Chemoradiotherapy & ImmunotherapyChemoradiotherapy With Targeted Immunotherapy in Pediatric Lymphoma

Mature B-cell Non-hodgkin Lymphoma \[MB NHL\], GROUP B will receive reduction therapy with dexamethasone, vincristine and cyclophosphamide (DOC), then undergo disease assessment. If tumor reduction ≥ 20%, will get induction 1 and 2 with polatuzumab vedotin, cyclophosphamide, vincristine, methotrexate, rituximab, doxorubicin (Pv-COM3RA25D) 1 and 2, then Consolidation 1 with rituximab, cytarabine, methotrexate (R-CYM) . Patients will undergo disease assessment post Consolidation 1. If no residual disease, they proceed to receive Consolidation 2 with Pv-R-CYM (R-CYM 2).

Cohort Ia patients with < 20% tumor reduction post DOC will be assigned to Cohort Ib starting at Induction 1. Cohort Ia patients with residual disease post Consolidation 1 will be assigned to Cohort Ib starting at Consolidation 1 polatuzumab vedotin, rituximab, high dose cytarabine, cytarabine, high dose methotrexate, etoposide (Pv-R-CYVE 1).

MB NHL, GROUP C will receive reduction therapy with DOC. Patients with < 20% tumor reduction will be off protocol. Patients with ≥ 20% tumor reduction get Induction 1 and 2 with cyclophosphamide, doxorubicin, dexamethasone, high dose methotrexate, polatuzumab vedotin, and triple intrathecal chemotherapy (M8A30D CPR) 1 and 2, then Consolidation 1 with Pv-R-CYVE 1. If no residual disease, they get Consolidation 2 (Pv-R-CYVE 2), followed by Maintenance (M) 1 with M8A30D CP, M 2 with Pv-cytarabine/etoposide, M 3 with cyclophosphamide, doxorubicin, dexamethasone and polatuzumab vedotin (A30D CP), and M 4 with Pv-cytarabine/etoposide. Cohort Ib patients with CNS disease will receive additional intrathecal chemotherapy and high dose methotrexate during Consolidation.

Classical Hodgkin lymphoma, INTERMEDIATE RISK will receive 2 cycles of brentuximab vedotin (Bv), doxorubicin, vinblastine, dactinomycin, and rituximab (Bv-AVD-R 1 and 2). Response assessment with FDG-PET scan after 2 cycles of Bv-AVD-R. Rapid early responders (RER) will continue therapy with 2 cycles of Bv, vinblastine, dactinomycin, nivolumab, and rituximab (Bv-NVD-R 1 and 2). RERs will not receive radiation therapy. Patients deemed to be Slow Early Responders (SER) after 2 cycles of Bv-AVD-R will continue therapy with 4 cycles of Bv-NVD-R (Bv-NVD-R 1, 2, 3, and 4). Radiation therapy will be given at completion of therapy only for SER patients NOT achieving complete remission at the end of chemoimmunotherapy.

COHORT IIb (Classical Hodgkin lymphoma, HIGH RISK) Cohort IIb patients will receive 2 cycles of brentuximab vedotin (Bv), doxorubicin, vinblastine, dactinomycin, and rituximab (Bv-AVD-R 1 and 2). Response assessment will be performed with FDG-PET scan after 2 cycles of Bv-AVD-R. Rapid early responders (RER) will continue therapy with 4 cycles of Bv, vinblastine, dactinomycin, nivolumab, and rituximab (Bv-NVD-R 1, 2, 3, and 4). RERs will not receive radiation therapy. Patients deemed to be Slow Early Responders (SER) after 2 cycles of Bv-AVD-R will receive 2 cycles of Bv, nivolumab, doxorubicin, vinblastine, dactinomycin, and rituximab (Bv-NAVD-R 1 and 2), followed by 4 cycles of Bv, vinblastine, dactinomycin, nivolumab, and rituximab (Bv-NVD-R 1, 2, 3, and 4). Radiation therapy will be given at completion of therapy only for SER patients NOT achieving complete remission at the end of chemoimmunotherapy.

Cyclophosphamide 300 mg x1; dexamethasone x 7; vincristine x1

polatuzumab vedotin x1; dexamethasone x 5; vincristine x1, cyclophosphamide x 3; doxorubicin x1; methotrexate x; rituximab 2x; ITT x1

polatuzumab vedotin x 1; methotrexate x 1; rituximab x 1; cytarabine x 5;

cyclophosphamide x 1, dexamethasone x 5; vincristine x1; IT triples x 3

methotrexate x 1; dexamethasone x 5; polatuzumab Vedotin x 1, cyclophosphamide x 3; doxorubicin x 1; rituximab x2; IT triples x 2 in induction 1, IT triples x 2 in induction 2

Polatuzumab Vedotin x 1; Rituximab x 1; Cytarabine x 5; Etoposide x4;

Polatuzumab Vedotin x 1; Rituximab x 1; Cytarabine x 5; Etoposide x4; high dose cytarabine x4; high dose methotrexate x 1 (only consolidation 1); IT triples x 2 (only 1 in consolidation 2)

dexamethasone x1; polatuzumab vedotin x 1; cyclophosphamide x 2; doxorubicin x 1; high dose methotrexate x 1; IT triples x 1

polatuzumab vedotin x 1; cytarabine x 5; etoposide x 3;

polatuzumab vedotin x 1; cyclophosphamide x2; doxorubicin x 2;

brentuximab vedotin x 2; doxorubicin x 2; vinblastine x 2; dacarbazine 2x; rituximab x 2

brentuximab vedotin x 2; nivolumab x 2; vinblastine x2; dacarbazine x 2; rituximab x 2;

brentuximab vedotin x 2; nivolumab x 2; vinblastine x 2; rituximab x 2;

Brentuximab vedotin x2; doxorubicin x2; vinblastine x 2; dacarbazine x 2; rituximab x2;

brentuximab vedotin x 2; nivolumab x 2; vinblastine x 2; dacarbazine x 2; rituximab x 2;

brentuximab vedotin x 2; nivolumab x 2; doxorubicin x 2; vinblastine x 2; dacarbazine x 2; rituximab x 2;

21 Gy in 14 fractions of 1.50 Gy per day. The treatment will be given 5 days per week. All fields shall be treated once each day. The total elapsed treatment time will be 2.8 weeks (14 sessions) for each field.