What Sarah Ferguson's Two Diagnoses Can Teach Us About Breast Cancer and Melanoma

Two announcements, seven months apart

In June 2023 the Associated Press reported that Sarah, Duchess of York, then 63, had surgery after being diagnosed with early-stage breast cancer. Her spokesperson said the cancer was found through a routine mammogram, that the surgery went well, and that her prognosis was good.

In January 2024 the AP reported a second diagnosis. She had a malignant melanoma. Her spokesperson said it was found after several moles were removed while she was having reconstructive surgery following a mastectomy, and that doctors were analyzing it to see whether it had been caught early. "Clearly, another diagnosis so soon after treatment for breast cancer has been distressing but the Duchess remains in good spirits," the spokesperson said.

Those two statements are the whole public record used here. The second cancer was not caused by the first. It was found because someone was already looking.

What a mammogram is doing

A mammogram is a low-dose X-ray of the breast. NCI describes it as the main tool for finding breast cancer early, often before it can be felt.

The USPSTF recommends a mammogram every two years for women aged 40 to 74. For women 75 and older it says the evidence is not enough to judge. It says the same about adding ultrasound or MRI for women found to have dense breasts on an otherwise normal mammogram.

"Early-stage," the phrase used in her spokesperson's statement, matters more than any celebrity detail. The American Cancer Society projects 321,910 new US breast cancer cases and 42,140 deaths in 2026, and SEER republishes that projection; SEER's own measurement of five-year relative survival is 91.9% across all stages for 2016 to 2022. That high figure exists largely because most cases are caught early. Our page on mammograms explains what the appointment involves.

Why melanoma is the skin cancer that matters most

Most skin cancers are basal cell or squamous cell carcinomas, and they rarely spread. Melanoma is different. It is far less common and causes most skin cancer deaths.

For melanoma the Society's 2026 projection, again carried by SEER, is 112,000 new US cases and 8,510 deaths. SEER's measured five-year relative survival, based on people diagnosed between 2016 and 2022, is 94.7% overall, but that average hides everything. By stage it is 100.0% while the melanoma is still confined to the skin, 76.0% once it has reached nearby lymph nodes, and 34.0% once it has spread further. Seventy-seven percent are found while still confined. Depth at the moment of diagnosis is close to everything.

The ABCDE rule, and what it misses

NCI's rule for spotting an early melanoma:

• Asymmetry. One half does not match the other.
• Border. Edges are ragged, notched or blurred, and pigment may bleed into nearby skin.
• Color. Uneven. Black, brown and tan, sometimes with white, gray, red, pink or blue.
• Diameter. Usually a change in size. Most melanomas are wider than 6 millimeters, about a quarter inch, though they can be tiny.
• Evolving. The mole has changed over the past few weeks or months.

NCI adds two warnings. Some melanomas show only one or two of these features. And in people with dark skin, melanoma usually appears somewhere the sun does not reach: under a fingernail or toenail, often as a pigmented streak in the nail, or on a palm or the sole of a foot.

Ferguson's melanoma was found because moles were removed and sent to a lab, not because one looked alarming. Our list of melanoma symptoms covers the signs in more detail.

What happens after a suspicious mole

The lesion is biopsied. NCI describes four ways: a shave biopsy with a razor blade, a punch biopsy that takes a small circle of tissue about 4 millimeters deep, an incisional biopsy that removes part of the growth, and an excisional biopsy that removes all of it.

The pathologist measures thickness in millimeters, and that measurement drives the stage. Stage IA is 1 millimeter or less. Stage IB is between 1 and 2 millimeters without ulceration, meaning without a break in the skin surface. Stage IIA is 1 to 2 millimeters with ulceration, or 2 to 4 without.

Treatment for every stage starts with surgery: a wide local excision, which takes the melanoma plus a margin of normal skin around it. If there is a real chance of spread, surgeons also do a sentinel lymph node biopsy. Dye or a radioactive tracer is injected near the tumor, and the first node it drains to is removed and examined. If that node is clear, no more nodes usually come out. Our page on melanoma treatment covers what follows.

When to get checked

Book an appointment for:

• Any mole meeting one or more of the ABCDE features
• A new dark streak under a fingernail or toenail that you cannot explain by an injury
• A mole that itches, bleeds, crusts or will not heal
• A sore anywhere on the skin that has not healed in four weeks
• A breast lump, a thickened area, skin dimpling, or nipple discharge that is new
• Any breast change at all, even if your last mammogram was normal

A mammogram that was clear last year does not settle a lump you can feel this year. Those are different questions.

What this does not mean

• Everything above about Ferguson comes from statements her spokesperson made in 2023 and 2024. Nothing about her current health is stated or implied here.
• Two cancers within a year is not one cancer spreading. Breast cancer that spreads is still breast cancer, not melanoma.
• Melanoma is not a complication of breast cancer treatment. Hers was found during a procedure, which is coincidence of timing, not cause.
• Survival percentages describe large groups diagnosed years ago. They describe no individual.
• Screening finds most breast cancers early. It does not find all of them, which is why symptoms still matter between appointments.

Sources

• NPR / Associated Press, Sarah, the Duchess of York, undergoes surgery following breast cancer diagnosis — https://www.npr.org/2023/06/25/1184262639/sarah-the-duchess-of-york-undergoes-surgery-following-breast-cancer-diagnosis
• NPR / Associated Press, Sarah, the Duchess of York, diagnosed with skin cancer — https://www.npr.org/2024/01/21/1226007285/sarah-duchess-york-diagnosed-skin-cancer
• NCI, Common Moles, Dysplastic Nevi, and Risk of Melanoma — https://www.cancer.gov/types/skin/moles-fact-sheet
• NCI PDQ, Melanoma Treatment (Patient Version) — https://www.cancer.gov/types/skin/patient/melanoma-treatment-pdq
• U.S. Preventive Services Task Force, Breast Cancer: Screening — https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/breast-cancer-screening
• SEER Cancer Stat Facts, Melanoma of the Skin — https://seer.cancer.gov/statfacts/html/melan.html
• SEER Cancer Stat Facts, Female Breast Cancer — https://seer.cancer.gov/statfacts/html/breast.html

How this article was prepared

An AI-assisted editorial system helped prepare this page. No named medical reviewer has reviewed it unless one is listed.

The National Cancer Information Foundation publishes Cancer Explained. This page is for learning. It is not medical advice and does not suggest a test or treatment.

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