Open Access

Application of PD‑L1 blockade in refractory histiocytic sarcoma: A case report

  • Authors:
    • Osamu Imataki
    • Makiko Uemura
    • Haruyuki Fujita
    • Norimitsu Kadowaki
  • View Affiliations

  • Published online on: July 15, 2022     https://doi.org/10.3892/mco.2022.2569
  • Article Number: 136
  • Copyright: © Imataki et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

Metrics: Total Views: 0 (Spandidos Publications: | PMC Statistics: )
Total PDF Downloads: 0 (Spandidos Publications: | PMC Statistics: )


Abstract

Histiocytic sarcoma (HS) is a rare hematological malignancy, which exhibits morphological and immunophenotypic features of histiocytes. A standard therapy for HS has not yet been established due to its rareness; therefore, disease control is not always possible. A multimodal treatment strategy has been suggested for HS. The present study reported on a case of a 43‑year‑old female patient who complained of left femoral pain, which was caused by left femoral bone mass. A biopsy of their left femoral bone tumor revealed that the patient had HS. Their sarcoma was localized in the femoral bone and was not considered to be curable, due to local infiltration of the bone tumor beyond the periosteum. The patient then underwent two types of HS‑specific chemotherapy; however, both regimens were ineffective. As a result, they underwent radiation therapy at the sites of progressive disease. Because the HS cells of the patient expressed PD‑L1, they were treated with nivolumab (240 mg/body, biweekly) for residual diseases in the right occipital bone, multiple lung nodules, intrapelvic right lymph node and primary site. Nivolumab treatment resulted in a complete response at all sites, with the exception of the primary site, which was confirmed by 18F‑fluorodeoxyglucose‑positron emission tomography/computed tomography. The patient received additional nivolumab treatment as consolidation therapy for 1 year. In addition, residual disease of the femoral head was completely resected. The surgically resected refractory tumor revealed the tumor cells no longer pathologically expressed PD‑L1 . In conclusion, for refractory and recurrent HS in which surgical resection is not appropriate, treatment with immune‑checkpoint inhibitors, such as nivolumab, may be considered an optional but promising immunotherapy if the tumor histologically expresses PD‑L1. The present study detected one of the refractory mechanisms of ICI treatment.
View Figures
View References

Related Articles

Journal Cover

September-2022
Volume 17 Issue 3

Print ISSN: 2049-9450
Online ISSN:2049-9469

Sign up for eToc alerts

Recommend to Library

Copy and paste a formatted citation
x
Spandidos Publications style
Imataki O, Uemura M, Fujita H and Kadowaki N: Application of PD‑L1 blockade in refractory histiocytic sarcoma: A case report. Mol Clin Oncol 17: 136, 2022
APA
Imataki, O., Uemura, M., Fujita, H., & Kadowaki, N. (2022). Application of PD‑L1 blockade in refractory histiocytic sarcoma: A case report. Molecular and Clinical Oncology, 17, 136. https://doi.org/10.3892/mco.2022.2569
MLA
Imataki, O., Uemura, M., Fujita, H., Kadowaki, N."Application of PD‑L1 blockade in refractory histiocytic sarcoma: A case report". Molecular and Clinical Oncology 17.3 (2022): 136.
Chicago
Imataki, O., Uemura, M., Fujita, H., Kadowaki, N."Application of PD‑L1 blockade in refractory histiocytic sarcoma: A case report". Molecular and Clinical Oncology 17, no. 3 (2022): 136. https://doi.org/10.3892/mco.2022.2569