When Krysty Sullivan had a routine mammogram in 2019, she was given the all-clear.

Eleven months later, she felt a lump.

Doctors discovered two tumours, each more than 2cm in size. Sullivan, then 48 years old, was diagnosed with triple-negative breast cancer, a type that can be challenging to treat as the cancer cells do not respond to typical targeted treatments.

“It’s always a shock to hear that you have breast cancer, but to learn that I had it months after I had a clear mammogram … it was like the earth shifted,” Sullivan said. “I was left wondering what I had missed.”

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Sullivan was not told after her mammogram screening that she has the highest category of breast density ( known as Bi-rads D ), meaning she has very little fatty tissue. This signif

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