OncologyDr. Jalaj BaxiBreast Cancer

Senior Consultant, Surgical Oncology, Fortis Hospital, Noida

Part 8 of 9 in Diagnosis and Management of Breast Cancer

Radiation Therapy After Breast Cancer Surgery: When It's Needed

November 17, 2024

Radiation therapy in breast cancer is almost always adjuvant, given after surgery, and its indications differ depending on whether the breast was conserved or removed.

After breast conservation, radiation is close to universal

Every patient who undergoes breast conservation surgery needs post-operative radiotherapy, with an additional boost dose delivered specifically to the lumpectomy site where the tumor was removed.

After mastectomy, radiation is selective

Following mastectomy, radiation is reserved for larger tumors, node-positive disease, or positive margins after resection; any one of these three findings is enough to trigger post-operative radiotherapy. In the axilla specifically, radiation is added when there is extensive extracapsular extension in node-positive disease, when a positive sentinel node is found but axillary dissection is not performed, or when dissection was inadequate in a high-risk patient.

This article is based on a Jivo Masterclass session conducted by Dr. Jalaj Baxi, Senior Consultant, Surgical Oncology, Fortis Hospital, Noida. The article has been summarised with the assistance of an AI tool from the original masterclass recording. Watch the full Masterclass recording

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This guide is based on a live Jivo Masterclass: Dr. Jalaj Baxi taught doctors across Africa on November 17, 2024.

FROM THE LIVE Q&A

MO

Moderator

Can chemotherapy be combined with hormonal therapy, and what other management plans and success rates apply in metastatic disease?

JB

Dr. Jalaj Baxi

Yes, combining chemotherapy with hormonal therapy is possible. Further management depends on how the patient responds to treatment. Roughly 30 to 35% of metastatic breast cancer patients respond well, and where the response is strong enough, it can become possible to address the metastatic sites and the primary tumor surgically as well.

See all 10 questions from this masterclass →

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Frequently Asked Questions

If a patient remains symptomatic after eight cycles of chemotherapy, what other treatment options are available?

Immunotherapy can be added, and second-line or third-line chemotherapy regimens are available, including CDK4/6 inhibitors. Next-generation sequencing of the tumor helps identify which newer targeted drugs are likely to be effective for that specific patient.

Why do many patients' health seem to deteriorate immediately after a breast cancer diagnosis?

This is largely psychological rather than driven by the disease itself, a kind of cancer phobia that sets in once the diagnosis is given, where the patient loses a sense of control over their own life and fears dying early or being treated inadequately. Educating patients about their specific disease and realistic treatment outcomes helps restore the sense that there is still a fight to be had, which improves how they cope.

In what situations is prophylactic mastectomy appropriate in early-stage breast cancer?

Only in patients with a genetically determined risk, specifically those who test positive for BRCA1 or BRCA2 mutations. BRCA testing itself is only done when there is a family history of breast cancer.

What modalities help prevent reactions to anti-cancer drugs and reduce mortality during chemotherapy?

Mortality in chemotherapy is a fairly rare event, and when it happens it is almost always due to bone marrow suppression. The key is giving chemotherapy under close supervision so that this suppression is caught early, since early detection is what actually prevents mortality.

How does surgery compare with radiotherapy for local control in advanced-stage breast cancer?

Radiotherapy is used only when surgery is not possible. If chemotherapy shrinks the tumor enough that surgery becomes feasible, surgery should be done. Radiotherapy has very few indications in advanced disease, so a direct comparison between the two is not really meaningful in this setting.

Does every patient who has breast conservation surgery need radiation afterward?

Yes. Post-operative radiotherapy is required for essentially all patients who undergo breast conservation, with an additional boost dose delivered to the lumpectomy site.

When is radiation given after a mastectomy?

When the tumor was larger, when lymph nodes were positive, or when the surgical margins came back positive. Any one of these three findings is sufficient to indicate post-operative radiotherapy.

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