Watch below: Samantha Womack on her breast cancer journey: 'I feel fantastic'
Womack said: "I'd been with Olivia, just for a dinner after a show I'd done, I'd played Sandy in Grease. It was just at the beginning of her diagnosis and what struck me was her journey had been 30 years and she was at the end and I was just at the beginning, and it took me back - I felt very moved by it."
She added: "I thought, 'I want to share it. I want to talk to people. I want to put it out there' and it was amazing, the love that came back. I felt empowered by it."
Womack made her diagnosis public when posting a picture of Newton-John after the Grease star's death in August.
She also revealed that she had undergone a lumpectomy to have the cancerous tissue and five lymph nodes removed.
Womack also recently began chemotherapy and shared that she had suffered from side effects including headaches and loss of appetite.
She recently returned to work in a production of The Lion, the Witch and the Wardrobe at the Gillian Lyne Theatre in London.
Womack is playing the evil White Witch in the latest adaptation of CS Lewis' classic children's novel.
Some of her other theatre productions include the UK tour of The Girl on the Train, Morticia in The Addams Family and several pantomimes.
Outside of EastEnders, Womack is best known for her roles in Kingsman: The Secret Service, Liverpool 1 and Mount Pleasant.