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Ribeiro MF, Demicco EG, Razak ARA. Clinical activity of pembrolizumab in refractory MDM2-amplified advanced intimal sarcomas. Ther Adv Med Oncol 2024; 16:17588359241250158. [PMID: 38745586 PMCID: PMC11092541 DOI: 10.1177/17588359241250158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2024] [Accepted: 04/10/2024] [Indexed: 05/16/2024] Open
Abstract
Intimal sarcoma (InS) is an ultra-rare and aggressive subtype of soft tissue sarcoma (STS). It usually arises in large mediastinal arteries and the heart. In the advanced setting, sequential cytotoxic chemotherapy is often used, mainly based on retrospective studies and case series but with modest benefit. The use of immune checkpoint inhibitors is a promising strategy for some STS, but identifying biomarkers of response remains challenging due to disease rarity and heterogeneity. A reactive and pro-inflammatory tumor microenvironment (TME) is believed to be associated with better outcomes for patients receiving anti-PD-1-based regimens, generating the rationale to explore this strategy in malignancies with this characteristic, such as InS. We report three cases of advanced InS patients experiencing partial response to pembrolizumab-based therapy despite low tumor mutational burden and absence of mismatch-repair deficiency. We hypothesize that TME-related characteristics such as PD-L1 expression and the presence of tertiary lymphoid structures might explain this phenomenon.
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Affiliation(s)
- Mauricio Fernando Ribeiro
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University of Toronto, Toronto, ON, Canada
| | - Elizabeth G. Demicco
- Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | - Albiruni Ryan Abdul Razak
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University of Toronto, Suit 6-445.13, 600 University Avenue, Toronto, ON M5G 1X5, Canada
- Division of Medical Oncology, Mount Sinai Hospital, University of Toronto, Toronto, ON, Canada
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Shehata MS, Lofftus SY, Park JY, Singh AS, Federman NC, Eilber FC, Crompton JG, McCaw TR. Sarcoma in patients with Lynch syndrome and response to immunotherapy. J Surg Oncol 2024; 129:820-826. [PMID: 38151827 DOI: 10.1002/jso.27567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 11/16/2023] [Accepted: 12/11/2023] [Indexed: 12/29/2023]
Abstract
BACKGROUND Lynch syndrome (LS) is an autosomal dominant genetic predisposition to multiple malignancies and is characterized by deficient DNA mismatch repair. Increased incidence of sarcomas is not formally ascribed to LS; however, increasing evidence suggests a preponderance of these malignancies in affected families. Sarcomas typically possess a low tumor mutational burden and incite a poor immune infiltrate, thereby rendering them poorly responsive to immunotherapy. METHODS We searched the University of California, Los Angeles (UCLA) sarcoma program database for patients with a diagnosis of sarcoma and LS from 2016 to 2023. Three such patients were identified and all three were treated with PD1 blockade. RESULTS We present three cases of LS-associated sarcomas (two soft tissue sarcoma and one osteosarcoma) with increased tumor mutational burdens. These patients were each treated with an anti-PD1 antibody and experienced a response far superior to that reported for non-LS-associated sarcomas. CONCLUSIONS Increased mutational burden and immune infiltrate are observed for sarcomas associated with LS. Although unselected patients with sarcoma have demonstrated poor response rates to immunotherapy, our findings suggest that patients with Lynch-associated sarcomas are more likely to respond to treatment with anti-PD1. These patients should be given consideration for immunotherapy.
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Affiliation(s)
- Michael S Shehata
- Division of Surgical Oncology, Department of Surgery, University of California, Los Angeles, Los Angeles, California, USA
| | - Serena Y Lofftus
- Division of Surgical Oncology, Department of Surgery, University of California, Los Angeles, Los Angeles, California, USA
| | - Joon Y Park
- Division of Surgical Oncology, Department of Surgery, University of California, Los Angeles, Los Angeles, California, USA
| | - Arun S Singh
- Division of Hematology-Oncology, University of California, Los Angeles, Santa Monica, California, USA
- Jonsson Comprehensive Cancer Center, University of California, Los Angeles, Los Angeles, California, USA
| | - Noah C Federman
- Jonsson Comprehensive Cancer Center, University of California, Los Angeles, Los Angeles, California, USA
- Department of Pediatrics, University of California, Los Angeles, Los Angeles, California, USA
| | - Fritz C Eilber
- Division of Surgical Oncology, Department of Surgery, University of California, Los Angeles, Los Angeles, California, USA
- Jonsson Comprehensive Cancer Center, University of California, Los Angeles, Los Angeles, California, USA
| | - Joseph G Crompton
- Division of Surgical Oncology, Department of Surgery, University of California, Los Angeles, Los Angeles, California, USA
- Jonsson Comprehensive Cancer Center, University of California, Los Angeles, Los Angeles, California, USA
| | - Tyler R McCaw
- Division of Surgical Oncology, Department of Surgery, University of California, Los Angeles, Los Angeles, California, USA
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