Siobhán Post and her husband were thrilled to learn she was pregnant with twin boys. Five months later, the 35-year-old non–smoker was diagnosed with lung cancer.

Over the next few years, Siobhán's resilience and strength is tested again and again – from a lung cancer diagnosis, to finding a brain metastasis, and being deemed a palliative care patient with only months to live.

Click here to read Siobhán's story.

World Cancer Day is February 4. This year, Princess Margaret will celebrate World Cancer Day by sharing stories of courage.

Tune-in this week to Cancer Mythbusters – a video series asking people in the streets of Toronto to debunk common cancer myths! Today, we're busting myths about breast cancer.

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