Breast cancer adverse event reports that record this term
- Kind of term
- MedDRA preferred term
- Plain meaning
- breast cancer
What a report is
A report is not proof that the drug was the cause of the event.
FDA says:
Adverse event reports submitted to FDA do not undergo extensive validation or verification. Therefore, a causal relationship cannot be established between product and reactions listed in a report. While a suspected relationship may exist, it is not medically validated and should not be the sole source of information for clinical decision making or other assumptions about the safety or efficacy of a product. Additionally, it is important to remember that adverse event reports represent a small percentage of total usage numbers of a product. Common products may have a higher number of adverse events due to the higher total number of people using the product.
Source: openFDA, Drug Adverse Event Overview, section "Responsible use of the data". The site read the page on . The data have the reports that FDA received through .
FDA also says:
There is no certainty that the reported event (adverse event or medication error) was actually due to the product. FDA does not require that a causal relationship between a product and event be proven, and reports do not always contain enough detail to properly evaluate an event. The information in these reports has not been scientifically or otherwise verified as to a cause and effect relationship and cannot be used to estimate the incidence of these events.
Source: openFDA, Drug Adverse Event Overview. The site read the page on .
Do not rely on openFDA to make decisions regarding medical care. While we make every effort to ensure that data is accurate, you should assume all results are unvalidated.
Source: openFDA, Response of the drug event API (meta.disclaimer). The site read the page on .
Not medical advice. This site counts what was reported to FDA. Questions about a medicine or device belong with a pharmacist or clinician.
Reports on file
From January 2004 to June 2026, FDA received 92,713 adverse event reports that record the MedDRA preferred term Breast cancer. In plain words, the term means: breast cancer. The person who codes a report selects the term that agrees best with the description of the reporter.
FDA received 1,759 reports in the 12 months to June 2026 and 1,861 in the 12 months before. FDA releases FAERS data every quarter, so the newest months are not complete. They grow in later releases.
By reports in the 12 months to June 2026, this term was number 396 of 1,436 reaction terms with a page. Of the 1,332,454 drug reports that FDA received in the 12 months to June 2026, 1,759 (0.1%) record this term. Reports for female patients were 88.2% of the reports that record this term and 52.7% of all drug reports.
The number of people who use the product is not in the data. A count is not a rate.
MedDRA
The Medical Dictionary for Regulatory Activities. The person who codes a report selects the preferred term that agrees best with the description of the reporter. FDA does not publish the description.
Plain meaning
Breast cancer. The words are from the fixed dictionary of this site. They add nothing to a report.
Data version
openFDA FAERS release of 29 Oct 2026. Reports received through 30 Jun 2026.
Drugs in these reports
The table has the 139 drug pages with 100 or more reports that record this term. The rows are in order of name. A drug page with fewer reports for this term is not in the table. The counts are the counts that the site keeps for each reaction term, and a count can be lower than the count of FDA.
FDA says:
Additionally, it is important to remember that adverse event reports represent a small percentage of total usage numbers of a product. Common products may have a higher number of adverse events due to the higher total number of people using the product.
Source: openFDA, Drug Adverse Event Overview. The site read the page on .
Importantly, the AEMS data by themselves are not an indicator of the safety profile of the drug or biologic.
Source: FDA, FDA Adverse Event Monitoring System (AEMS) Public Dashboard. Content current as of . The site read the page on .
| Drug | Class | Reports with this term |
|---|---|---|
| 5-fluorouracil | 143 | |
| Abatacept | Selective T cell costimulation modulator | 180 |
| Abraxane | Microtubule inhibitor | 137 |
| Aclasta | 112 | |
| Actemra | Interleukin-6 receptor antagonist | 392 |
| Activella | Estrogen | 273 |
| Adalimumab | Tumor necrosis factor blocker | 216 |
| Afinitor | Kinase inhibitor | 460 |
| Alendronate sodium | Bisphosphonate | 123 |
| Ambrisentan | Endothelin receptor antagonist | 121 |
| Ampyra | Potassium channel blocker | 116 |
| Anastrozole | Aromatase inhibitor | 346 |
| Arava | Antirheumatic agent | 126 |
| Arimidex | Aromatase inhibitor | 225 |
| Aromasin | Aromatase inhibitor | 242 |
| Aubagio | Pyrimidine synthesis inhibitor | 125 |
| Avastin | Vascular endothelial growth factor inhibitor | 114 |
| Avonex | Interferon beta | 1,107 |
| Capecitabine | Nucleoside metabolic inhibitor | 457 |
| Cenestin | 102 | |
| Certolizumab pegol | Tumor necrosis factor blocker | 161 |
| Cimzia | Tumor necrosis factor blocker | 173 |
| Climara | Estrogen | 174 |
| Clonazepam | Benzodiazepine | 147 |
| Clozaril | Atypical antipsychotic | 200 |
| CombiPatch (estradiol/norethindrone acetate transdermal system) | Estrogen | 130 |
| Conjugated estrogens | Estrogen | 283 |
| Copaxone | 178 | |
| Cosentyx | Interleukin-17A antagonist | 469 |
| Crestor | HMG-CoA reductase inhibitor | 166 |
| Cyclophosphamide | Alkylating drug | 363 |
| Cycrin | 1,362 | |
| Denosumab | RANK ligand inhibitor | 126 |
| Dexamethasone | Corticosteroid | 270 |
| Diovan | Angiotensin 2 receptor blocker | 138 |
| Docetaxel | Microtubule inhibitor | 344 |
| Doxorubicin | Anthracycline topoisomerase inhibitor | 134 |
| Dupixent | Interleukin-4 receptor alpha antagonist | 198 |
| Eliquis | Factor Xa inhibitor | 185 |
| Enbrel | Tumor necrosis factor blocker | 1,954 |
| Endoxan 1000 Mg Poudre Pour Solution Injectable | 136 | |
| Entresto | Angiotensin 2 receptor blocker | 109 |
| Epirubicin | 369 | |
| Estrace | Estrogen | 1,169 |
| Estraderm | 395 | |
| Estradiol | Estrogen | 578 |
| Estratab | 183 | |
| Estratest | 497 | |
| Estrogen | Estrogen | 195 |
| Estrogens | Estrogen | 223 |
| Estropipate | 131 | |
| Etanercept | Tumor necrosis factor blocker | 159 |
| Everolimus | Kinase inhibitor | 190 |
| Evista | Estrogen Agonist/Antagonist | 245 |
| Exemestane | Aromatase inhibitor | 260 |
| Faslodex | Estrogen receptor antagonist | 187 |
| Femara | Aromatase inhibitor | 413 |
| Femhrt | 304 | |
| Fluorouracil | Nucleoside metabolic inhibitor | 153 |
| Forteo | Parathyroid hormone analog | 332 |
| Fosamax | Bisphosphonate | 352 |
| Fulvestrant | Estrogen receptor antagonist | 566 |
| Gilenya | Sphingosine 1-phosphate receptor modulator | 454 |
| Herceptin | HER2/neu receptor antagonist | 264 |
| Humalog | Insulin analog | 175 |
| Humira | 1,084 | |
| Hydroxychloroquine | Antimalarial | 140 |
| Hydroxychloroquine sulfate | Antimalarial | 129 |
| Ibrance | Kinase inhibitor | 348 |
| Infliximab | Tumor necrosis factor blocker | 195 |
| Kesimpta | CD20-directed cytolytic antibody | 120 |
| Kisqali | Kinase inhibitor | 603 |
| Lantus | Insulin analog | 139 |
| Leflunomide | Antirheumatic agent | 228 |
| Letrozole | Aromatase inhibitor | 1,145 |
| Lipitor | HMG-CoA reductase inhibitor | 113 |
| Lyrica | 159 | |
| Medroxyprogesterone | Progestin | 941 |
| Medroxyprogesterone acetate | Progestin | 1,809 |
| Medroxyprogesterone and Medroxyprogesterone Acetate | 171 | |
| Methotrexate | Folate analog metabolic inhibitor | 784 |
| Methotrexate sodium | Folate analog metabolic inhibitor | 188 |
| Mirena | Progestin | 490 |
| Mycophenolate mofetil | Antimetabolite immunosuppressant | 106 |
| Nexium | Proton pump inhibitor | 237 |
| Ocrevus | CD20-directed cytolytic antibody | 402 |
| Ogen | 337 | |
| Omalizumab | Anti-IgE | 102 |
| Omeprazole | Proton pump inhibitor | 110 |
| Orencia | Selective T cell costimulation modulator | 461 |
| Otezla | Phosphodiesterase 4 inhibitor | 210 |
| Paclitaxel | Microtubule inhibitor | 402 |
| Palbociclib | Kinase inhibitor | 264 |
| Perjeta | HER2/neu receptor antagonist | 116 |
| Prednisone | Corticosteroid | 189 |
| Premarin | Estrogen | 9,236 |
| Premphase | Estrogen | 137 |
| Premphase 14/14 | 294 | |
| Prempro | Estrogen | 7,824 |
| Progesterone | Progesterone | 141 |
| Prolia | RANK ligand inhibitor | 523 |
| Prometrium | Progesterone | 271 |
| Provera | Progestin | 7,576 |
| Ranitidine | Histamine-2 receptor antagonist | 35,607 |
| Ranitidine Hci | 186 | |
| Ranitidine hydrochloride | Histamine-2 receptor antagonist | 10,188 |
| Rebif | Interferon beta | 287 |
| Remicade | Tumor necrosis factor blocker | 1,334 |
| Revlimid | Thalidomide analog | 402 |
| Ribociclib | Kinase inhibitor | 232 |
| Rinvoq | Janus kinase inhibitor | 197 |
| Rituxan | CD20-directed cytolytic antibody | 138 |
| Rituximab | CD20-directed cytolytic antibody | 322 |
| Simponi | Tumor necrosis factor blocker | 386 |
| Skyrizi | Interleukin-23 antagonist | 238 |
| Sodium Aurothiomalate | 111 | |
| Stelara | Interleukin-12 antagonist | 375 |
| Sulfasalazine | Aminosalicylate | 240 |
| Synthroid | l-Thyroxine | 125 |
| Taltz | Interleukin-17A antagonist | 103 |
| Tamoxifen | 550 | |
| Tamoxifen citrate | Estrogen Agonist/Antagonist | 124 |
| Taxol | 170 | |
| Tecfidera | 454 | |
| Tiotropium bromide | Anticholinergic | 155 |
| Trastuzumab | HER2/neu receptor antagonist | 329 |
| Tykerb | Kinase inhibitor | 200 |
| Tysabri | Integrin receptor antagonist | 621 |
| Valsartan | Angiotensin 2 receptor blocker | 100 |
| Vinorelbine | Vinca alkaloid | 124 |
| Xeljanz | Janus kinase inhibitor | 308 |
| Xeloda | Nucleoside metabolic inhibitor | 322 |
| Xgeva | RANK ligand inhibitor | 105 |
| Xolair | Anti-IgE | 274 |
| Xyrem | Central nervous system depressant | 178 |
| Zantac | 30,607 | |
| Zoladex | Gonadotropin releasing hormone receptor agonist | 105 |
| Zoledronic acid | Bisphosphonate | 186 |
| Zometa | 324 |
The page of each drug has the count of each reaction term in its reaction lookup.
Drug classes in these reports
The table has the 44 pharmacologic classes with 250 or more reports that record this term. The rows are in order of name.
FDA says:
Additionally, it is important to remember that adverse event reports represent a small percentage of total usage numbers of a product. Common products may have a higher number of adverse events due to the higher total number of people using the product.
Source: openFDA, Drug Adverse Event Overview. The site read the page on .
Importantly, the AEMS data by themselves are not an indicator of the safety profile of the drug or biologic.
Source: FDA, FDA Adverse Event Monitoring System (AEMS) Public Dashboard. Content current as of . The site read the page on .
A class with many reports in all has many reports for almost every term.
Reports by month
FDA releases FAERS data every quarter, so the newest months are not complete. They grow in later releases.
Patients in these reports
| Age | Reports | Share | Share as a bar |
|---|---|---|---|
| Under 2 | 5 | under 0.1% | |
| 2 to 11 | 13 | under 0.1% | |
| 12 to 17 | 14 | under 0.1% | |
| 18 to 44 | 4,892 | 5.3% | |
| 45 to 64 | 22,806 | 24.6% | |
| 65 to 74 | 8,056 | 8.7% | |
| 75 and over | 3,323 | 3.6% | |
| Age not given | 53,604 | 57.8% |
| Sex | Reports | Share | Share as a bar |
|---|---|---|---|
| Female | 81,766 | 88.2% | |
| Male | 1,143 | 1.2% | |
| Unknown or not given | 9,804 | 10.6% |
Age and sex are as the report gives them. 79.8% of these reports give the United States as the country.
Terms near this one
- Brain fog
- Brain injury
- Brain neoplasm
- Brain oedema
- Breast cancer female
- Breast cancer metastatic
- Breast cancer stage I
- Breast cancer stage II
These are the next terms in the A to Z list. The links are for navigation.
Official pages
- MedWatch Online Voluntary Reporting FormThe online form of FDA for a voluntary report.
- MedWatch: The FDA Safety Information and Adverse Event Reporting ProgramThe page of the FDA program that receives reports about drugs and devices.
- FDA Adverse Event Monitoring System (AEMS) Public DashboardThe public dashboard of FDA for adverse event reports on drugs and biologics.
The site checked these addresses on . The links open in a new tab.
Cite this page
Reported Reactions. Breast cancer: adverse event reports that record this term. https://reportedreactions.com/reaction/breast-cancer/ Source: U.S. Food and Drug Administration, openFDA Drug Adverse Event (FAERS) files, release of . Reports received through .
Where the data come from
The counts come from the openFDA Drug Adverse Event (FAERS) bulk files, release of 29 Oct 2026. The files have the reports that FDA received through 30 Jun 2026. A drug name is the name on the report. The site matches it to a brand name or a generic name of the National Drug Code Directory of 2 Nov 2026. A class is the pharmacologic class (EPC) of the FDA label.
The count has the reports with each spelling of one MedDRA preferred term. The site does not publish a report narrative, a lot number, a detail of a patient or the identity of a reporter. The record of FDA is the authority. See how the site counts reports, the data sources and the corrections page.
Questions
What does Breast cancer mean in an adverse event report?
In plain words: breast cancer. It is a MedDRA preferred term. FDA codes the description of a reporter with the MedDRA dictionary. The openFDA files do not have the description itself, and this site does not show it.
Does a drug in the table mean that the drug was responsible for this reaction?
No. FDA says:
No individual drug is connected to any individual reaction.
Source: openFDA, Drug Adverse Event Overview. The site read the page on .
When a report lists multiple drugs and multiple reactions, there is no way to conclude from the data therein that a given drug is responsible for a given reaction.
Source: openFDA, Drug Adverse Event Overview. The site read the page on .
What does this page tell a person who has this symptom?
This page gives counts of reports. It cannot assess a person. A pharmacist or a clinician can assess a person.
If this is a medical emergency, please call 911.
Source: FDA, MedWatch Online Voluntary Reporting Form. The site read the page on .