Matching methods in precision oncology: An introduction and illustrative example.
BACKGROUND
Randomized controlled trials (RCTs) are uncommon in precision oncology. We provide an introduction and illustrative example of matching methods for evaluating precision oncology in the absence of RCTs. We focus on British Columbia's Personalized OncoGenomics (POG) program, which applies whole-genome and transcriptome analysis (WGTA) to inform advanced cancer care.


METHODS
Our cohort comprises 230 POG patients enrolled between 2014 and 2015 and matched POG-naive controls. We generated our matched cohort using 1:1 propensity score matching (PSM) and genetic matching prior to exploring survival differences.


RESULTS
We find that genetic matching outperformed PSM when balancing covariates. In all cohorts, overall survival did not significantly differ across POG and POG-naive patients (p > 0.05). Stratification by WGTA-informed treatment indicated unmatched survival differences. Patients whose WGTA information led to treatment change were at a reduced hazard of death compared to POG-naive controls in all cohorts, with estimated hazard ratios ranging from 0.33 (95% CI: 0.13, 0.81) to 0.41 (95% CI: 0.17, 0.98).


CONCLUSION
These results signal that clinical effectiveness of precision oncology approaches will depend on rates of genomics-informed treatment change. Our study will guide future evaluations of precision oncology and support reliable effect estimation when RCT data are unavailable.
['Weymann|Deirdre|D|0000-0002-3072-5657', 'Laskin|Janessa|J|', 'Jones|Steven J M|SJM|', 'Lim|Howard|H|', 'Renouf|Daniel J|DJ|', 'Roscoe|Robyn|R|', 'Schrader|Kasmintan A|KA|', 'Sun|Sophie|S|', 'Yip|Stephen|S|', 'Marra|Marco A|MA|', 'Regier|Dean A|DA|']
D000328:Adult D000368:Aged D005260:Female D005820:Genetic Testing D006801:Humans D008297:Male D008875:Middle Aged D009369:Neoplasms D057285:Precision Medicine D057216:Propensity Score D016019:Survival Analysis D059467:Transcriptome
matching administrative data genomic sequencing precision medicine quasi-experimental methods