{Reference Type}: Journal Article {Title}: Lessons learned from the application of the HEcoPerMed guidance to three modeling case studies. {Author}: Nagy B;Zelei T;Vellekoop H;Huygens S;Versteegh M;Mölken MR;Koleva-Kolarova R;Tsiachristas A;Wordsworth S;Szilberhorn L; {Journal}: Per Med {Volume}: 20 {Issue}: 4 {Year}: 2023 Jul 11 {Factor}: 2.119 {DOI}: 10.2217/pme-2023-0040 {Abstract}: Background: The HEcoPerMed consortium developed a methodological guidance for the harmonization and improvement of economic evaluations in personalized medicine. Materials & methods: In three therapeutic areas, health economic models were developed to scrutinize the recommendations of the guidance. Results: Altogether, 20 of the 23 recommendations of the guidance were addressed by the models. Seven recommendations were applied in all studies, six in two of the studies and seven in one of the studies. Recommendations with an essential role on the final conclusions of the analyses were identified in each study. Conclusion: The guidance was found to be best used as a tool to identify and prioritize issues, verify solutions and justify decisions during the economic analysis of personalized interventions.