This study examines romiplostim, a medicine that may help increase platelet counts in kids and teens with cancer. When children undergo chemotherapy (a type of cancer treatment), they sometimes get thrombocytopenia, which means they have a low platelet count. Platelets are tiny blood cells that help your body stop bleeding. Low platelet counts can delay cancer treatments or require blood transfusions.

Romiplostim might help raise these counts so treatments can continue without delays. This study checks if romiplostim is safe and works well. To join, patients must be aged 1 to 18 and have a type of cancer called a solid malignancy. They must also have low platelet levels due to chemotherapy, meeting certain criteria.

• Study duration: Participants will be monitored during their chemotherapy cycles.
• Compensation: Information not provided, check with the study team.
• Risks: Check with a doctor, especially if there are other health issues.

Exclusions include having another cancer type, liver cancer, or past certain blood issues.