This study is researching an experimental drug called odronextamab, referred to as study
drug. The study is focused on participants with previously untreated follicular lymphoma (a
type of non-Hodgkin lymphoma or NHL).

This study will be made up of two parts: Part 1 (non-randomized) and Part 2 (randomized -
controlled). The aim of Part 1 of the study is to see how safe and tolerable the study drug
is. The aim of Part 2 of the study is to see how the study drug works compared to rituximab
and chemotherapy (the current standard of care for NHL). Standard of care means the usual
medication expected and used when receiving treatment for a condition.

The study is looking at several other research questions, including:

- What side effects may happen from taking the study drug

- How much study drug is in your blood at different times

- Whether the body makes antibodies against the study drug (which could make the drug less
effective or could lead to side effects)

- The impact from the study drug on your quality of life and ability to complete routine
daily activities.

This phase III trial tests how well adding dinutuximab to induction chemotherapy along with standard of care surgery radiation and stem cell transplantation works for treating children with newly diagnosed high risk neuroblastoma. Dinutuximab is a monoclonal antibody that binds to a molecule called GD2, which is found in greater than normal amounts on some types of cancer cells. This helps cells of the immune system kill the cancer cells. Chemotherapy drugs such as cyclophosphamide, topotecan, cisplatin, etoposide, vincristine, dexrazoxane, doxorubicin, temozolomide, irinotecan and isotretinoin, work in different ways to stop the growth of cancer cells, either by killing the cells, by stopping them from dividing or by stopping them from spreading. During induction, chemotherapy and surgery are used to kill and remove as much tumor as possible. During consolidation, very high doses of chemotherapy are given to kill any remaining cancer cells. This chemotherapy also destroys healthy bone marrow, where blood cells are made. A stem cell transplant is a procedure that helps the body make new healthy blood cells to replace the blood cells that may have been harmed by the cancer and/or chemotherapy. Radiation therapy is also given to the site where the cancer originated (primary site) and to any other areas that are still active at the end of induction.