Intrathecal chemotherapy in the complex treatment of children with parameningeal rhabdomyosarcoma with intracranial spread and/or leptomeningeal metastasis
https://doi.org/10.21294/1814-4861-2026-25-1-28-45
Abstract
Introduction. Parameningeal rhabdomyosarcoma with intracranial spread is a highly aggressive pediatric malignancy with a high risk of leptomeningeal metastasis. Historically, central nervous system (CNS) involvement was considered an incurable condition with a survival rate of no more than 10–20 %. The bloodbrain barrier is the primary barrier to the penetration of most drugs and the creation of effective concentrations. Therefore, the search for effective and non-toxic methods for controlling leptomeningeal metastases is one of the most pressing challenges in pediatric oncology. Intrathecal chemotherapy (ITCT) delivers cancer drugs directly into the cerebrospinal fuid, bypassing the BBB. It enables high concentrations of medication to directly target cells, reducing systemic toxicity.
The purpose of the study was to evaluate the effcacy and safety of intrathecal chemotherapy in a multidisciplinary approach to the treatment of children with parameningeal rhabdomyosarcoma with intracranial spread and/or leptomeningeal metastasis, and to improve survival rates in this cohort of children.
Material and Methods. The study included 21 patients with a histologically verifed diagnosis of parameningeal rhabdomyosarcoma with intracranial spread and/or leptomeningeal metastasis, who received treatment at the L.A. Durnov Research Institute of Pediatric Oncology and Hematology of the Russian Academy of Medical Sciences from 2021 to 2024. The study was approved by the local ethics committee.
Results. With a 34.3-month median follow-up, the overall 2-year survival rate was 65 %. This indicates the effectiveness of early tumor control by overcoming the blood-brain barrier. The overall 2-year survival rate was signifcantly higher in both the prophylactic and therapeutic frst-line intrathecal chemotherapy groups than in the relapse group (80 % vs 20 %, p<0.05) and signifcantly exceeded the median survival time of 4–6 months reported by other authors [1]. The toxicity profle of ITCT was favorable, with no cases of severe neurotoxicity.
Conclusion. Intensive intrathecal chemotherapy in the combination treatment of children with parameningeal rhabdomyosarcoma with intracranial extension and/or leptomeningeal metastasis is an effective and safe method for treating and preventing CNS tumor cell infltration. This therapy can signifcantly improve survival of patients with extremely unfavorable prognosis.
About the Authors
A. D. RodinaRussian Federation
Anastasia D. Rodina, MD, Researcher, Pediatric Oncologist, Oncology Department No. 3 (Chemotherapy for Head and Neck Tumors), Research Institute of Pediatric Oncology and Hematology named after Academician L.A. Durnov
24, Kashirskoe highway, Moscow, 115478
V. G. Polyakov
Russian Federation
Vladimir G. Polyakov, MD, DSc, Professor, Academician of the Russian Academy of Sciences, Advisor to the Director, Research Institute of Pediatric Oncology and Hematology named after Academician L.A. Durnov; Head of the Department of Pediatric Oncology named after Academician L.A. Durnov; Professor, Department of ENT Diseases of the Pediatric Faculty; Professor, Department of Postgraduate Education for Physicians, Department of Professional Education
24, Kashirskoe highway, Moscow, 115478;
2/1, building 1, Barrikadnaya St., Moscow, 125993;
1, Ostrovityanova St., Moscow, 117997;
24, Kashirskoe highway, Moscow, 115478
A. S. Krylov
Russian Federation
Alexander S. Krylov, MD, PhD, Head of the Radionuclide Diagnostics Department No. 1, Radionuclide Diagnostics and Therapy Department, Research Institute of Clinical and Experimental Radiology
24, Kashirskoe highway, Moscow, 115478
A. L. Kashanina
Russian Federation
Alexandra L. Kashanina, MD, Radiologist, Department of X-ray Diagnostic, Research Institute of Pediatric Oncology and Hematology named after Academician L.A. Durnov
24, Kashirskoe highway, Moscow, 115478
T. V. Gorbunova
Russian Federation
Tatyana V. Gorbunova, MD, PhD, Chief Physician, Research Institute of Pediatric Oncology and Hematology; Senior Researcher, Oncology Department No. 3 (Chemotherapy for Head and Neck Tumors), Research Institute of Pediatric Oncology and Hematology named after Academician L.A. Durnov; Assistant, Department of ENT Diseases, Faculty of Pediatrics; Department of Postgraduate Education for Physicians, Department of Professional Education
24, Kashirskoe highway, Moscow, 115478;
1, Ostrovityanova St., Moscow, 117997;
24, Kashirskoe highway, Moscow, 115478
S. R. Varfolomeeva
Russian Federation
Svetlana R. Varfolomeeva, MD, DSc, Professor, Director, Research Institute of Pediatric Oncology and Hematology named after Academician L.A. Durnov; Professor, Department of Pediatric Oncology named after Academician L.A. Durnov; Professor, Department of Postgraduate Education for Physicians, Department of Professional Education
24, Kashirskoe highway, Moscow, 115478;
2/1, building 1, Barrikadnaya St., Moscow, 125993;
24, Kashirskoe highway, Moscow, 115478
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Supplementary files
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1. Fig. 1. Results of brain tomoscintigrams with 99mTc-pertechnetate of patient P. diagnosed with alveolar parameningeal rhabdomyosarcoma with intracranial extension, leptomeningeal metastases in the brain. Stage IV. T2вN0M1. IRS IVa. Tomograms in axial (a) and frontal (b) projections before starting treatment show focally increased distribution of radiopharmaceuticals in the projection of the primary tumor parameningeally on the left (common nasal meatus, maxillary sinus, left orbit and middle cranial fossa) – red arrows. There are signs of damage to the meninges by contact in the left middle cranial fossa. CT scans after 9 cycles of chemotherapy, 6 cycles of intrathecal chemotherapy, and craniospinal irradiation (total dose: 36 Gy) to the area of the primary tumor (total dose: 50.4 Gy) according to the CWS 2014 protocol (group of metastatic sarcomas) show a slightly increased distribution of the radiopharmaceuticals in the projection of the primary tumor parameningeally on the left in the axial (c) and frontal (d) projections. Compared with the initial study, a marked positive trend is observed. Note: created by the authors | |
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2. Fig. 2. Frequency of tumor metastases to different anatomical sites at the time of diagnosis. Note: created by the authors | |
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3. Fig. 3. Patient R. diagnosed with alveolar parameningeal rhabdomyosarcoma with intracranial spread, lymph node metastases on the right of the neck. Stage -III. T2bN1M0. IRS IIIa. Before starting treatment – tomograms in axial (a) (b) and sagittal (c) projections; after completing treatment – tomograms in axial (d) (e) and sagittal (f) projections. Note: created by the authors | |
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4. Fig. 4. Patient P. diagnosed with embryonal parameningeal rhabdomyosarcoma with intracranial spread, lymph node metastases, leptomeningeal metastases of the spine. Stage IV. T2вN1M1. IRS IVa. Before starting treatment – tomograms in frontal (a), axial (b) and sagittal (c) projections; after completing treatment – tomograms in frontal (d), axial (e) and sagittal (f) projections. Note: created by the authors | |
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5. Fig. 5. Patient T. diagnosed with embryonal parameningeal rhabdomyosarcoma with intracranial spread. Stage – Т2bN0M0 IRSIII. Relapse I. Before starting anti-relapse treatment – tomograms in axial (a), frontal (b) projections; after treatment –tomograms in frontal (d) and sagittal (e) projections, cytological picture (c) (f) of cerebrospinal fluid. Note: created by the authors | |
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6. Fig. 6. Overall 2-year survival rates in patients with parameningeal rhabdomyosarcoma with intracranial spread and/or leptomeningeal metastasis depending on the status of the central nervous system. Note: created by the authors | |
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7. Fig. 7. Overall 2-year survival rates in patients with parameningeal rhabdomyosarcoma with intracranial extension and/or leptomeningeal metastasis. Note: created by the authors | |
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Review
For citations:
Rodina A.D., Polyakov V.G., Krylov A.S., Kashanina A.L., Gorbunova T.V., Varfolomeeva S.R. Intrathecal chemotherapy in the complex treatment of children with parameningeal rhabdomyosarcoma with intracranial spread and/or leptomeningeal metastasis. Siberian journal of oncology. 2026;25(1):28-45. (In Russ.) https://doi.org/10.21294/1814-4861-2026-25-1-28-45
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