What is the clinical evidence from this study?

Study design: Observational. Population: Retroperitoneal dedifferentiated liposarcoma (DDLPS) (n=3). Intervention: C3+ malignant cell subpopulations. Primary outcome: Cellular composition and intercellular communication within the tumor microenvironment.

What question did this study set out to answer?

To characterize the cellular heterogeneity and immune microenvironment of retroperitoneal dedifferentiated liposarcoma (DDLPS) using single-cell transcriptomics.

August 15, 2026BMC CancerOpen Access

Single-cell analysis reveals the potential immunoregulatory role of C3 + malignant cell subpopulations in dedifferentiated liposarcoma

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Key result

C3+ malignant cells potentially foster liposarcoma immunosuppression via C3-C3aR1 axis recruitment of T cells and macrophages.

Why the study?

Dedifferentiated liposarcoma exhibits resistance to radiotherapy and chemotherapy, and few reports have analyzed the tumor microenvironment of retroperitoneal undifferentiated liposarcoma using single-cell sequencing.

Population

Three retroperitoneal DDLPS cases

Design

Single-cell sequencing analysis

Authors

SHShengyun HuFirst Affiliated Hospital of Zhengzhou University YDYatong DangFirst Affiliated Hospital of Zhengzhou University BTBaojing TuoFirst Affiliated Hospital of Zhengzhou University

Discussion

Member takes

Implication

Should not yet change practice; leaves open C3-C3aR1 targeting to reverse immunosuppression in DDLPS.

Key Points

To characterize the cellular heterogeneity and immune microenvironment of retroperitoneal dedifferentiated liposarcoma (DDLPS) using single-cell transcriptomics.
Conducted single-cell RNA sequencing on retroperitoneal tumor specimens obtained from 3 cases of dedifferentiated liposarcoma.
Profiled malignant cell subpopulations, copy number variations, immune infiltration states, and receptor-ligand interactions across the tumor microenvironment.
Identified frequent chromosome 6 deletions across heterogeneous malignant cell subclusters, with pathway analyses linking these deletions to reduced tumor immunogenicity.
Demonstrated a coexisting continuum of CD8+ T-cell cytotoxicity transitioning toward an exhausted functional phenotype.
Characterized a distinct C3+ malignant cell subpopulation driving angiogenesis and extracellular matrix remodeling, which recruited IL2RA+ regulatory T cells and SPP1+ macrophages via the C3-C3aR1 signaling axis.

Study Design

Type

Observational (n=3)

PICO

Population

3 patients with surgically resected retroperitoneal dedifferentiated liposarcoma whose tumor tissues underwent single-cell RNA sequencing.

Exposure / Comparator

C3+ malignant cell subpopulations

Primary Outcome

Cellular composition and intercellular communication within the tumor microenvironment

Limitations

Small sample size of only three patients
Associations regarding genomic alterations and immune evasion require further experimental validation
The specific function of the complement system in DDLPS remains unclear and requires further study

Cite This Study

Hu et al. (2026) conducted an observational in Retroperitoneal dedifferentiated liposarcoma (DDLPS) (n=3). C3+ malignant cell subpopulations was evaluated on Cellular composition and intercellular communication within the tumor microenvironment. C3+ malignant cells in dedifferentiated liposarcoma potentially foster an immunosuppressive microenvironment by recruiting IL2RA+ regulatory T cells and SPP1+ macrophages through the C3-C3aR1 axis.

synapsesocial.com/papers/6a801a0e75c2e31742c867ec https://doi.org/10.1186/s12885-026-16750-4

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