Breast Cancer Recurrence Risk - 5-Year Local Recurrence Score

A breast cancer recurrence risk calculator turns three reproducible pathology findings (histological grade, lymph node status, and lymphatic or vascular invasion) into an estimated probability that the cancer will return in the chest wall or mastectomy skin flaps within five years. This calculator implements the local recurrence index published by O'Rourke and colleagues in 1994 from 966 patients treated with simple mastectomy and node biopsy without postoperative radiation or systemic adjuvant therapy. It is a planning aid for a frank conversation, not a substitute for a multidisciplinary tumour board decision or for the genomic assays (Oncotype DX, MammaPrint) that estimate distant recurrence risk.

• • After a new diagnosis: A patient who has the three O'Rourke inputs on a pathology report and wants a single 5-year local recurrence percent.
• • Before a multidisciplinary meeting: A clinician who wants a quick lookup of the published 5-year local recurrence rate for a grade, node, and LVI combination to anchor a chest wall radiation discussion.

The O'Rourke study followed 966 women for a median of 7 years, reported an overall local recurrence rate of 23 percent (223 of 966), and placed the highest-risk combination at 39 percent by 5 years. The index remains one of the simplest local recurrence models in the literature and is still cited in modern multidisciplinary guidelines.

Recurrence risk is the other side of the breast cancer recurrence risk story from a Gail-style risk summary, so Breast Cancer Risk Calculator is the natural companion for someone who wants both a baseline 5-year invasive probability and a 5-year local recurrence percent in the same workflow.

The calculator reads the tumour grade, the lymph node status, and the LVI status, looks up the published 5-year local recurrence rate for that combination in the O'Rourke 1994 table, and labels the result as low, moderate, high, or very high. The result is a direct lookup from the published table, not a regression estimate, which is why each combination has a single whole-percent answer.

• Tumour grade: Nottingham histological grade (1, 2, or 3). Higher grade means more aggressive cell appearance under the microscope.
• Lymph node status: Whether cancer cells are present in the axillary lymph nodes. Node negative is the lower-risk group; node positive is the higher-risk group.
• Lymphovascular invasion (LVI): Whether tumour cells are seen inside small lymphatic or blood vessels. Present is the higher-risk group.

The O'Rourke index is a simple lookup, which is what makes it easy to apply in a clinic visit. Modern guidelines cite it as one of the inputs to a post-mastectomy radiation decision alongside tumour size, margin status, and the number of positive nodes.

According to O'Rourke et al. Br J Surg 1994, local recurrence after simple mastectomy showed significant associations with tumour grade, nodal status, and the presence of lymphovascular invasion in a retrospective cohort of 966 patients with a median 7-year follow-up, and a predictive index combining those three variables placed the highest-risk group at a 39 percent chance of developing local recurrence by 5 years.

Other solid tumour recurrence scores use the same compact-table approach (a small number of pathology features, a single banded risk percent), and EORTC Bladder Cancer Calculator shows how the Sylvester 2006 table reads for non-muscle invasive bladder cancer after the index TURBT.

Three pathology features drive the O'Rourke number, and a fourth clinical feature (the number of positive lymph nodes) drives the radiation conversation that usually follows.

The O'Rourke 1994 cohort was a surgical series treated without adjuvant radiation or systemic therapy, so the calculator's 5-year local recurrence rates are higher than modern series that include chemotherapy, endocrine therapy, and post-mastectomy radiation. According to the American Cancer Society, chest wall radiation after mastectomy lowers the risk of cancer coming back in the chest wall or the skin flaps for patients with larger tumours, positive lymph nodes, or other high-risk features.

Active smoking is one of the few modifiable factors the American Cancer Society links to a higher chance of breast cancer coming back, and Smoking Recovery Calculator is a natural next step if the post-treatment visit also needs a dated quit-smoking timeline and a life-years-regained estimate.

The calculator is designed for a clinic visit where the three pathology findings are already on the report. Work through the steps in order and bring the result to your oncology team.

1. 1 Find the grade: Look for the Nottingham grade (also called the Bloom-Richardson grade), usually written as grade 1, grade 2, or grade 3.
2. 2 Confirm the lymph node status: The pathology report should state whether the sampled axillary lymph nodes contained cancer cells. Node positive means at least one node contained cancer.
3. 3 Check whether LVI is mentioned: LVI is a yes-or-no observation, sometimes called lymphovascular invasion, vascular invasion, or angioinvasion. If the report does not mention it, ask the pathologist to confirm.
4. 4 Read the result and the band: The result panel shows the 5-year local recurrence percent, the band (low, moderate, high, or very high), the cohort baseline of 23 percent, and the high-risk ceiling of 39 percent.
5. 5 Bring the result to the meeting: Use the result as one input to the conversation about post-mastectomy radiation, endocrine therapy, or chemotherapy. The number does not replace the multidisciplinary decision.

A 58-year-old woman had a simple mastectomy and node biopsy for a 3.2 cm invasive ductal carcinoma. The pathology shows grade 2, two of twelve positive nodes, and LVI present. Entering grade 2, node positive, and LVI present returns 33 percent local recurrence at 5 years, labelled Very high. The oncology team should weigh post-mastectomy radiation.

Excess adiposity is one of the modifiable factors the American Cancer Society lists for breast cancer recurrence risk, so Body Fat Percentage Calculator is a useful follow-up between visits to anchor that part of the conversation with a number you can re-check over the surveillance period.

A recurrence calculator is a planning aid, not a clinical tool. Used well, it shortens the path from pathology report to treatment conversation and makes it more consistent across visits.

• • Translates three pathology fields into one number: Grade, node status, and LVI are scattered across the pathology report. The calculator gathers them into a single 5-year local recurrence percent.
• • Anchors the radiation discussion in published data: The result is a direct lookup from a 1994 cohort of 966 patients, so the meeting can refer back to the original study.
• • Surfaces a risk band, not a binary answer: The four-band classifier (low, moderate, high, very high) gives the patient and team a shared vocabulary for the radiation trade-off.
• • Pairs naturally with the Gail-style risk calculator: The Gail-style risk summary addresses the chance of getting breast cancer in the first place, while the O'Rourke index addresses the chance of it coming back after treatment.

The calculator is a quick reference, not a personalised prediction. Two patients with the same grade, node, and LVI combination can still have different outcomes because of tumour size, receptor status, treatment received, and genetics.

Modifiable lifestyle factors still matter after treatment, so Alcohol Units Calculator is a useful companion to track weekly alcohol use, which the American Cancer Society flags as a contributor to breast cancer recurrence risk after diagnosis.

Three features drive the O'Rourke number, but several important features are outside the index and should be discussed alongside it.

• • The O'Rourke 1994 cohort did not receive post-mastectomy radiation or systemic adjuvant therapy, so the published rates are higher than those seen in modern cohorts.
• • The index is for local recurrence only. Distant recurrence is a separate endpoint that genomic assays such as Oncotype DX and MammaPrint were designed to estimate.
• • The calculator does not include HER2 status, hormone receptor status, tumour size, margin status, or the exact number of positive nodes, all of which feed into a modern multidisciplinary recurrence discussion.

Use the result as one input to the recurrence conversation, not a definitive prediction. The multidisciplinary team will combine it with the rest of the pathology and imaging information.

According to NCI, post-mastectomy radiation therapy is recommended for patients with positive surgical margins, primary tumours larger than 5 cm, and involvement of four or more axillary lymph nodes, and is often considered for patients with T3 or T4 primary tumours or with one to three positive axillary lymph nodes combined with other high-risk pathological features such as lymphovascular invasion or high tumour grade.

Body weight is a separate, modifiable factor in long-term breast cancer recurrence risk outcomes, so BMI Calculator is a useful companion to put the BMI side of the recurrence discussion on a number rather than a description.