The double Oscar-nominee hopes to have the play ready to debut next year and is launching a book detailing her battle with the disease, comprising her diary entries and photographs taken by her daughter Annabel Clark, this week.
Journal: A Mother and Daughter's Recovery From Breast Cancer is a candid account of Redgrave's struggle against the killer disease.
And the 62-year-old is determined to keep talking about her cancer battle to inspire fellow sufferers.
She says of the show, "It will be about my life, my experiences, my cancer and my mum (Rachel Kempson)."
And Redgrave's actress sister Vanessa found helping out with the tome hugely rewarding: "The book has brought us closer. You've known this person since she was a baby but you don't know what's on the inside and then it all comes out."
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