Reproducibility of a Breast Cancer Gene Expression Test
Author Information
Author(s): Ach Robert A, Floore Arno, Curry Bo, Lazar Vladimir, Glas Annuska M, Pover Rob, Tsalenko Anya, Ripoche Hugues, Cardoso Fatima, Assignies Mahasti Saghatchian, Bruhn Laurakay, Van't Veer Laura J
Primary Institution: Agilent Laboratories
Hypothesis
What factors contribute to variability in gene expression measurements across different laboratories?
Conclusion
The study found that a specific breast cancer gene expression signature was highly reproducible across three laboratories despite some variability in the measurement process.
Supporting Evidence
- The study used identical input RNA across all experiments.
- RNA labeling was identified as the largest contributor to interlaboratory variation.
- The results showed high intralaboratory and interlaboratory reproducibility.
- Strictly controlled standard operating procedures were followed.
Takeaway
Scientists checked if a test for breast cancer worked the same way in different labs, and it did, which is good news for doctors and patients.
Methodology
The study involved comparing gene expression measurements from the same RNA samples processed in three different laboratories using standardized protocols.
Potential Biases
Inter-individual variability could not be fully separated from laboratory variability.
Limitations
The study could not measure every possible source of variation due to the experimental setup.
Participant Demographics
Total RNA from four breast tumors was used.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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