Conditions
Stage 1 breast cancer
Quick answer
Stage 1 breast cancer is a small invasive tumour, up to 2 cm, with either no lymph node spread or only tiny clusters of cells in the nodes. Surgery is the main treatment, usually a lumpectomy with sentinel node biopsy. After surgery, radiotherapy, hormone tablets, targeted drugs or chemotherapy may be added depending on the tumour's receptors and genomic risk.
Medically reviewed by The Curaventa Team · Last updated 2026-10-24
What this stage or type means
- Stage 1A: the tumour is 2 cm or smaller and the armpit nodes are clear
- Stage 1B: tiny deposits (micrometastases, 0.2-2 mm) are found in the nodes, with a small or no breast tumour
- Since 2018, staging also uses grade, ER/PR and HER2 status, so a favourable biology can lower the stage group
- No spread to distant organs (M0)
- Most stage 1 cancers are found through screening or a small lump felt during self-examination
Treatment options
Lumpectomy with sentinel node biopsy
The tumour is removed with a margin of healthy tissue, and the first one to three draining nodes are checked. Most women keep their breast.
Whole or partial breast radiotherapy
Given after a lumpectomy to treat any cells left behind. Shorter schedules of one to three weeks are now common.
Hormone therapy
For ER-positive tumours, tablets such as tamoxifen or letrozole are usually taken for at least five years.
Genomic test-guided chemotherapy
For ER-positive, HER2-negative tumours, a recurrence score test can show whether chemotherapy adds benefit or can be safely avoided.
HER2-directed treatment
Even small HER2-positive tumours may receive a lighter chemotherapy combined with trastuzumab for a year.
Tests that confirm it
- Mammogram and breast ultrasound
- Core needle biopsy with ER, PR, HER2 and Ki-67
- Sentinel lymph node biopsy at surgery
- Final surgical pathology for size, grade and margins
- Genomic recurrence score test on the tumour, when relevant
Outlook
Stage 1 breast cancer has an excellent outlook. For invasive breast cancer that has not spread outside the breast (the 'localized' group), the American Cancer Society reports 5-year relative survival of over 99% for women diagnosed in 2015-2021.
Planning treatment in India
- Expect about 10-14 days in India for surgery, wound review and final pathology results
- Send the biopsy report, receptor results and imaging first, so the team can plan surgery before you fly
- Radiotherapy, if needed, starts a few weeks after surgery; ask whether it is better to stay or to have it at home
- Hormone tablets are long-term and can be continued with your local oncologist using a written plan
Questions to ask your specialist
- Is my tumour stage 1A or 1B?
- What are my ER, PR and HER2 results?
- Would a genomic recurrence score test change my plan?
- Can I have shorter-course radiotherapy?
- How long will I take hormone tablets, and what side effects should I watch for?
Related treatments
Other stages and types
- Stage 0 breast cancer (DCIS)
- Stage 2 breast cancer
- Stage 3 breast cancer
- Stage 4 (metastatic) breast cancer
- HER2-positive breast cancer
- Triple-negative breast cancer
- Hormone receptor-positive (ER-positive) breast cancer
- Inflammatory breast cancer
- Invasive lobular breast cancer
Frequently asked questions
Do I need chemotherapy for stage 1 breast cancer?
Many women do not. The decision depends on receptor status, grade and, for some, a genomic test. HER2-positive and triple-negative tumours more often need it.
Is a mastectomy safer than a lumpectomy for stage 1?
For most stage 1 cancers, lumpectomy plus radiotherapy gives similar survival to mastectomy. The choice depends on tumour position, breast size and personal preference.
When will I know the final stage?
The final stage is confirmed only after surgery, when the pathologist measures the tumour and checks the sentinel nodes. This usually takes about a week.
How often will I need check-ups?
Check-ups are usually every few months at first, then less often, with a yearly mammogram. Your oncologist will give a schedule you can follow at home.
Sources
Medically reviewed by The Curaventa Team. Last updated 2026-10-24. General information, not medical advice. Medical editorial board · Editorial policy · How we get prices
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