The daytime talk show "The Doctors" said Harper will appear Monday to talk with Travis Stork, Lisa Masterson, Andrew Ordon and her team of doctors.
The 1970s sitcom star has been diagnosed with a rare brain cancer and told she has as little as three months to live. She says her husband briefly withheld the diagnosis from her because it was so dire.
The now-73-year-old Harper played Rhoda Morgenstern on "The Mary Tyler Moore Show" and its spinoff, "Rhoda."
She's given the full hour of Monday's talk show and is surprised by former co-stars Ed Asner and Cloris Leachman.
NBC says Harper will also be interviewed by Savannah Guthrie on the "Today" show Monday.
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