RecruitingDrug trialRepotrectinib Post-Marketing Surveillance in Pediatric Patients With NTRK Fusion-Positive Tumors in JapanThis study will collect safety information during routine medical care for children and adolescents in Japan who have been diagnosed with NTRK fusion-positive advanced or recurrent solid tumors who start treatment with repotrectinib. The study will describe how often side effects occur during treatment, with special attention to central nervous system disorders, interstitial lung disease, and fractures.