You can donate breast tissue, but not in the way most people imagine when they first hear the phrase. Breast tissue donation is not a transplant procedure where your tissue goes to another person’s body. Instead, it is a research donation: healthy or diseased breast tissue is collected, processed, and stored in specialized biobanks so that scientists can study breast cancer prevention, detection, and treatment. The process looks different depending on whether you are a healthy volunteer, a surgical patient, or someone planning a posthumous gift, and the science that comes out of these donations is shaping how researchers understand the disease at its earliest stages.
Why Researchers Need Healthy Breast Tissue
For decades, breast cancer research relied almost entirely on tumor samples. If scientists wanted to understand how breast cells go wrong, they studied cells that had already gone wrong. The problem was that they had very little “normal” tissue to compare against. Without a clear picture of what healthy breast tissue looks like at the molecular level, it is difficult to identify the earliest changes that lead to cancer.
Studies of tissue adjacent to tumors turned out to be an imperfect substitute. Research on what is called field cancerization has shown that tissue surrounding a tumor is not truly normal; it often contains molecular abnormalities distinct from the tumor itself.1PubMed Central. Field cancerization in breast cancer That means comparing a tumor to the tissue right next to it can miss important differences between cancerous and genuinely healthy cells. Researchers needed tissue from women who had never had breast cancer at all.
This gap led to the creation of dedicated biobanks for healthy breast tissue. The most prominent is the Susan G. Komen Tissue Bank at the Indiana University Simon Cancer Center, which was specifically built to collect and store breast tissue from healthy volunteer donors. The bank enrolls women who provide questionnaire data, blood samples, and up to four breast tissue biopsies, prepared both as preserved and frozen specimens.2PubMed Central. The Susan G. Komen for the Cure Tissue Bank at the IU Simon Cancer Center: a unique resource for defining the “molecular histology” of the breast The resulting collection is available to researchers worldwide through a proposal and review process.
How Healthy Volunteers Donate Breast Tissue
If you are a healthy woman considering donating breast tissue for research, the procedure is a core-needle biopsy, the same technique used in diagnostic breast imaging. An experienced radiologist performs an ultrasound-guided biopsy, guiding a thin needle into the breast to extract small cylinders of tissue.3Cancer Research. Histologic markers of mammographic breast density: core-needle biopsy tissue from healthy volunteers The procedure typically uses local anesthesia, takes about 15 to 30 minutes, and does not require general sedation or an overnight hospital stay.
Donors at programs like the Komen Tissue Bank go through a screening process that includes a health questionnaire covering reproductive history, lifestyle factors, and family cancer history. Blood is drawn alongside the breast biopsies so researchers can correlate tissue characteristics with circulating hormone levels and other biomarkers. Some donors provide tissue from more than one area of the breast so scientists can study regional differences in density and cell composition.
The Komen Tissue Bank has made a deliberate effort to reach women beyond its Indiana base. The program has traveled to locations across the United States to collect tissue from volunteer donors, aiming to build a collection that mirrors the country’s demographics.4Cancer Epidemiology, Biomarkers & Prevention. Abstract A072: Biobanking healthy tissue in the Susan G. Komen tissue bank: Comparing Indiana and non-Indiana residents These mobile collection events make participation possible for women who do not live near the bank’s home institution.
Donating Tissue After a Surgery
The second major pathway for breast tissue donation does not involve a separate biopsy at all. When someone undergoes a mastectomy, lumpectomy, or reduction mammoplasty, tissue is removed as part of the surgical procedure. After the pathologist takes what is needed for diagnosis, leftover tissue can be directed to research with the patient’s consent.
Surveys of cancer patients suggest that support for this kind of donation is high. In one study, roughly 84 percent of oncology patients said they would allow their leftover surgical tissue to be used in research approved by an ethics committee, and among those who agreed, 96 percent were also willing to have remaining tissue stored for future studies beyond the initial project.5PubMed Central. Oncology patients overwhelmingly support tissue banking The most common motivations were possible benefits to family members’ health, personal health benefits, and benefit to future patients.
Consent preferences varied. About 71 percent of patients preferred a system where they only needed to be asked once for permission, rather than being re-contacted every time a new study wanted to use their stored sample.5PubMed Central. Oncology patients overwhelmingly support tissue banking This is a meaningful finding for biobank design, because repeated consent requests can create logistical barriers and donor fatigue.
Reduction mammoplasties, performed for cosmetic or medical reasons in women without cancer, are a particularly valuable source of genuinely normal tissue. One major breast cell atlas project assembled its collection specifically from donors who had undergone reduction mammoplasties or risk-reduction mastectomies.6PubMed Central. Establishment and Culture of Patient-Derived Breast Organoids For researchers, this tissue bridges the gap between a small core-needle biopsy and a full surgical specimen, providing larger amounts of healthy tissue for experiments that require more material.
Post-Mortem Tissue Donation
For people living with metastatic breast cancer, tissue donation after death represents a different kind of contribution. Because metastatic disease spreads to organs throughout the body, a standard surgical biopsy during life typically captures only one site. A post-mortem donation can provide researchers with tumor tissue from multiple organs, giving a much fuller picture of how cancer evolves and adapts as it spreads.
These donations are arranged through what is called a rapid autopsy, a specialized procedure performed within hours of death to preserve tissue quality. Programs like the UPTIDER post-mortem tissue donation initiative coordinate with patients and families in advance, so that logistical arrangements are already in place.7Nature / npj Breast Cancer. Rapid autopsies to enhance metastatic research: the UPTIDER post-mortem tissue donation program The topic is understandably sensitive, but participants and their families often describe the decision as a way to create something meaningful from their experience with the disease.
Rapid autopsies require a team on standby and access to a pathology suite within a narrow time window, which makes them logistically complex and limits how many centers can offer the option. If this is something you are interested in, the conversation needs to happen well before the end of life so your care team can identify a participating program and make the necessary arrangements.
What Happens to Tissue After Collection
Donated breast tissue does not sit in a freezer waiting for a single study. It is processed into multiple formats to serve different research needs. A single biopsy might be split into formalin-fixed, paraffin-embedded blocks for traditional microscopy and frozen specimens for molecular analysis.2PubMed Central. The Susan G. Komen for the Cure Tissue Bank at the IU Simon Cancer Center: a unique resource for defining the “molecular histology” of the breast
Preserving tissue quality is a genuine technical challenge. Researchers need to extract high-quality DNA, RNA, and proteins from the same sample, and the way tissue is handled immediately after removal affects all of those downstream uses. Studies on breast cancer specimen handling have shown that stabilization methods can maintain RNA integrity even after hours at room temperature or repeated freeze-thaw cycles, which is critical for ensuring that banked tissue remains useful for years.8PubMed Central. Maintaining Breast Cancer Specimen Integrity and Individual or Simultaneous Extraction of Quality DNA, RNA, and Proteins from Allprotect-Stabilized and Nonstabilized Tissue Samples
Some donated tissue is used to grow organoids, which are three-dimensional miniature versions of breast tissue cultured in a lab dish. Protocols now exist for establishing organoids from both tumor tissue and normal breast tissue obtained from reduction mammoplasties. These organoids can be expanded, frozen, thawed, and shared across labs, essentially turning a single donation into a renewable research resource.6PubMed Central. Establishment and Culture of Patient-Derived Breast Organoids
What Donated Tissue Has Taught Us
The cumulative effect of breast tissue donations has been transformative for basic science. Normal breast tissue is not a uniform substance; it is a complex mix of epithelial cells, fat, connective tissue, and immune cells, all with distinct molecular profiles. Research has established that this molecular diversity within normal tissue can produce abnormal cell populations that may eventually contribute to cancer.9PubMed Central. Molecular Portrait of the Normal Human Breast Tissue and Its Influence on Breast Carcinogenesis In other words, the seeds of cancer may be detectable in tissue that looks perfectly healthy under a standard microscope.
Large-scale donation efforts have enabled projects that would have been impossible with a handful of samples. The Human Breast Cell Atlas, for instance, profiled over 714,000 cells from 126 women, identifying 12 major cell types and 58 distinct biological cell states within normal breast tissue.10PubMed Central. A spatially resolved single-cell genomic atlas of the adult human breast A separate atlas assembled from 55 donors who had undergone reduction mammoplasties or risk-reduction mastectomies mapped how cell populations shift with age, hormonal status, and other factors.11PubMed Central. A single-cell atlas enables mapping of homeostatic cellular shifts in the adult human breast These atlases serve as reference maps for the entire field, letting researchers compare any suspicious tissue against a detailed baseline.
Donated tissue has also been central to understanding how reproductive history reshapes breast biology. Studies using banked specimens have found that parity, the number of pregnancies and births a woman has had, is linked to greater epithelial area, higher expression of estrogen receptors in breast epithelial cells, and lower stromal proliferation.12PubMed Central. Association of reproductive history with breast tissue characteristics and receptor status in the normal breast Breastfeeding duration was also positively associated with epithelial area and progesterone receptor expression. These findings help explain why reproductive factors influence breast cancer risk, a connection epidemiologists have observed for decades but could not fully explain without tissue-level data.
How Age and Hormones Change the Tissue You Could Donate
Not all donated breast tissue is equal from a research perspective, and that is actually the point. Scientists actively seek tissue from women of different ages, reproductive histories, and hormonal profiles precisely because breast tissue changes dramatically across the lifespan.
The structural composition of the breast shifts with age and childbearing. In younger, nulliparous women, the breast is predominantly composed of the least-developed lobular structures. After pregnancy, more mature lobular types become dominant and stay that way through the fourth decade of life, after which the breast gradually returns to a composition resembling its pre-pregnancy state.13PubMed. Influence of age and parity on the development of the human breast These shifts matter for cancer risk research, because the different lobular types have different vulnerabilities to malignant transformation.
Hormone levels also leave measurable traces in breast architecture. In premenopausal donors, higher prolactin levels have been linked to larger lobular structures, greater presence of fat tissue near the lobules, and increased epithelial area, while testosterone levels were associated with higher lobule counts regardless of whether a woman had given birth.14PubMed Central. Serum Hormone Levels and Normal Breast Histology Among Premenopausal Women Longitudinal biopsies from healthy women have even revealed that changes in mammographic density over time correspond to shifts in gene expression, including genes in pathways already implicated in cancer development.15PubMed. A Longitudinal Study of the Association between Mammographic Density and Gene Expression in Normal Breast Tissue
All of this means your donation carries more scientific value when the biobank also has detailed information about your age, menstrual cycle, pregnancies, breastfeeding history, and hormone use. That is why the intake questionnaire at programs like the Komen Tissue Bank is so thorough: the tissue itself is only half the story.
The Diversity Problem in Breast Tissue Banks
One of the persistent challenges in breast tissue research is that the donor pool does not reflect the broader population. Research has consistently shown that race and ethnicity affect cancer incidence, survival, treatment response, and the molecular pathways involved in the disease, yet many oncological studies have failed to include diverse participant groups.16PubMed Central. Analysis of Racial/Ethnic Representation in Select Basic and Applied Cancer Research Studies If the tissue in a biobank comes overwhelmingly from one demographic group, the research built on that tissue may not apply equally to everyone.
This is not an abstract concern. Black women in the United States are more likely to be diagnosed with aggressive triple-negative breast cancer subtypes and have higher breast cancer mortality than white women. If the reference maps of “normal” breast tissue are built primarily from white donors, researchers may miss molecular features that are relevant to understanding risk and disease progression in other groups. The Komen Tissue Bank has acknowledged this by actively recruiting donors from underrepresented communities across the country, but closing the gap requires both institutional effort and broader awareness that tissue donation is open to women of all backgrounds.
Less Invasive Alternatives and Related Donations
Not every breast-related research donation requires a needle biopsy. Nipple aspirate fluid, collected using a modified breast pump, offers a non-invasive way to obtain breast epithelial cells. In one feasibility study, fluid was successfully obtained from 99 percent of eligible participants, and the samples were cellular enough for cytology analysis in over 95 percent of cases.17PubMed Central. Nipple aspirate fluid: a promising non-invasive method to identify cellular markers of breast cancer risk Abnormal findings in nipple aspirate fluid correlated with increased breast cancer risk, making this a potentially useful screening and research tool.
Breast milk donation is a separate field entirely and operates under different rules. Human milk banks collect, pasteurize, and distribute donor milk to premature or medically fragile infants. While breast milk is also used in some research contexts, the infrastructure and regulatory framework are distinct from tissue banking. If you are interested in donating breast milk, you would go through a milk bank accredited by an organization like the Human Milk Banking Association of North America, not a tissue biobank.
For people who want to contribute to breast cancer research but are not comfortable with a biopsy, blood donations and survey participation at tissue bank events are also valuable. Many biobanks pair tissue with blood samples and detailed lifestyle questionnaires, and even the non-tissue components of a donation contribute to the research ecosystem. Some programs accept blood and questionnaire data on their own, without requiring a biopsy, though policies vary by institution.
How to Find a Program and What to Expect
If you are interested in donating breast tissue as a healthy volunteer, the Komen Tissue Bank is the most established program in the United States and accepts donors at both its Indianapolis location and traveling collection events. The bank’s website lists upcoming events and eligibility criteria. You do not need a referral from a doctor, and there is no charge for participating.
If you are a surgical patient whose tissue might be useful for research, the conversation usually starts with your surgeon or the hospital’s pathology department. Many academic medical centers have biobanking programs that will approach you about consent before or after surgery. You are never obligated to participate, and declining does not affect your medical care. If your hospital does not have a biobanking program and you want your tissue to go to research, ask whether it can be sent to an external biobank after pathology is complete.
For post-mortem donation of metastatic tissue, the starting point is your oncologist or a palliative care team, who can help you connect with a rapid autopsy program if one is available in your area. These programs are less common and tend to be concentrated at major cancer research centers, so geography can be a limiting factor. Planning ahead is essential, because the logistics cannot be arranged on short notice.
Across all donation types, your tissue is de-identified before it enters the research pipeline. Your name is replaced with a code, and researchers who receive samples do not know who you are. Consent forms will spell out what information is linked to your sample, how long it will be stored, and whether you will be contacted about future studies. Reading that form carefully is worth the time, because consent models differ: some banks ask for broad consent covering any future approved research, while others use a more restrictive approach that limits use to specific study types.