NEW YORK -- Robin Roberts, co-anchor of "Good Morning America," will begin chemotherapy treatment for her breast cancer Thursday.

Roberts repeated during the morning news show Wednesday morning that she is extremely grateful that doctors found her cancer early. She maintained that her prognosis is very good.

She said she will work as much as she can, but wanted viewers to know that if they tune in from 7 to 9 a.m. weekdays and notice she is losing her hair, don't be alarmed.

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