The 37-year-old, who has stage 4 bowel cancer, said on the show: "I can't run away and hide, I just have to get on with my life."
By vowing to live her life to the full, Deborah is honouring the legacy of her best pal Rachael Bland, who died last month, two years after being diagnosed with breast cancer.
Deborah, who co-hosted the award-winning podcast You, Me And The Big C with Rachael, said she still misses her friend every day.
"I miss her so much, even looking at those photos of her, it breaks my heart," she told Lorraine.
"But what we did together… we put cancer on prime time.
"I'm so proud to have done that with her and her legacy and what we started, we're carrying on with it."
It's a message Deborah gets across in her new book, F*** You Cancer, which goes on sale tomorrow – pre-order here now.
Lorraine praised The Sun columnist for her "funny and honest" take on cancer, telling Deborah, "I've learned so much from reading it".
The book aims to be a self-help guide for anyone facing cancer, offering practical tips to get you through the best and worst days.
"I wrote the book because I wanted to do something for you or your friend when they're diagnosed with cancer," Deborah said.
"I wanted to share the inner secrets of what it's really like, to tell people it's OK not to be OK.
"To say, do whatever feels right for you.
You have to laugh or you’ll cry. You have to make the most of the hand you’ve been dealt
"If you want a glass of wine, have a glass of wine. Wear heels and lipstick, and live with cancer.
"I wanted to show people you can do that."
In latest her Sun column, Things Cancer Made Me Say, Deborah revealed she never thought she would live to see the day her book was published, having written it while going through her "darkest days" of treatment.
The mum-of-two was diagnosed with bowel cancer the week before Christmas in 2016.
She's since undergone one operation to remove a 6.5cm tumour in her bowels, four lung operations and 21 rounds of "nuclear" chemo.
Last week she finished a series of cutting-edge Cyber Knife radiotherapy treatments, to try and blast an inoperable tumour that's wrapped around an artery near her liver.
Deborah has shared her experiences, sharing her highs and lows in her column, always in a bid to raise awareness of bowel cancer.
Caught early bowel cancer can be cured. Diagnosed at stage 1, patients have a 97 per cent chance of living for five years or longer.
But, if you're diagnosed at stage 4, like Deborah was, that chance plummets to just seven per cent.
Not knowing what the future holds, Deborah said she is focusing on living for now, and making memories with her family, husband Seb, 38, and their two kids, Hugo, 11, and Eloise, eight.
She told Lorraine: "It really annoys me, the idea that you have to fight your cancer.
"Rachael was the prime example of this, she was positive, healthy and upbeat – yet she died of cancer.
"I'm undergoing all this treatment but I'm living with cancer.
"I have no choice. I just get on with it."
But, the ex-deputy head teacher, added cancer is a "very personal thing," and what works for one person might not work for others.
"I just advocate doing what's right for you," she said.
"One person might want to get up and fight their cancer, and might just want to run away and cry.
"And you know what if you're going to have a bad day, have a bad day and wipe your tears.
"And as Rachael said you wipe your tears and get on with it, what else can you do.
"You have to laugh or you'll cry.
"You have to make the most of the hand you've been dealt and you hope that by doing so you can help other people.
"Writing this book has helped me, and I hope it can help others."
Last week, The Sun ran a series of exclusive extracts from Deborah's book.
She revealed when strangers tell her they can't believe she has stage 4 cancer, it's like a drug.
And we shared her kids' take on her cancer, in their own words. The pair said they felt angry and scared at discovering their mummy had cancer, and asked the heartbreaking question, "What happens if the medicine doesn't work"?
One of the biggest lessons, Deborah said she's learned from having cancer, is that it's made her a better mum.
She said life "before cancer" went at a million miles an hour, meaning she was never truly "present in the moment" with her kids.
F*** You Cancer by Deborah James, published by Vermillion on October 4, 2018 at £9.99 and available at Amazon.
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