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The Challenges of Tumor Mutational Burden as an Immunotherapy Biomarker
Open accessAbstract
Tumor mutational burden (TMB) reflects cancer mutation quantity. Mutations are processed to neo-antigens and presented by major histocompatibility complex (MHC) proteins to T cells. To evade immune eradication, cancers exploit checkpoints that dampen T cell reactivity. Immune checkpoint inhibitors (ICIs) have transformed cancer treatment by enabling T cell reactivation; however, response biomarkers are required, as most patients do not benefit. Higher TMB results in more neo-antigens, increasing chances for T cell recognition, and clinically correlates with better ICI outcomes. Nevertheless, TMB is an imperfect response biomarker. A composite predictor that also includes critical variables, such as MHC and T cell receptor repertoire, is needed.
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“In certain tumour types, the number of neoantigens in a tumour (or tumour mutational burden (TMB)) is correlated with responsiveness to ICIs67,68.”
From Adjuvant and neoadjuvant immunotherapies in hepatocellular carcinoma (2024) · cites this paper as [67]
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Immune checkpoint PTPN2 predicts prognosis and immunotherapy response in human cancers
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Huang, Z., Hu, X., Wei, Y., Lai, Y., Qi, J., Pang, J., Huang, K., Li, H., & Cai, P. (2024) · PLoS ONE · doi:10.1371/journal.pone.0303909 · Cited by 13
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Kwon, W., Lee, S. Y., Jeong, T., Kim, H. C., & Lee, M.-K. (2024) · Cancers · doi:10.3390/cancers16132420 · Cited by 13
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“Supporting this, it has been shown that cancer patients with a high TMB respond better to ICI therapy than patients with a low TMB in various cancers [142,143].”
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“What’s more, it is well known that TMB has been shown to be a potential biomarker for predicting ICI treatment response in many tumor types (Goodman et al., 2017; Jardim et al., 2021), our results revealed that the TMB was slightly higher in the low-risk group than that in the high-risk group, we thought that may part…”
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“Therefore, novel biomarkers which can predict the efficacy of ICIs should be developed in combination with PD-L1 and TMB to correctly assess whether patients can benefit from ICIs treatment [66], thereby improving prognosis and reducing unnecessary drug toxicity in patients who are unlikely to benefit.”
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“As for TMB, the gold detection standard is whole exome sequencing (WES) [30] which is expensive and has a long detection cycle [31].”
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“After removing germline mutations, the total somatic mutations in the tumor genome are known as tumor mutation burden (TMB), which can activate CD8+cytotoxic T cells and initiate T cell-mediated anti-tumor effects (56).”
BackgroundPan-cancer analysis of RNA 5-methylcytosine reader (ALYREF)
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Molecular Landscape and Therapeutic Strategies against Colorectal Cancer
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“TMB refers to the quantity of mutations noted in a tumor sample that, when elevated, is associated with increased neoantigen production and increased T cell infiltration into the tumor microenvironment, which results in increased response to immunotherapy [83].”
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“There is also currently no consensus in the TMB cutoff to be used for patient stratification [81].”
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“Genomic alterations play a crucial role in carcinogenesis, tumor progression, and treatment response (25, 26).”
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“Tumor mutational burden a ff ects the immune response of tumor cells [26].”
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“It has been shown that TMB is positively correlated with the outcome of ICIs treatment for most cancers [6].”
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“However, due to tumor complexity, TMB is not always correlated with ICI responsiveness of ICIs, necessitating TMB interpretation and contextualization refinement [5].”
BackgroundAbate, R. E., Pasquale, R., Sacco, A., Simeon, V., Maiello, M. R., Frezzetti, D., Chiodini, P., & Normanno, N. (2024) · Journal for ImmunoTherapy of Cancer · doi:10.1136/jitc-2023-007800 · Cited by 11
“6 However, this approach is not feasible to translate into clinical routine and multiple companies have developed target sequencing (TS) assays for TMB estimate.”
BackgroundWu, Z., Liu, X., Xie, F., Ma, C., Lam, E. W. ‐., Kang, N., Jin, D., Yan, J., & Jin, B. (2024) · Life Sciences · doi:10.1016/j.lfs.2024.122527 · Cited by 12
Jin, T., Yin, T., Xu, R., Liu, H., Yuan, S., Xue, Y., Zhang, J., & Wang, H. (2024) · Translational Oncology · doi:10.1016/j.tranon.2024.101938 · Cited by 11
“It has been recommended that patients with higher tumor mutational burden (TMB) were more responsive to immunotherapy [31].”
BackgroundCharacterizing and forecasting neoantigens-resulting from MUC mutations in COAD
Chen, M., Zhang, X., Ming, Z., Lingyu, Feng, X., Han, Z., & An, H. (2024) · Journal of Translational Medicine · doi:10.1186/s12967-024-05103-z · Cited by 11
“…factors have been identified for predicting the clinical outcome of immunotherapy, including the tumor mutation burden (TMB) [51], MSI status [7], neoepitope load [52–55], PD-L1 level [55], CD8 + T-cell density [56], interferon-γ gene signature [57], and MHC and T-cell receptor repertoire [58, 59].”
Ding, K., Peng, Z., & Xu, Y. (2024) · Therapeutic Advances in Medical Oncology · doi:10.1177/17588359241249041 · Cited by 12
Tang, S., Zhang, Y., Huang, S., Zhu, T., & Huang, X. (2024) · Frontiers in Immunology · doi:10.3389/fimmu.2024.1427348 · Cited by 11
“CM harbors higher tumor mutation burdens(TMB) and shows good response to immune checkpoint inhibitos(ICIs) (34).”
BackgroundInfluentialNeutrophils in the Focus: Impact on Neuroimmune Dynamics and the Gut–Brain Axis
Kršek, A., & Batičić, L. (2024) · Gastrointestinal Disorders · doi:10.3390/gidisord6030039 · Cited by 13
“The gut microbiota emerges as potential predictive biomarkers and treatment targets, although challenges lie ahead [536].”
BackgroundInfluentialCRISPR–Cas9 potential for identifying novel therapeutic targets in muscle-invasive bladder cancer
Smith, D. J., Lunj, S., Adamson, A. D., Nagarajan, S., Smith, T., Reeves, K. J., Hoskin, P., & Choudhury, A. (2024) · Nature Reviews Urology · doi:10.1038/s41585-024-00901-y · Cited by 11
“Bladder tumours have high tumour mutational burden (TMB) and are therefore ideal candidates for TCR therapies, as the higher the TMB the more neo-antigens are available for targeting, leading to increased therapeutic success 90 .”
Xing, S., Li, D., & Zhao, Q. (2024) · Aging · doi:10.18632/aging.206096 · Cited by 11
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“Nevertheless, there are several challenges for the clinical implementation of TMB, especially in standardizing detection methods and appropriate thresholds by tumor type (30, 31).”
Impact of nanoparticles on immune cells and their potential applications in cancer immunotherapy
Nair, J. B., Joseph, A. M., SANOOP, P., & Joseph, M. M. (2024) · Biocell · doi:10.32604/biocell.2024.054879 · Cited by 11
Copper homeostasis and cuproptosis in gynecological cancers
Huang, X., Lian, M., & Li, C. (2024) · Frontiers in Cell and Developmental Biology · doi:10.3389/fcell.2024.1459183 · Cited by 11
Individualized Neoantigen-Directed Melanoma Therapy
Khaddour, K., & Buchbinder, E. I. (2025) · American Journal of Clinical Dermatology · doi:10.1007/s40257-025-00920-4 · Cited by 13
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“Higher TMB results in more neoantigens, increased T cell recognition, and better ICI therapy outcomes (Jardim et al., 2021).”
BackgroundBu, F., Li, X., Zhao, Y., Bai, L., Zhang, S., & Min, L. (2023) · Biomarker Research · doi:10.1186/s40364-022-00446-5 · Cited by 11
“Correspondently, correlations between genomic stability indicators [6, 7] and NMF subgroups were only identified in a small portion of cancers (9/21 for TMB score, Fig.”
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“Tumor cells achieve an endless evolution according to the external stimulus and exploit immune checkpoints to dampen T-cell reactivity.(1) Based on these findings, immune checkpoint inhibitor (ICI) therapy, emerging to enable T-cell reactivation has brought a breakthrough in the solid tumor treatment.”
BackgroundLncRNA and its role in gastric cancer immunotherapy
Zhang, Q., Wang, C., Yang, Y., Xu, R., & Li, Z. (2023) · Frontiers in Cell and Developmental Biology · doi:10.3389/fcell.2023.1052942 · Cited by 11
“At the molecular level, TMB is associated with deficient mismatch repair (dMMR), high microsatellite instability (MSI-H), and mutations in DNA polymerase correction domains encoding POLE and POLD1 genes (Jardim et al., 2021).”
BackgroundPD-L1 gene amplification and focality: relationship with protein expression
Jardim, D. L. F., Murugesan, K., Elvin, J. A., Huang, R. S. P., & Kurzrock, R. (2023) · Journal for ImmunoTherapy of Cancer · doi:10.1136/jitc-2022-006311 · Cited by 11
Self-citationHan, T., Liu, Y., Wu, J., Bai, Y., Zhou, J., Hu, C., Zhang, W., Guo, J., Wang, Q., & Hu, D. (2023) · Scientific Reports · doi:10.1038/s41598-023-32276-2 · Cited by 11
He, Y., Wu, Y., Song, M., Yang, Y., Yu, Y., & Xu, S. (2023) · Frontiers in Oncology · doi:10.3389/fonc.2023.1149370 · Cited by 11
Feng, D.-C., Wang, J., Shi, X.-B., Li, D.-X., Wei, W.-R., & Han, P. (2023) · European Journal of Medical Research · doi:10.1186/s40001-023-01132-4 · Cited by 10
“In many kinds of tumors, higher TMB means tumor cells carry more tumor antigens, which therefore are more vulnerable to be killed by activated immune cells [95, 96].”
BackgroundHan, Y., Liu, S. M., Jin, R., Meng, W., Wu, Y.-L. L. C., & Li, H. (2023) · Frontiers in Immunology · doi:10.3389/fimmu.2023.1178193 · Cited by 11
Rizzo, A., Cantale, O., Mogavero, A., Garetto, L., Racca, M., Venesio, T., Anpalakhan, S., Novello, S., Gregorc, V., & Banna, G. L. (2023) · Thoracic Cancer · doi:10.1111/1759-7714.15032 · Cited by 11
“Its use is limited in clinical practice due to its high cost and limited specificity and sensitivity.(14) The gut microbiome (GM) has emerged as a prominent predictive biomarker.”
BackgroundYu, S., Tang, L., Zhang, Q., Li, W., Yao, S., Cai, Y., & Cheng, H. (2023) · Hereditas · doi:10.1186/s41065-023-00293-w · Cited by 11
Chen, P., Jiang, Y., Liang, J., Cai, J., Zhuo, Y., Fan, H., Yuan, R., Cheng, S., & Zhang, Y. (2023) · Aging · doi:10.18632/aging.204911 · Cited by 11
“…and the response to ICB therapy, we analyzed the association between SLC1A5 and MSI and TMB. Clinical studies have shown that high MSI or TMB may be associated with sensitivity to immune checkpoint inhibitors, and patients with these characteristics may benefit from immunotherapy [56, 57].”
Li, X., He, Y., Jiang, Y., Pan, B., Wu, J., Zhao, X., Huang, J., Wang, Q., Cheng, L., & Han, J. (2023) · Molecular Therapy — Nucleic Acids · doi:10.1016/j.omtn.2023.09.003 · Cited by 11
“Non-silent mutations are coding sequencing mutations that cause a change in the amino acid sequence of proteins, which are then processed to neoantigens and presented into T cells by the major histocompatibility complex (MHC) protein on the surface of cancer cells, thereby destroying the cancer cells.(45) The genes wi…”
BackgroundQu, H., Mao, M., Wang, K., Mu, Z., & Hu, B. (2023) · Translational research · doi:10.1016/j.trsl.2023.11.003 · Cited by 11
STING signalling compensates for low tumour mutation burden to drive anti-tumour immunity
Tan, J., Egelston, C. A., Guo, W., Stark, J. M., & Lee, P. P. (2024) · EBioMedicine · doi:10.1016/j.ebiom.2024.105035 · Cited by 11
“92,93 Our results suggest that STING pathway related biomarkers may identify additional tumours with low/intermediate TMB that may respond to ICB, as the majority of do not carry high TMB tumours.”
Zhang, J., Li, Y., Dai, W., Tang, F., Wang, L., Wang, Z., Li, S., Ji, Q., 张君红, Liao, Z., et al. (2024) · Cancer Immunology Immunotherapy · doi:10.1007/s00262-024-03657-x · Cited by 11
“The TMB is a promising and clinically validated biomarker for immune checkpoint inhibitors (ICIs) [31].”
BackgroundGuo, W., Jin, L., Liang, J., Lin, G., Zheng, J., Zhou, D., Zhan, S.-Q., Sun, H., & Jiang, X. (2022) · Clinica Chimica Acta · doi:10.1016/j.cca.2022.07.001 · Cited by 10
Pi, Y.-L., Zhan, Y., Song, J.-T., Jin, X., & Chen, J. (2022) · Journal of Gastrointestinal Oncology · doi:10.21037/jgo-22-115 · Cited by 3
“Furthermore, the predictive value of MSI, TMB and neo-antigen for immunotherapy has been demonstrated in a variety of cancers (59-61).”
BackgroundThiopurine 6TG treatment increases tumor immunogenicity and response to immune checkpoint blockade
Nazerai, L., Willis, S. C., Yankilevich, P., Leo, L. D., Bosisio, F. M., Frías, A., Bertolotto, C., Nersting, J., Thastrup, M., Buus, S., et al. (2022) · OncoImmunology · doi:10.1080/2162402x.2022.2158610 · Cited by 10
“Notably, mutations acquired during tumorigenesis can increase the number of neoepitopes on tumor cells and elicit cytotoxic T-cell responses, which can be enhanced by ICI therapy.(7,8) Accordingly, tumor mutational burden (TMB), which is defined as the number of somatic non-synonymous mutations per megabase (mut/Mb) o…”
BackgroundYang, P., Lu, J., Zhang, P., & Zhang, S. (2023) · Diagnostics · doi:10.3390/diagnostics13050870 · Cited by 10
“Recently, multiple pieces of research have illustrated that TMB is closely associated with tumor immune cell infiltration and affects the efficacy of immunotherapy [30,31].”
BackgroundWang, J., Wang, Y., Zhou, J., Cai, M., Guo, P., Du, T., & Zhang, H. (2023) · Journal of Cellular and Molecular Medicine · doi:10.1111/jcmm.17847 · Cited by 9
Li, K., Yang, Y., Ma, M., Lu, S., & Li, J. (2023) · World Journal of Surgical Oncology · doi:10.1186/s12957-023-03090-x · Cited by 10
“TMB reflects cancer mutation quantity [24].”
Liang, Q., Ye, Y., Li, E., Fan, J., Gong, J., Ying, J., Cao, Y., Li, R., & Wang, P. (2023) · Translational Cancer Research · doi:10.21037/tcr-23-217 · Cited by 10
“Mechanistically, higher TMB means a higher number of somatic mutations in cancer, and a greater number of neoantigens increases the likelihood of T-cell recognition, thus improving the antitumor response (45).”
BackgroundZhang, Q., Zhang, J., Liu, Z., Wang, J., Wang, F., Wang, T., Shi, F., Su, J., & Zhao, Y. (2023) · Drug Design Development and Therapy · doi:10.2147/dddt.s429180 · Cited by 10
“24 TMB and MSI are potential biomarkers for predicting response to ICIs because they are closely related to tumor-specific antigens, 26,27 which is important for ICI therapy.”
BackgroundShen, W., Pan, Y., & Zou, S. (2024) · Diagnostic Pathology · doi:10.1186/s13000-023-01415-8 · Cited by 10
“Some established biomarkers include deficient MMR/microsatellite instability-high (MSI-H) [10, 13] and high TMB (> 10 mutations/ megabase) [14, 15].”
BackgroundVHL loss enhances antitumor immunity by activating the anti-viral DNA-sensing pathway
Jiao, M., Hu, M., Pan, D., Liu, X., Bao, X., Kim, J., Li, F., & Li, C. (2024) · iScience · doi:10.1016/j.isci.2024.110285 · Cited by 10
Reveneau, M.-F., Masliah‐Planchon, J., Delgado‐Fernández, M., Ouikene, A., Dron, B., Dadamessi, I., Dayen, C., Golmard, L., & Chauffert, B. (2024) · Frontiers in Oncology · doi:10.3389/fonc.2024.1410322 · Cited by 10
Immune Checkpoint Inhibitors for Pediatric Cancers: Is It Still a Stalemate?
Jaing, T., Wang, Y.-L., & Chiu, C.-C. (2024) · Pharmaceuticals · doi:10.3390/ph17080991 · Cited by 11
“This occurs when crucial genes responsible for maintaining the integrity of DNA replication undergo mutations [72].”
BackgroundDing, X., Zhang, L., Fan, M., & Li, L. (2024) · Briefings in Bioinformatics · doi:10.1093/bib/bbae410 · Cited by 11
“However, given the complexity and dynamic nature of tumor immunity, these biomarkers are not always effective [9–11].”
BackgroundWang, Y., Mou, Y.-K., Liu, W.-C., Wang, H., Song, X., Yang, T., Ren, C., & Song, X. (2024) · Scientific Reports · doi:10.1038/s41598-024-70430-6 · Cited by 10
Li, J., Chen, M., Tong, M., & Cao, Q. (2024) · Frontiers in Immunology · doi:10.3389/fimmu.2024.1457691 · Cited by 10
“Furthermore, TUBA1C is positively correlated with the TMB in ccRCC, indicating that TUBA1C participates in the occurrence and accumulation of mutations related to DNA repair and genome stability, thereby impacting outcomes and immune therapy responses in ccRCC patients (38).”
BackgroundVasseur, D., Bigot, L., Beshiri, K., Arango, J. D. F., Facchinetti, F., Hollebecque, A., Tselikas, L., Aldea, M. D., Blanc‐Durand, F., Gazzah, A., et al. (2024) · Molecular Cancer · doi:10.1186/s12943-024-02134-4 · Cited by 10
“Certain indicators, such as PD-L1 status [1], tumor mutational burden [2], and mismatch repair deficiency [3], offer partial predictive value for responses to immune checkpoint inhibitors.”
Prospects and challenges of neoantigen applications in oncology
Shi, R., Ran, L., Tian, Y., Guo, W., Zhao, L., Jin, S., Cheng, J., Zhang, Z., & Ma, Y. C. (2024) · International Immunopharmacology · doi:10.1016/j.intimp.2024.113329 · Cited by 10
Progression in Near-Infrared Fluorescence Imaging Technology for Lung Cancer Management
Chen, X., Li, Y., Su, J., Zhang, L., & Liu, H. (2024) · Biosensors · doi:10.3390/bios14100501 · Cited by 10
Liu, H., Zhou, C., Jiang, H., Chu, T., Zhong, R., Zhang, X., Shen, Y., & Han, B. (2024) · Frontiers in Immunology · doi:10.3389/fimmu.2024.1430301 · Cited by 10
“Most importantly, the methods above are invasive, relying heavily on biopsy, which further limits their utility (13, 14).”
BackgroundMethodGeng, Y., Yin, T., Li, Y., He, K., Zou, B., Yu, J., Sun, X., Zhang, T., & Teng, F. (2025) · Molecular Carcinogenesis · doi:10.1002/mc.23883 · Cited by 10
“This increase in the TMB is correlated with enhanced responses to IO, increasing the likelihood of generating neoantigens that make the immune system easily identify the tumor, thereby improving immune checkpoint inhibitor efficacy [30 – 32].”
Metadata
- Authors
- Jardim, D. L., Goodman, A., de Melo Gagliato, D., & Kurzrock, R.
- Affiliations
- Hospital Sírio-Libanês (BR)
- University of California San Diego (US)
- Corresponding author
- Kurzrock, Razelle
- Venue
- Cancer Cell
- Publisher
- Elsevier BV
- Published
- 2021-02
- Volume
- 39
- Issue
- 2
- Pages
- 154-173
- ISSN
- 1535-6108 (ISSN-L)
- PMC
- PMC7878292
- OpenAlex
- W3097803258
- Cited by
- 1,192
- References
- 151
- Citations by year
- 2026: 134 · 2025: 263 · 2024: 294 · 2023: 276 · 2022: 171 · 2021: 53
- FWCI
- 13.60
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
- www.elsevier.com/legal/tdmrep-license (tdm)
- www.elsevier.com/open-access/userlicense/1.0/ (vor, 372 d)
- doi.org/10.15223/policy-017 (stm-asf)
- doi.org/10.15223/policy-037 (stm-asf)
- doi.org/10.15223/policy-012 (stm-asf)
- doi.org/10.15223/policy-029 (stm-asf)
- doi.org/10.15223/policy-004 (stm-asf)
- Locations
- Cancer Cell (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- Astellas Pharma US
- National Cancer Institute (P30 CA023100)
- Janssen Pharmaceuticals
- AstraZeneca
- Bristol-Myers Squibb
- Genentech
- Roche
- EMD Serono
- Pfizer
- Meso Scale Diagnostics
- Topics
- Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
- Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer Genomics and Diagnostics
- Keywords
- tumor mutational burden, immunotherapy biomarkers, immune checkpoint inhibitors, neoantigens, MHC class I antigen presentation, T cell receptor repertoire, cancer immunotherapy response prediction
- MeSH terms
- Immune Checkpoint Inhibitors, Humans, Immunotherapy, Major Histocompatibility Complex, Mutation, Neoplasms, T-Lymphocytes, Biomarkers, Tumor
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