‘I Didn’t Know There Was A Stage 0’: Tina Knowles' Cancer Diagnosis Is a Wake-Up Call For Mammograms

The earlier a cancer is spotted, the higher the chance of successful treatment, the World Health Organisation says. 

That’s partly why doctors have invented systems, like the TNM (tumour, node, and metastasis) staging system and the number staging system, to communicate how far a cancer has progressed. 

Many of us are familiar with terms like “stage one” cancer. 

But Cancer Research UK says that there’s also “Carcinoma in situ [which] is sometimes called stage 0 cancer or ‘in situ neoplasm.’” 

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