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