📊 NHS & WHO sourced

Breast Cancer Stages and Grades

How doctors describe how far breast cancer has spread (stage 0–IV) and how aggressive it is (grade 1–3) — and what those numbers mean for treatment and outlook.

Reviewed against NHS & WHO guidelines Last reviewed: January 2025 For educational purposes — not medical advice
✓ Five-year survival at Stage 1 is over 90% in the UK
✓ Five-year survival at Stage 4 is around 26–30%
✓ In low-income countries, most women are diagnosed at Stage III or IV
✓ Grade describes cell abnormality and growth speed; stage describes spread

The staging system (Stage 0–IV)

Staging describes the size of the tumour and how far the cancer has spread. Most oncologists use the TNM system: Tumour size (T), lymph Node involvement (N) and Metastasis (M).

  • Stage 0: DCIS — abnormal cells in the milk ducts but no invasion into surrounding tissue. Not technically cancer but may become invasive.
  • Stage I: Small tumour (up to 2cm), confined to the breast, no lymph node involvement. Five-year survival: >90%.
  • Stage II: Larger tumour (2–5cm) and/or cancer has spread to nearby lymph nodes. Five-year survival: ~80–90%.
  • Stage III: Locally advanced — larger tumour, significant lymph node involvement or cancer has spread to chest wall or skin. Five-year survival: ~50–70%.
  • Stage IV (Secondary/Metastatic): Cancer has spread to distant organs (bones, liver, lungs, brain). Not curable but treatable. Five-year survival: ~26–30%.

What the grade means

Grade describes how abnormal the cancer cells look under a microscope compared with normal breast cells, and how quickly they are likely to grow.

  • Grade 1 (low grade): Cells look most like normal cells; grow slowly. Good prognosis.
  • Grade 2 (intermediate grade): Cells look somewhat abnormal; grow at a moderate rate.
  • Grade 3 (high grade): Cells look very different from normal; grow quickly. May need more aggressive treatment.

Why staging and grading matter

Together, staging and grading guide the treatment plan. A small, grade 1, node-negative tumour may need surgery and radiotherapy only. A larger, grade 3, node-positive tumour is likely to need chemotherapy as well. Understanding your stage and grade helps you have informed conversations with your oncology team.

The global staging gap

In the UK, because of NHS screening, many breast cancers are found at Stage 1 or 2. In low-income countries where Breast Cancer Awareness works, most women are diagnosed at Stage 3 or 4 — which is why we focus on funding screening and awareness to shift diagnosis to an earlier, more treatable point.

Frequently asked questions

What do the breast cancer stages mean? +
Stage describes how far the cancer has spread. Stage 0 (DCIS) means abnormal cells are in the ducts but not invasive. Stage 1 is a small tumour with no lymph node spread (98% five-year survival). Stage 2 is a larger tumour or limited lymph node involvement. Stage 3 is locally advanced. Stage 4 means the cancer has spread to distant organs (26% five-year survival).
What is stage 2 breast cancer? +
Stage 2 breast cancer means the tumour is larger (typically 2–5 cm) or cancer has spread to a small number of nearby lymph nodes, but has not reached distant organs. Stage 2A involves a smaller tumour with limited node involvement; Stage 2B a larger tumour or greater node involvement. The five-year survival rate for Stage 2 breast cancer in the UK is approximately 90%.
Is stage 3 breast cancer curable? +
Stage 3 breast cancer is locally advanced — large, or spread to multiple lymph nodes or nearby tissue — but not to distant organs. With modern treatment (surgery, chemotherapy, radiotherapy, and hormone or targeted therapy), long-term remission is achievable for many patients. The five-year survival rate for Stage 3 breast cancer in the UK is approximately 75–85%, according to NHS and ONS data.
What is grade 3 breast cancer? +
Grade 3 (high-grade) means the cancer cells look very different from normal cells and are likely to grow quickly. Grade describes how abnormal the cells appear under a microscope; stage describes how far cancer has spread. A Grade 3 cancer can be at any stage — a Stage 1 Grade 3 tumour is small but fast-growing, which typically means more aggressive treatment including chemotherapy, even when caught early.
What is the difference between stage and grade in breast cancer? +
Stage describes how far the cancer has spread through the body (from Stage 0 to Stage 4). Grade describes how abnormal the cancer cells look under a microscope and how quickly they are likely to grow (Grade 1 = slow-growing, Grade 3 = fast-growing). Both stage and grade are used together to plan treatment.
Can early-stage breast cancer spread? +
Early-stage breast cancer (Stage 1–2) has not spread to distant organs. However, cancer cells can travel through the lymphatic system or bloodstream, which is why treatment often includes systemic therapies (chemotherapy, hormone therapy) alongside surgery — to reduce the risk of the cancer coming back or spreading.

Clinical sources

  • NHS — www.nhs.uk
  • World Health Organization — www.who.int

This content is for educational purposes and does not constitute medical advice. Always consult a qualified healthcare professional for personal medical guidance.

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