Breakthrough test performance
Galleri® is next-level cancer screening designed to detect the previously undetectable1
The Galleri test does not detect a signal for all cancers and not all cancers can be detected in the blood. False positive and false negative results do occur.
The Galleri test does not detect a signal for all cancers and not all cancers can be detected in the blood. False positive and false negative results do occur.
Revolutionizing cancer screening with a clinically-validated blood test
Galleri is supported by clinical studies with over 20,000 individuals. Galleri’s test performance was validated in the PATHFINDER and CCGA3 studies.
A prospective study of a Multi-Cancer Early Detection Blood Test2
Cohort: >6,600 adults ages 50-79y without clinical suspicion of cancer, and with and without additional cancer risk factors from 7 U.S. sites - Intended use population
Study Design: Prospective, interventional, return-of-results study to evaluate the clinical implementation of an MCED test.
Study Objectives: Assess the extent of diagnostic testing required to achieve diagnostic resolution, evaluate test performance, and evaluate participant reported outcomes.
Key Outcomes: Adding MCED screening approximately doubled the number of cancers detected. Median time to diagnostic resolution was 79 days (shorter for true positive; longer for false positive). High accuracy of predicted cancer signal origin enabled targeted diagnostic evaluations. Most diagnostic evaluations involved imaging. Key performance metrics were validated and MCED screening was safely implemented. The results from PATHFINDER support feasibility of broad screening use of Galleri.
Clinical validation of a targeted methylation-based multi-cancer early detection test using an independent validation set1
Cohort: >4,000 participants without a prior history of cancer from 142 sites, 70% with newly diagnosed cancer, 30% cancer free at enrollment and at 1 year
Study Design: Case- controlled observational study to validate an MCED test regarding sensitivity, specificity and cancer signal origin prediction
Study Objectives: Validate a MCED test version further refined for use as a screening tool.
Key Outcomes: The Galleri test demonstrated high specificity with a low false-positive rate, sensitivity that varied by cancer class and increased with increasing cancer stage, high accuracy of CSO prediction and detected a cancer signal across a wide diversity of cancers and cancer stages. Results from CCGA3 support the feasibility of use as a complement to existing single-cancer screening tests.
Galleri sets the standard for multi-cancer early detection
To achieve the benefits of early detection while minimizing harms, multi-cancer early detection requires low false positive rates due to high specificity, accurate localization of organ/tissue origin, and higher sensitivity of the deadliest cancer types.3
Screening for many types of cancer
Galleri detects a signal shared by more than 50 cancer types1 with a single blood test, most of which lack routine screening tests. In a clinical study, Galleri approximately doubled the number of cancers detected with recommended screening.2 In the same study, 48% of confirmed cancers that were detected by Galleri were in stages I-II.2 Galleri goes beyond routine cancer screenings (breast, lung, colon, cervical, and prostate) to screen for many cancers.
99.5% Specificity1,2
Galleri has a specificity of 99.5%, which means that it has a low false positive rate of 0.5%. A low false positive rate helps minimize unnecessary diagnostic procedures.
Specificity = The proportion of people without cancer who received "No Cancer Signal Detected" results.
43.1% Positive Predictive Value2
The Galleri’s positive predictive value (PPV) is 43.1%, meaning that about 4 out of 10 individuals with a Cancer Signal Detected result are expected to have a confirmed cancer diagnosis following diagnostic workup. Galleri’s PPV helps healthcare providers set expectations when discussing appropriate next steps for diagnostic workup.
Learn more about the Galleri test's PPV
Positive Predictive Value = The proportion of people with Cancer Signal Detected results diagnosed with cancer
98.5% Negative Predictive Value2
The negative predictive value (NPV) for Galleri is 98.5%, which provides confidence that a No Cancer Signal Detected result is likely a true negative.
Negative Predictive Value = The proportion of people with No Cancer Signal Detected results without cancer.
88% Cancer Signal Origin Accuracy2
Galleri's highly accurate Cancer Signal Origin (CSO) prediction helps guide diagnostic evaluation. When a cancer signal is detected, Galleri predicts up to two Cancer Signal Origins by comparing the methylation pattern to the patterns of 21 possible CSO predictions. In study participants diagnosed with cancer (true positives), the first or second predicted CSO was accurate 88% of the time. In those study participants, the predicted CSO(s) was consistent with the type of cancer confirmed through diagnostic workup.2 Predicting the origin of the cancer signal helps healthcare providers select the appropriate follow-up diagnostic tests or procedures to confirm the diagnosis.1
Cancer Signal Origin Accuracy = The proportion of correctly predicted first (or second) CSO prediction(s) among study participants with cancer and "Cancer Signal Detected" results.
| CSO Reported | What Is Included |
|---|---|
| Anus | Anus |
| Bladder, Urothelial Tract | Bladder, Renal Pelvis, Urether, Urethra |
| Bone and Soft Tissue | Skeletal muscle and other connective tissue, Vascular Tissue, Bone and cartilage |
| Breast | Breast |
| Cervix | Cervix |
| Colon/Rectum | Colon, Rectum, Appendix |
| Head and Neck | Oropharynx, Hypopharynx, Nasopharynx, Larynk, Lip and oral cavity (inluding oral tongue), Nasal cavity, Paranasal sinuses, Major salivary glands |
| Kidney | Kidney |
| Liver, Bile Duct | Liver, Intrahepatic bile duct |
| Lung | Lung, Bronchus |
| Lymphoid Lineage | Lymphoid Lineage |
| Melanocytic Lineage | Melanocytic Lineage |
| Myeloid Lineage | Myeloid Lineage |
| Neuroendocrine Cells of Lung or other Organs | Neuroendocrine Cells of Lung or other Organs |
| Ovary | Ovary, Fallopian tube, Primary peritoneum |
| Pancreas, Gallbladder | Pancreas, Extrahepatic bile duct, Gallbladder |
| Plasma Cell Lineage | Plasma Cell Lineage |
| Prostate | Prostate |
| Stomach, Esophagus | Stomach, Esophagus |
| Thyroid Gland | Thyroid Gland |
| Uterus | Uterus |
76.3% sensitivity for 12 deadly cancers1
Galleri has high sensitivity (76.3%) for 12 deadly cancer classes* that comprise two-thirds of all cancer deaths.4 Higher sensitivity for the deadliest cancers helps minimize overdiagnosis and/or overtreatment of indolent cancers.3 More aggressive cancers, such as pancreatic cancer, tend to release more cell-free DNA into the bloodstream at early stages and are more likely to be detected by the Galleri test.1 The overall sensitivity for cancer detection is 51.5% for all cancers and across all stages. This provides the opportunity to detect many additional cancers when added to recommended single-cancer screening.
Sensitivity = The proportion of people with cancer who received "Cancer Signal Detected" results.
*Anus, bladder, colon/rectum, esophagus, head and neck, liver/ bile duct, lung, lymphoma, ovary, pancreas, plasma cell neoplasm, and stomach
| Cancer Classes | Sensitivity, proportion of true positives |
|---|---|
| Liver/Bile-duct |
|
| Head and Neck |
|
| Esophagus |
|
| Pancreas |
|
| Ovary |
|
| Colon/Rectum |
|
| Anus |
|
| Cervix |
|
| Urothelial Tract |
|
| Lung |
|
| Plasma Cell Neoplasm |
|
| Gallbladder |
|
| Stomach |
|
| Sarcoma |
|
| Lymphoma |
|
| Other |
|
| Melanoma |
|
| Lymphoid Leukemia |
|
| Bladder |
|
| Breast |
|
| Uterus |
|
| Myeloid Neoplasm |
|
| Kidney |
|
| Prostate |
|
| Thyroid |
|
See publications supporting Galleri test performance
Advancing cancer screening with ongoing clinical studies
GRAIL has and continues to conduct multiple studies with over 300,000 participants as part of its clinical development. To support and validate our technology, studies are being performed at leading health systems and community and academic medical centers in the U.S. and UK.
Hear from Galleri patients and providers
The Galleri test is recommended for use in adults with an elevated risk for cancer, such as those aged 50 or older. The Galleri test does not detect all cancers and should be used in addition to routine cancer screening tests recommended by a healthcare provider. Galleri is intended to detect cancer signals and predict where in the body the cancer signal is located. Use of Galleri is not recommended in individuals who are pregnant, 21 years old or younger, or undergoing active cancer treatment.
Results should be interpreted by a healthcare provider in the context of medical history, clinical signs and symptoms. A test result of No Cancer Signal Detected does not rule out cancer. A test result of Cancer Signal Detected requires confirmatory diagnostic evaluation by medically established procedures (e.g. imaging) to confirm cancer.
If cancer is not confirmed with further testing, it could mean that cancer is not present or testing was insufficient to detect cancer, including due to the cancer being located in a different part of the body. False-positive (a cancer signal detected when cancer is not present) and false-negative (a cancer signal not detected when cancer is present) test results do occur. Rx only.
The GRAIL clinical laboratory is certified under the Clinical Laboratory Improvement Amendments of 1988 (CLIA) and accredited by the College of American Pathologists. The Galleri test was developed and its performance characteristics were determined by GRAIL. The Galleri test has not been cleared or approved by the Food and Drug Administration. The GRAIL clinical laboratory is regulated under CLIA to perform high-complexity testing. The Galleri test is intended for clinical purposes.
Klein EA, Richards D, Cohn A, et al. Clinical validation of a targeted methylation-based multi-cancer early detection test using an independent validation set. Ann Oncol. 2021;32(9):1167-77. DOI: https://doi.org/10.1016/j.annonc.2021.05.806.
Schrag D, McDonnall CH, Naduld L, et al. PATHFINDER: A Prospective Study of a Multi-Cancer Early Detection Blood Test. Presentation at European Society of Medical Oncology (ESMO) Congress September 9-13, 2022; Paris, France.
Hackshaw A, Clarke CA, Hartman AR. New genomic technologies for multi-cancer early detection: Rethinking the scope of cancer screening. Cancer Cell. 2022;40(2):109-113. DOI: https://doi.org/10.1016/j.ccell.2022.01.012.
American Cancer Society. Cancer Facts & Figures 2022. Atlanta: American Cancer Society; 2022 https://www.cancer.org/research/cancer-facts-statistics/all-cancer-facts-figures/cancer-facts-figures-2022.html. GRAIL, Inc. Data on file GA-2021-0065.
Liu MC, Oxnard GR, Klein EA, et al. Sensitive and specific multi-cancer detection and localization using methylation signatures in cell-free DNA. Ann Oncol. 2020;31(6):745-759. DOI: https://doi.org/10.1016/j.annonc.2020.02.011.
100,000 tests. GRAIL, Inc. Data on File: GA-2022-0078.