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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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“TMB can be used to predict the ability to respond to immunotherapy, with higher TMB representing a higher likelihood of being immunotherapy effective (Jardim et al., 2021).”
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“Additionally, as an indicator of tumor mutations, TMB is frequently used to predict the efficacy of immunotherapy [30].”
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“TMB is a potential pan-cancer predictive biomarker of immune checkpoint inhibitor response in most cancers (Jardim et al., 2021).”
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“As shown in Figure 3D, higher TMB was significantly associated with higher intratumor heterogeneity (P 0.05).”
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“However, the frequency of mutations was lower in high-risk patients, and in general, the frequency of mutations was higher in patients with poor prognoses, suggesting that our classification is not suitable for studies that predict immunotherapy response based on tumor mutational burden (TMB) (Jardim et al., 2021).”
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“This is particularly relevant as high TMB has been associated with increased neoantigen load, potentially enhancing the efficacy of immunotherapies [24, 25].”
Chen, Z., Hu, B., Cai, K., Gao, H., Xian, Z., Zhang, S., Fang, Z., Zhou, Q., Ren, D., & Zou, Q. (2025) · Cancer Immunology Immunotherapy · doi:10.1007/s00262-025-04027-x · Cited by 6
Peters, S., Oliner, K. S., L’Hernault, A., Ratcliffe, M., Madison, H., Lai, Z., Stewart, R., Mann, H., Lowery, C., Garon, E. B., et al. (2025) · ESMO Open · doi:10.1016/j.esmoop.2025.105058 · Cited by 5
“This was in line with expectations from mechanistic studies, which have indicated that higher TMB is correlated with more tumor neoantigens, 12,14 and previous clinical trials of regimens combining tremelimumab and durvalu-mab in fi rst-line treatment of patients with mNSCLC. 6,9 28-30 Patients with…”
Kinoshita, M., Sato, Y., Kubo, S., Shinkawa, H., Kimura, K., Nishio, K., Tanaka, R., Kurihara, S., & Ishizawa, T. (2025) · Cancers · doi:10.3390/cancers17132082 · Cited by 5
“Tumor antigen release is caused by various mechanisms, and the tumor mutation burden (TMB) has one of the most representative roles [29,30].”
Liao, P., Han, Z., Yan, B., Chen, F., & Lei, P. (2025) · International Journal of Biological Macromolecules · doi:10.1016/j.ijbiomac.2025.145707 · Cited by 5
Gbadamosi, M. O., Molchan, E., Makarem, M. S., Coleman, K. L., Ohaegbulam, A., & Streeks, K. H. (2025) · OncoImmunology · doi:10.1080/2162402x.2025.2527303 · Cited by 6
“187,188 Nevertheless, there are some data pointing to utility in TNBC. Specifically, in the KEYNOTE-119 study, increased TMB was associated with response to pembrolizumab as a single agent, but not chemotherapy in patients with mTNBC. 189”
Lin, H., Ma, X., Zhu, X., & Zhong, L. (2025) · Frontiers in Oncology · doi:10.3389/fonc.2025.1630056 · Cited by 6
“Conversely, tumors with low TMB are often associated with a diminished or suboptimal therapeutic response to these treatments (89).”
Bharadwaj, S., Mierzwicka, J. M., Vaňková, L., & Malý, P. (2025) · Cell Communication and Signaling · doi:10.1186/s12964-025-02410-w · Cited by 7
Chaudhary, R., Moorhead, G., Park, R., Li, J., Schell, M. J., Song, X., Tan, A. C., Slebos, R. J. C., Biernacki, M. I., Freeman, S. S., et al. (2025) · Clinical Cancer Research · doi:10.1158/1078-0432.ccr-25-2201 · Cited by 5
Wijnen, S. C. M. A., Dimitriadis, P., Wessels, L. F. A., & Blank, C. U. (2026) · European Journal of Cancer · doi:10.1016/j.ejca.2026.116711 · Cited by 5
Hu, Q., Frank, M. L., Gao, Y., Ji, L., Peng, M., Chen, C., Wang, B., Hu, Y. W., Wu, Z., Li, J., et al. (2023) · OncoImmunology · doi:10.1080/2162402x.2023.2233399 · Cited by 5
“Tumor mutational burden (TMB) is another biomarker associated with efficacious responses to ICB and adoptive transfer of expanded autologous CD8 + T cells 8,9 .”
BackgroundConci, N., Tassinari, E., Tateo, V., Rosellini, M., Marchetti, A., Ricci, C., Chessa, F., Santoni, M., Grande, E., Mollica, V., et al. (2023) · Molecular Diagnosis & Therapy · doi:10.1007/s40291-023-00679-6 · Cited by 5
“Moreover, a high somatic mutation rate with a median of 5.5 per megabase was reported, similar to that of non-small cell lung cancer and melanoma, hypothetically predicting a better efficacy of immune checkpoint inhibitors [28].”
InfluentialAnsari, A. I., Ray, S. K., Sharma, M., Rawal, R., & Singh, P. (2023) · Current Molecular Medicine · doi:10.2174/0115665240266906231024111920 · Cited by 5
Li, Q., Liu, G., Qiu, Q., Zhang, J., Li, R., Zhao, J., She, J., & Chen, Y. (2024) · Scientific Reports · doi:10.1038/s41598-024-52596-1 · Cited by 5
“Accumulative evidence shows that patients with a high TMB may benefit from immune checkpoint inhibitors (ICIs) 17 .”
Zeng, Y., Yu, T., Jiang, S., Wang, J., Chen, L., Lou, Z., Pan, L., Zhang, Y., & Ruan, B. (2024) · Scientific Reports · doi:10.1038/s41598-024-52632-0 · Cited by 5
Liu, S., He, K., Yang, L., Xu, F., Cui, X., Li, Q., Li, X., & Ren, B. (2024) · Journal of Cellular and Molecular Medicine · doi:10.1111/jcmm.18092 · Cited by 5
“58 Chen et al. 59 reported that camrelizumab response was not correlated with TMB.”
Liang, S., Ji, L., Yu, Z., Cheng, Y.-H., Gao, R., Yan, W., & Zhang, F. (2024) · Hereditas · doi:10.1186/s41065-024-00311-5 · Cited by 5
“TMB, which is the total number of somatic mutations per megabase (Mb) in the tumor genome, relates to the emergence of neoantigens triggering tumor immunity [31].”
BackgroundMoussa, P. (2024) · American Journal of Cancer Research · doi:10.62347/eced5481 · Cited by 6
Zhu, Y., Li, Z., Wu, Z., Zhuo, T., Dai, L., Liang, G., Peng, H., Lu, H., & Wang, Y. (2024) · Oncology Letters · doi:10.3892/ol.2024.14509 · Cited by 5
Resnick, K., Monroe, C. R., Siddiqi, I. N., & Tam, E. L. (2024) · Frontiers in Oncology · doi:10.3389/fonc.2024.1360726 · Cited by 5
Pan-cancer analysis of ADAR1 with its prognostic relevance in low-grade glioma
Yang, Q., & Li, X. (2024) · Immunobiology · doi:10.1016/j.imbio.2024.152855 · Cited by 5
Li, H., Jin, Y., Zhang, Y., Xie, X., & Li, N. (2024) · Chemical Biology & Drug Design · doi:10.1111/cbdd.70006 · Cited by 5
Role of CALCR expression in liver cancer: Implications for the immunotherapy response
Wang, S., Wang, W., & Zeng, J. (2024) · Molecular Medicine Reports · doi:10.3892/mmr.2024.13406 · Cited by 6
“Additionally, the associations between CALCR expression and genomic heterogeneity features, including the tumor mutational burden (TMB), microsatellite instability (MSI), neoantigen load (NEO) and homologous recombination deficiency (HRD) were investigated across multiple types of cancer, with a particular focus on LI…”
Zheng, W.-J., Xu, Y., Tan, H. S., Chen, S., Wang, P., Sun, H., Li, R., Zeng, H., Zhong, Y.-C., Cheng, J., et al. (2025) · Liver Cancer · doi:10.1159/000544966 · Cited by 5
“Additionally, the positive correlation between the T SUVmax /L SUVmax and TMB is noteworthy because a higher TMB has been linked to improved responses to immune checkpoint inhibitors (ICIs) in several cancer types [67].”
Sun, M., Zhang, Q., He, Z., Luo, Y., Tu, Y., Peng, L., Mao, H., Zhang, J., Qiu, T., & Zhang, Y. (2025) · ACS Omega · doi:10.1021/acsomega.5c01496 · Cited by 5
Zhao, J., Dong, Y., Bai, H., Duan, J., Wang, G., Xu, J., Wang, J., & Wang, Z. (2020) · Journal of the National Cancer Center · doi:10.1016/j.jncc.2021.11.006 · Cited by 5
Genomic mapping of copy number variations influencing immune response in breast cancer
López-Cade, I., García‐Barberán, V., Morafraile, E. C., Díaz‐Tejeiro, C., Sáiz-Ladera, C., Sanvicente, A., Segura, P. P., Pandiella, A., Győrffy, B., & Ocaña, A. (2022) · Frontiers in Oncology · doi:10.3389/fonc.2022.975437 · Cited by 6
“Beyond the mere presence of a higher mutational load or genomic instability that leads to a higher presence of neo-epitopes and therefore a more immune infiltrate microenvironment (60), a global analysis of copy number variations in relation to immune populations has not been explored.”
BackgroundCuproptosis-related gene signatures for predicting prognosis of lung adenocarcinoma
Ye, W., Huang, Y., & Li, X. (2022) · Medicine · doi:10.1097/md.0000000000030446 · Cited by 5
“[21] However, its use in LC has not been extensively extrapolated.”
Saltman, D. L., Varga, M. G., Nielsen, T. J., Croteau, N. S., Lockyer, H. M., Jain, A., Vidal, G. A., Hout, D. R., Schweitzer, B. L., Seitz, R. S., et al. (2022) · Clinical Lung Cancer · doi:10.1016/j.cllc.2022.11.009 · Cited by 5
Gao, L., Wang, X., Wang, X., Wang, F., Tang, J., & Ji, J. (2022) · Frontiers in Oncology · doi:10.3389/fonc.2022.1054564 · Cited by 5
“Studies have demonstrated that TMB can serve as an important component of composite predictors to guide tumor immunotherapy (26).”
BackgroundWang, M., Liu, X., Wang, Q., & Zhang, H. (2023) · Frontiers in Genetics · doi:10.3389/fgene.2022.1104338 · Cited by 5
“The mechanism of ICIs for cancer treatment is primarily to reactivate T-lymphocytes and boost the body’s immune system, resulting in anti-tumor activity (Jardim et al., 2021).”
BackgroundRen, Z., Wang, L., & Leng, C. (2023) · Aging · doi:10.18632/aging.204964 · Cited by 5
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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