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Magseed®

Meet the seed that changed the game

The original Magseed® is known worldwide as a simple and effective alternative to wire localisation. So far, it’s been used in over 500,000 localisations1 — and counting.

So far. So good.

Magseed® marker was the first localisation seed to be routinely used on all six continents that perform breast surgery. It’s now the number one choice for thousands of physicians and used in more countries than any other wire-free marker2.

Tried and tested

More than 15,000 patients have been involved in Magseed® clinical trials. That’s more than all the other seed devices combined3.

So far. So good.

Magseed® marker was the first localisation seed to be routinely used on all six continents that perform breast surgery. It’s now the number one choice for thousands of physicians and used in more countries than any other wire-free marker2.

Tried and tested

More than 15,000 patients have been involved in Magseed® clinical trials. That’s more than all the other seed devices combined3.

Easier for patients

The Magseed® marker helps remove some of the stress of breast cancer surgery. Patients can have their seed placed any time before surgery, when convenient for them, where it is designed to stay in place1.

Choose your approach

During surgery, the seed’s pinpoint signal allows the surgeon to take the most cosmetic approach to removing it. This reliable signal means the vast majority of patients are now having their cancer removed in one operation.

Why Magseed®?

The Magseed marker has been designed to simplify breast cancer treatment, from the time the cancer is marked, through to when it’s removed in surgery.

  • Accurate Placement

    With the choice of when and where to mark the cancer, you have ultimate control over placement.

  • Firmly Implanted

    The Magseed marker won't move, break, or deactivate — no matter when it's implanted.

  • Pinpoint Detection

    Detectable to the millimeter, Magseed will guide you to the tumor with absolute precision.

  • Accurate Removal

    Being certain of the cancer’s location means you can remove it while leaving behind as much healthy tissue as possible.

Trusted by experts, demanded by patients

Find out how the Magseed® marker has allowed physicians to take back control of their schedules, achieve low re-excision rates and provide a better patient experience.

Prof. Bruce Man
Mrs. Victoria Sinnet
Dr. Emilia Dauway
Dr. Ashley Simpson
Ruth Riley & Dr. Julian Kim
Dr. Abigail Caudle
Dr. Patrick Borgen
Dr. Tammy De La Melena
Dr. Abigail Caudle & Dr. Michael Alvarado
Dr. Nina Klein
Dr. Lucy De La Cruz
Dr. Ramya Pham
Magseed has simplified the whole process of the pre-operative localisation for the surgery.
Dr. Nina Klein UH Cleveland Medical Center
The advantage of seeds is that they can be placed anytime. That way, on the day of surgery you really just have to deal with the surgery schedule.
Dr. Abigail Caudle MD Anderson Cancer Center
Magseed has had a great positive effect on our department. There's easier coordination with our surgeons, with the operating room, and just scheduling our patients.
Dr. Heather Greenwood University of California San Francisco
I would highly recommend having the Magseed marker versus wires. It's just so much better for the patient.
Mindy Cartwright Breast Health Paducah
Magseed has simplified the whole process of the pre-operative localisation for the surgery.
Dr. Nina Klein UH Cleveland Medical Center
The advantage of seeds is that they can be placed anytime. That way, on the day of surgery you really just have to deal with the surgery schedule.
Dr. Abigail Caudle MD Anderson Cancer Center
Magseed has had a great positive effect on our department. There's easier coordination with our surgeons, with the operating room, and just scheduling our patients.
Dr. Heather Greenwood University of California San Francisco
I would highly recommend having the Magseed marker versus wires. It's just so much better for the patient.
Mindy Cartwright Breast Health Paducah

Backed by data

500,000+

total patients treated1

98%

placement accuracy3

0.01%

migration rate2

2.87%

re-excision rate in a large multi-centre phase III RCT study4

99.8%

retrieval rate1

Clinical data

Related products

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Magtrace®

A simple solution for breast cancer staging

Resources

Downloads

Downloadable product and technique brochures for the Magseed® marker.

FAQs

View frequently asked questions about the Magseed® marker.

Clinical data: seeds

Browse our vast collection of unrivalled Magseed® marker data.

  1. 1 Data on file at Endomag. Data Correct as of March 2025. (Internal Meta-Analysis 090724 of Clinical Studies showing 0.01% migration rate)
  2. 2 Data on file at Endomag. Data correct as of March 2024.
  3. 3 Data on file at Endomag. Data correct as of June 2025. (Internal Meta-Analysis 300625 of Clinical Studies)
  4. 4 Micha et al (2021), Patient and clinician satisfaction and clinical outcomes of Magseed compared with wire-guided localisation for impalpable breast lesions. Breast Cancer. 2021 Jan;28(1):196-205. doi: 10.1007/s12282-020-01149-1 (Study featuring 128 Magseed® marker procedures)
  5. 5 Pantiora et al (2023), Magnetic Seed vs Guidewire Breast Cancer Localization With Magnetic Lymph Node Detection: A Randomized Clinical Trial. JAMA Surg. 2024 Mar 1;159(3):239-246. doi: 10.1001/jamasurg (Multi-center study featuring 426 patients)
  6. 6 Boland et al (2023) Isotropy of Seed Localisation for Breast-conserving Surgery – A Laboratory Assessment [Poster]. ASBrS Annual Meeting, 26-30 April 2023.

Get started with your Magseed® trial

Give your patients a better standard of breast cancer surgery without the need for wires and radioactivity. Set up a Magseed® marker evaluation today.

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