It Started With A Routine Letter In The Mail. Now, She Is Fighting An Aggressive “Freeloader”—And Her Urgent Warning Will Give You Chills.

Karl Stefanovic’s ex Cassandra Thorburn issues sad update on cancer treatment


Cassandra Thorburn has issued a candid update on her cancer treatment after being diagnosed with a very rare and aggressive form of breast cancer.

The ex-wife of Karl Stefanovic publicly shared that she had been diagnosed with breast cancer on February 25, and she has now revealed she is halfway through her first 12-week treatment cycle.

“Feeling the best I have all week the day before treatment, only to turn up for another dose, is a big part of the battle for me currently,” she shared in an Instagram post.

“I have less anxiety around loss of control and am more focused on managing the side effects.”

Cassandra Thorburn
Cassandra Thorburn has issued an update on her cancer treatment. (Credit: Instagram)

“For those who messaged me wanting free complementary therapies to use alongside chemotherapy, workshops and virtual classes are offered on the Cancer Council Look Good Feel Better website: lgfb.org.au.”

Her daughter, Willow, 20, whom she shares with Karl, has flown back to Australia to be with Cassandra amid her health difficulties.

According to our sister publication Woman’s Day, Willow, who studies fashion journalism in London, had originally planned to celebrate her 21st birthday by travelling around the UK with her mother.

Amid Cassandra’s health difficulties, she instead returned Down Under to be by her mother’s side.

“With the help of both Karl and Cass, Willow made the decision that instead she would fly home and spend quality time with her mum,” an insider told the publication.

Cassandra’s children, Willow, Jackson, 26, and River, 19, are all said to have rallied around her following her diagnosis.

Cassandra Thorburn
Cass is being supported by her children (pictured with River and Willow). (Credit: Instagram)

What cancer was Cassandra Thorburn diagnosed with?

Cassandra first hinted at her health news when she shared a photo on Instagram on Tuesday, February 24.

The photograph showed her with newly shorn locks, while she wrote in a caption, “Life really is like a box of chocolates. And this chapter is giving my praline or truffle vibes.”

She didn’t elaborate further, but gave “kudos” to the Toni & Guy hair salon in Mosman, NSW, for their “pink scissors program” and their “kick arse clipper treatment”, adding that her hair will “grow back”.

Cass’s post was flooded with comments from concerned followers, some of whom seemed to notice a type of medical port peeking out of the top of Cass’s singlet.

The following day, Cassandra shared another Instagram post, in which she confirmed that she had recently been diagnosed with breast cancer.

Cassandra Thorburn
Cassandra first announced her diagnosis in February. (Credit: Instagram)

“On my walk this morning I thought of all the reasons why I made that post yesterday,” she said as she sat in her garden.

“Most of it is controlling the only part of my treatment and diagnosis that I can. That’s the part about when the hair comes off and when you tell people.”

Cassandra added that for herself and the three adult children she shares with her ex Karl, she is not interested “in hiding” because “I am not alone”.

“I am not walking a path that is not well travelled by many women before me, and I will not be the last,” she said. “Breast cancer affects one in seven women in New South Wales, which is where I live.

“I read that sitting waiting for my mammogram not long ago – and I was the one in seven that day.

Cassandra Thorburn
Cassandra shared photos of herself before and after cutting her hair following her breast cancer diagnosis. (Credit: Instagram)

“My shout out today is the New South Wales Breast Screen, which picked up my triple-negative occult breast cancer, which is no small feat if you know what occult breast cancer is. I didn’t – until now.”

“I thank them from the bottom of my heart.”

According to ScienceDirect.com, the type of cancer that Cassandra has is very rare and aggressive.

Triple negative occult breast cancer is a scenario where axillary lymph node metastasis is present, but no primary tumor is detectable in the breast via imaging or clinical exam.

It lacks ER, PR, and HER2 receptors, requiring treatment with systemic chemotherapy and immunotherapy.

What is the Pink Scissors Program?

In her post, Cassandra gave thanks to Toni & Guy’s Pink Scissors Program.

The community initiative is designed to support individuals undergoing cancer treatment who are experiencing hair loss.

The program offers complimentary, personalised salon services delivered by specially trained stylists who understand both the practical and emotional impact of treatment-related hair changes.

Clients receive guidance before, during, and after hair loss in a private and compassionate setting, helping them feel more prepared and supported throughout the process.

Karl Stefanovic Cassandra Thorburn
Karl and Cassandra were married for 21 years. They split in 2016. (Credit: Getty)

Cassandra finished her statement by urging women everywhere not to wait around when it comes to getting a mammogram.

“When your mammogram reminder arrives in the mail, don’t dilly dally. Do as I did – book it straight away,” Cassandra said.

“It may have flipped my world in days, but there’s no ‘why me’. There’s no poor me here. Just a desire to stop this in its tracks. I don’t need this freeloader. Have a great day.”