Willem H Collier

I am an Assistant Professor of Clinical Population and Public Health Sciences in the Division of Biostatistics of the Department of Population and Public Health Sciences at the University of Southern California. I support the design, conduct, and analysis of pediatric cancer clinical trials of the Children’s Oncology Group, where I focus on supportive care, survivorship, and cellular therapy trials. I also work on statistical methods for the evaluation of surrogate endpoints, focusing on Bayesian hierarchical modeling for meta-regression. Through my work in surrogate endpoints I collaborate with the Chronic Kidney Disease Epidemiology Collaboration.

• Otoprotective Effects of Sodium Thiosulfate by Demographic and Clinical Characteristics: A Report From Children’s Oncology Group Study ACCL0431. Pediatr Blood Cancer. 2025 Mar; 72(3):e31479.. View in PubMed
• Comparing Bayesian hierarchical meta-regression methods and evaluating the influence of priors for evaluations of surrogate endpoints on heterogeneous collections of clinical trials. BMC Med Res Methodol. 2024 02 16; 24(1):39.. View in PubMed
• Handling missing within-study correlations in the evaluation of surrogate endpoints. Stat Med. 2023 11 20; 42(26):4738-4762.. View in PubMed
• A meta-analysis of GFR slope as a surrogate endpoint for kidney failure. Nat Med. 2023 07; 29(7):1867-1876.. View in PubMed
• Change in Albuminuria and GFR Slope as Joint Surrogate End Points for Kidney Failure: Implications for Phase 2 Clinical Trials in CKD. J Am Soc Nephrol. 2023 06 01; 34(6):955-968.. View in PubMed
• Evaluation of Variation in the Performance of GFR Slope as a Surrogate End Point for Kidney Failure in Clinical Trials that Differ by Severity of CKD. Clin J Am Soc Nephrol. 2023 02 01; 18(2):183-192.. View in PubMed
• Characteristics of Nonelderly Adult Health Care Persistent Super Utilizers in Utah. Popul Health Manag. 2022 08; 25(4):472-479.. View in PubMed
• Patient-reported opioid use for tissue expander-based breast reconstruction. J Plast Reconstr Aesthet Surg. 2021 Nov; 74(11):2899-2905.. View in PubMed
• The Rate of Infectious Complications After Intrathecal Drug Delivery System Implant for Cancer-Related Pain Is Low Despite Frequent Concurrent Anticancer Treatment or Leukopenia. Anesth Analg. 2020 07; 131(1):280-287.. View in PubMed
• A Nationwide Analysis of Early and Late Readmissions following Free Tissue Transfer for Breast Reconstruction. J Reconstr Microsurg. 2020 Jul; 36(6):450-457.. View in PubMed
• A Comparison of Common Plastic Surgery Operations Using the NSQIP and TOPS Databases. Plast Reconstr Surg Glob Open. 2020 May; 8(5):e2841.. View in PubMed
• 2011 ACGME Duty Hour Limits had No Association With Breast Reconstruction Complications. J Surg Res. 2020 03; 247:469-478.. View in PubMed
• Examining the relationship between epidural steroid injections and patient satisfaction. Spine J. 2020 02; 20(2):207-212.. View in PubMed
• Are 30-Day Outcomes Enough? Late Infectious Readmissions following Prosthetic-Based Breast Reconstruction. Plast Reconstr Surg. 2019 09; 144(3):360e-368e.. View in PubMed
• Direct Comparison of Patient-completed and Physician-completed Caprini Scores for Plastic Surgery Patients. Plast Reconstr Surg Glob Open. 2019 Aug; 7(8):e2363.. View in PubMed
• A national analysis of readmissions for wound healing complications following the repair of lower back, hip, and buttock pressure ulcers using the Nationwide Readmissions Database. Am J Surg. 2019 04; 217(4):658-663.. View in PubMed

• Papadopoulos, Vassilios
• Demetriades, Demetrios