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Table 2 Summary of studies identifying new therapeutic targets for immunotherapy revealed by scRNA-seq

From: Single-cell RNA sequencing in cancer research: discovering novel biomarkers and therapeutic targets for immune checkpoint blockade

Cancer types

Cell types

Therapeutic targets

Effects

Therapeutic approach

Mechanisms

Ref.

Melanoma

Cancer cells

CDK4/6

Pro-tumor

CDK4/6 inhibitor (palbociclib

and abemaciclib)

Cancer cell immune evasion and T cell exclusion

[132]

TNBC

Cancer cells

MUC1-C

Pro-tumor

MUC1-C inhibitor GO-203

Depletion and dysfunction of CD8+ T cells

[144]

PDAC

Cancer cells

SLC4A4

Pro-tumor

SLC4A4 inhibitor DIDS

A bicarbonate transporter increasing TME acidity

[133]

NPC

Cancer cells

CD70

Pro-tumor

Anti-CD70 antibody cusatuzumab

Promoting the suppressive function of Tregs via the CD70-CD27 axis

[143]

Melanoma

CD8+ T cells

NKG7

Anti-tumor

NKG7 mRNA transfection

Cytotoxic function in CD8+ T cells

[137]

COAD and RCC

CD8+ T cells

GITR

Anti-tumor

Agonist anti-GITR antibody

A costimulatory receptor

[145]

Melanoma and sarcoma

CD8+ T cells, CD4+ T cells

BHLHE40

Anti-tumor

–

A transcription factor required for effective ICB therapy

[146]

Glioma

Cancer cells/myeloid cells – CD8+ T cells

CLEC2D/CD161

Pro-tumor

Anti-CD161 antibody HP-3G10

Suppressing cytotoxicity and cytokine secretion of T cells

[147]

LR-CHL

CD4+ helper T cells – B cells

CXCL13/CXCR5

Pro-tumor

–

Preventing B cell activation and maturation

[148]

Ovarian cancer

NK cells, CD8+ T cells

BRD1

Pro-tumor

BRD1 inhibitor BAY-299

Negatively regulating the activity of T cells and NK cells

[149]

Multiple cancers

NK cells

HIF-1α

Pro-tumor

HIF-1α inhibitor

A transcription factor inhibiting the activation of NK cells

[150]

Multiple myeloma

NK cells

ZNF683

Pro-tumor

–

A transcription factor regulating NK cell exhaustion

[151]

Multiple cancers

CD4+ Tregs

CCR8

Pro-tumor

ADCC-prone anti-CCR8 nanobody

A marker induced by Treg activation

[152]

Multiple cancers

CD4+ Tregs

CD177

Pro-tumor

Anti-CD177 antibody MEM166

Mediating immune suppressive function of Tregs

[153]

ICC

CD4+ Tregs

MEOX1

Pro-tumor

–

A transcription factor regulating Treg hyperactivation

[135]

PDAC

T cells – cancer cells

CCL5/SDC1

Pro-tumor

–

Promoting tumor cell migration

[154]

Glioma

TAMs, CD4+ Tregs, CD8+ T cells

S100A4

Pro-tumor

–

A small calcium-binding protein related to immunosuppression

[134]

Multiple cancers

TAMs

TREM2

Pro-tumor

Anti-TREM2 monoclonal antibody

Associated with immunosuppression

[138]

Multiple cancers

TAMs

APOE

Pro-tumor

APOE inhibitor COG 133TFA

An oncomarker of TAMs associated with M2-TAMs recruitment

[139]

HCC

TAMs

SPP1

Pro-tumor

Anti-SPP1 monoclonal antibody

Inducing the formation of tumor immune barrier by interacting with CAFs

[155]

HCC

TAMs

PPT1

Pro-tumor

PPT1 inhibitor DC661

Associated with the immunosuppressive TME

[156]

GBM

TAMs

Siglec-9

Pro-tumor

–

Inhibiting the activation of CD8+ and CD4+ T cells

[157]

RCC

TAMs – cancer cells

IL-1β/IL-1R1

Pro-tumor

Anti-IL1β antibody

Mediating adaptive myeloid resistance and cancer cell EMT

[158, 159]

PDAC

CAFs

HIF2

Pro-tumor

HIF2 inhibitor PT2399

Mediating immunosuppression in the TME

[160]

reRCC

CAFs

Gal1

Pro-tumor

Gal1 inhibitor OTX008

An immunosuppressive factor triggering T cell apoptosis

[161]

HCC

CAFs

CD36

Pro-tumor

CD36 inhibitor sulfo-N-succinimidyl oleate (SSO)

Recruiting MDSCs to increase immunosuppression of the TME

[162]

ICC

CD146+ vCAFs – cancer cells

IL-6/IL-6R

Pro-tumor

IL-6R neutralizing antibody or IL-6/IL-6R signaling inhibitor

Enhancing ICC malignancy

[84]

Prostate cancer

Arterial TECs – tip TECs

CXCL12/CXCR4

Pro-tumor

CXCR4 inhibitor AMD3100

Triggering neovascularization

[142]

mUC and mRCC

Multiple cells

CXCL8/CXCR2

Pro-tumor

–

Cancer cell growth and metastasis

[136]

CRC

Multiple cells

CD73

Pro-tumor

CD73 inhibitor AB680

A checkpoint enzyme converting extracellular ATP to immunosuppressive adenosine

[140]

Melanoma and myeloma

Multiple cells

GCN2

Pro-tumor

GCN2 inhibitor GCN2iB

Suppressing inflammatory macrophage polarization and promoting cancer cell survival

[163, 164]

Bladder cancer

Multiple cells

CD39

Pro-tumor

CD39 inhibitor sodium polyoxotungstate

Associated with immunosuppression

[141]

Multiple cancers

Multiple cells

IGSF9

Pro-tumor

Anti-IGSF9 antibody

Suppressing T cell activation

[165]

  1. CDK4/6, cyclin-dependent kinase 4/6; TNBC, triple-negative breast cancer; MUC1-C, mucin 1-C type protein; PDAC, pancreatic ductal adenocarcinoma; SLC4A4, solute carrier family 4 member 4; DIDS, 4,4′-diisothiocyano-2,2′-stilbenedisulfonic acid; TME, tumor microenvironment; NPC, nasopharyngeal carcinoma; Tregs, regulatory T cells; NKG7, natural killer cell granule protein-7; COAD, colon adenocarcinoma; RCC, renal cell carcinoma; GITR, glucocorticoid-induced tumor necrosis factor receptor-related protein; BHLHE40, basic helix-loop-helix family member E40; ICB, immune checkpoint blockade; CLEC2D, C-type lectin domain family 2 member D; LR-CHL, lymphocyte-rich classic Hodgkin lymphoma; CXCL13, C-X-C motif chemokine ligand 13; CXCR5, C-X-C chemokine receptor type 5; NK cells, natural killer cells; BRD1, bromodomain-containing protein 1; HIF-1α, hypoxia inducible factor 1 subunit alpha; ZNF683, zinc finger protein 683; CCR8, CC chemokine receptor 8; ADCC, antibody-dependent cell-mediated cytotoxicity; ICC, intrahepatic cholangiocarcinoma; MEOX1, mesenchyme homeobox 1; CCL5, C-C motif chemokine ligand 5; SDC1, syndecan-1; TAMs, tumor-associated macrophages; S100A4, S100 calcium-binding protein A4; TREM2, triggering receptor expressed on myeloid cells 2; APOE, apoprotein E; HCC, hepatocellular carcinoma; SPP1, secreted phosphoprotein 1; PPT1, palmitoylprotein thioesterase 1; GBM, glioblastoma; Siglec-9, sialic acid-binding Ig-like lectin 9; IL-1β, interleukin-1 beta; IL-1R1, interleukin-1 receptor type 1; EMT, epithelial-mesenchymal transition; CAFs, cancer-associated fibroblasts; HIF2, hypoxia-inducible factor-2; reRCC, recurrent renal cell carcinoma; Gal1, Galectin-1; MDSCs, myeloid-derived suppressor cells; IL-6, interleukin-6; IL-6R, IL-6 receptor; TECs, tumor endothelial cells; CXCL12, C-X-C motif chemokine ligand 12; CXCR4, C-X-C chemokine receptor type 4; mUC, metastatic urothelial carcinoma; mRCC, metastatic renal cell carcinoma; CXCL8, C-X-C motif chemokine ligand 8; CXCR2, C-X-C chemokine receptor type 2; CRC, colorectal cancer; GCN2, general control nonderepressible 2; IGSF9, immunoglobulin superfamily member 9