Former Liberal MP Katie Allen has announced her diagnosis with a rare form of cancer, just days after contesting her former seat in the federal election.

In a post to social media, Dr Allen said the diagnosis was of a type of cancer known as cholangiocarcinoma.

"It's a stage 4 diagnosis and has already spread," Dr Allen said.


"I know there are difficult days ahead, but I'm facing this with clarity and determination."

Dr Allen served as the member for the now-abolished seat of Higgins from 2019 to 2022.

She made headlines in 2022 after crossing the floor to side with Labor on amendments to a religious discrimination bill.

In the most recent election, she challenged incumbent Labor MP Carina Garland in the seat of Chisholm, but was unsuccessful in regaining the seat.

Dr Allen said she would use her own decades of medical experience to ground her.

"As a doctor, I've stood besides many patients and their families during moments like this," she said.

"I've seen incredible courage, dignity and strength in those facing adversity — and I'll be drawing on those examples now, as I walk this path myself."


Messages of support flow from colleagues and peers

Following the announcement, Liberal politicians and candidates from both state and federal levels showed their support through social media messages.

Victorian Shadow Attorney-General Michael O'Brien sent his best wishes in a post.


"Katie, I'm so sorry to hear this. You were such an amazing candidate in Chisholm and showed such energy, grace and determination," Mr O'Brien said.

Liberal MP Keith Wolahan, who also contested the 2025 election, expressed his admiration for Dr Allen.

"I am so sorry Katie. You are deeply loved and admired. We are here for you and your family," Mr Wolahan said.