CAMPFIRE: A Study of Ramucirumab (LY3009806) in Children and Young Adults With Desmoplastic Small Round Cell Tumor

This study is being conducted to test the safety and efficacy of ramucirumab in combination with other chemotherapy in the treatment of relapsed, recurrent, or refractory desmoplastic small round cell tumor (DSRCT) in children and young adults. This trial is part of the CAMPFIRE master protocol (NCT05999994) which is a platform to accelerate the development of new treatments for pediatric and young adult participants with cancer. Your participation in this trial could last 12 months or longer, depending on how you and your tumor respond.

Inclusion Criteria: * Participants must have discontinued all previous treatments for cancer or investigational agents ≥7 days after the last dose or per the type of previous treatment as stated in the protocol and must have recovered from the acute effects to ≤Grade 2 for alopecia and decreased tendon reflex and to ≤Grade 1 for all other effects at the time of enrollment, unless otherwise noted. Consult with the Lilly clinical research physician or scientist for the appropriate length of time prior to the first dose of study treatment. * Participants with relapsed, recurrent, or refractory DSRCT. * Participants must: * Have measurable disease by Response Evaluation Criteria in Solid Tumors, Version (RECIST) 1.1. * Have received at least one prior line of systemic treatment (including neoadjuvant and adjuvant chemotherapy). This prior treatment must include approved therapies for which they are eligible, unless the participant is not a suitable candidate for the approved therapy. * Not be eligible for surgical resection at time of enrollment. * Adequate cardiac function, defined as: Shortening fraction of ≥27% by echocardiogram, or ejection fraction of ≥50% by gated radionuclide study. * Adequate blood pressure (BP) control, defined as: * Participants ≥18 years: Controlled hypertension defined as systolic BP ≤150 millimeters of mercury (mmHg) or diastolic BP ≤90 mmHg where standard medical management is permitted. Please note that ≥2 serial BP readings should be obtained and averaged to determine baseline BP. * Participants \