- 1Department of Oncology, The First People's Hospital of Jiangxia District, Wuhan City and Union Jiangnan Hospital, Huazhong University of Science and Technology, Wuhan, China
- 2The First Clinical College of Xuzhou Medical University, Xuzhou, China
- 3Siyang Hospital Oncology Department, Suqian, China
Objectives: To assess the efficacy and safety of nimotuzumab in combination with radiotherapy or chemoradiotherapy for locally advanced head and neck squamous cell carcinoma.
Methods: Systematic searches were performed on PubMed, Web of Science, Embase, Cochrane Library, China National Knowledge Infrastructure, China Biomedical Medicine, Wanfang, VIP databases. Seven eligible randomized controlled trials (n = 1012) were selected through rigorous inclusion and exclusion criteria.
Results: A total of 1012 cases were included. including 508 (50.2%) in the nimotuzumab combination treatment group; There were 504 cases (49.8%) in the control group. The results of meta-analysis showed that the overall survival (Hazard Ratio [HR]=0.75, 95% Confidence Interval [CI]: 0.62-0.90, P<0.05), progression-free survival (HR=0.69, 95% CI: 0.54-0.87, P<0.05), complete response rate (Risk Ratio [RR]=1.52, 95% CI: 1.24-1.86, P<0.05), and objective response rate (RR=1.32, 95% CI: 1.17-1.48, P<0.05) were significantly improved in the nimotuzumab combination treatment group compared with the control group. In terms of the incidence of adverse effects, only the incidence of rash was the nimotuzumab combination group higher than in the treatment alone group, and there was no significant difference between the remaining adverse reactions (neutropenia, anemia, nausea/vomiting, mucositis, dermatitis, dysphagia).
Conclusion: Nimotuzumab combined with radiotherapy or chemoradiotherapy is more effective than radiotherapy alone or chemoradiotherapy in locally advanced squamous cell carcinoma of the head and neck, and the safety profile is controllable. Therefore, the addition of nimotuzumab to treatment is expected to be an effective treatment option for this disease. However, more prospective randomized controlled trials are needed to fully explore the effectiveness of this treatment in patients with locally advanced head and neck squamous cell carcinoma.
Systematic Review Registration: identifier PROSPERO (CRD: 42022383313).
1 Introduction
Squamous cell carcinoma of the head and neck (SCCHN) is a common type of malignancy. In the US, an estimated 54000 new cases and 11230 deaths in 2022 (1). Management of SCCHN depends on the anatomical location and stage of the disease. In the case of locally advanced disease, radical radiotherapy combined with platinum-based therapy is standard therapy unless additional chemotherapy is not required because of poor physical condition or comorbidities (2).
Studies have shown that, Anti-epidermal growth factor receptor(EGFR) protein expression is seen in 90% or more of the SCCHN cases (3). A recent multivariate analysis demonstrated that over expression of EGFR in subjects with Locally advanced squamous cell carcinoma of head and neck(LA-SCCHN) was associated with early relapses, lower disease-free, and overall survival (4–6). EGFR overexpression is also resistant to radiation therapy and chemotherapeutic agents, leading to treatment failure (7). These suggests that EGFR monoclonal antibody (MAB) combined with radiotherapy (RT) or chemoradiotherapy (CRT) may benefit patients with LA-SCCHN.
Nimotuzumab is a humanized anti-EGFR MAB, which was obtained in 1996 after genetic modification of the Cetuximab parental murine molecule ior egf/r3 (8). Studies have shown that, Nimotuzumab can inhibit the downstream cascade of EGFR signaling by specifically binding to the extracellular domain of EGFR, Blocking of EGFR, signaling, To benefit cancer patients (9); It can also activate NK cells to exert the cytotoxic effect of antibody-dependent cells (10); Simultaneously activated NK cells induce the maturation of dendritic cell and tumor specific CD8 + T cells, To restore the HLA-I expression on the tumor cells, Thus, the reversal of the EGFR-mediated tumor immune evasion mechanism (4). In addition, the affinity of nimotuzumab to EGFR is medium, and it will selectively target tumor cells with high expression of receptors, but it has less binding with normal tissues such as skin and mucosa, resulting in low toxic response (11). Therefore, nimotuzumab can be used effectively and repeatedly for a long time. It has been approved by many countries for the treatment of nasopharyngeal carcinoma, pediatric and adult glioma, and advanced esophageal cancer, etc. (2, 12, 13). Since 2009, several studies have reported that nimotuzumab combined with RT/CRT is used for the treatment of LA-SCCHN. However, compared with CRT or RT alone, whether the combined use can improve the efficacy of LA-SCCHN and whether it can increase adverse reactions has not been evaluated by systematic meta-analysis. Therefore, this meta-analysis of randomized controlled trials (RCT) aims to systematically evaluate the efficacy and safety of nimotuzumab combined with RT/CRT in the treatment of LA-SCCHN and provide more evidence for the treatment of LA-SCCHN.
2 Materials and methods
This meta-analysis strictly adheres to the PRISMA statement and is registered on PROSPERO (CRD: 42022383313). All analyses were conducted based on previously published studies; thus, no ethical approval and patient consent are required.
2.1 Inclusion criteria
1. The pathological diagnosis was SCCHN;
2. The clinical TNM stage was stage III or IVa, IVb;
3. To compare the efficacy and safety of nimotuzumab combined with CRT/RT and CRT/RT alone;
4. Have one or more results: including overall survival (OS), progression free survival (PFS), complete response rate (CRR), objective response rate (ORR), disease control rate (DCR) or adverse events; OS, the time from diagnosis of LA-SCCHN to death due to any reason; PFS, the time from diagnosis of LA-SCCHN to tumor progression or death from any cause in any aspect; The efficacy of the two treatment groups was evaluated using the criteria for evaluating the efficacy of solid tumors (RECIST): CRR, all target lesions disappeared; PRR, the sum of the total diameter of the target lesion decreased by at least 30%; PD, the sum of the total diameters of the target lesions increased by at least 20%, or new lesions appeared; SD, taking the minimum value of the sum of total diameters as a reference, the reduction of target lesions did not reach PR, and the increase did not reach the level of PD; ORR, the proportion of patients with tumors shrinking to a certain extent and staying for a certain time, including CRR and PRR cases; DCR, the proportion of patients with disease remission (CRR+PRR) and stable SD after treatment, that is, the proportion of patients without disease progression PD;
5. The study design was a randomized controlled trial (RCT).
2.2 Exclusion criteria
1. Articles are in vitro tests, reviews, meta-analysis, conference summaries or case reports;
2. The study was a no randomized controlled trial (nRCT) or observational study;
3. Including studies on patients with nasopharyngeal carcinoma;
4. Articles that cannot be used, such as poor report quality and unclear data description and etc.
2.3 Search strategy
In the PubMed, Web of Science, Embase, Cochrane Library, China National Knowledge Infrastructure(CNKI), China Biomedical Medicine(CBM), Wanfang, VIP databases, two researchers(MG and CB) respectively used terms such as head and neck cancer, head and neck squamous cell cancer, oral cancer, tongue cancer, oropharyngeal cancer, laryngeal cancer, hypopharyngeal cancer, nimotuzumab, and their synonyms for systematic retrieval. At the same time, we also reviewed conference abstracts of the unpublished articles and searched the references list of relevant studies to find other potential studies. The last retrieval time was November 23, 2020. According to the inclusion and exclusion criteria, the literatures that meet these criteria are strictly selected.
2.4 Data extraction and quality assessment
Two investigators (MG and CB) independently extracted relevant data from all eligible studies, including first author, year of publication, country, study design, and number of cases, stage, age, treatment scheme, dose of nimotuzumab, dose of concurrent chemotherapy drugs. And, we also extracted the main outcome indicators: OS and PFS (Only the HR and 95% CI of both are extracted. If they cannot be extracted from the text, the method proposed by Tierney (14) is used to calculate these statistical variables using the available numerical data.), secondary outcome measures: CRR, ORR, DCR, and incidence rate of adverse events, including neutropenia, anemia, thrombocytopenia, nausea/vomiting, oral mucositis, radiation dermatitis, rash, dysphagia. Two researchers (YZ and FT) independently evaluated the quality of the finally included literature according to the Review Manager 5.3 software provided by the Cochrane collaboration network, including random sequence generation (selection bias), allocation concealment (selection bias), blinding of participants and personnel (performance bias), incomplete outcome data (attrition bias), selective reporting (reporting bias) and other biases, and assessing each risk of bias as high, low, or unclear risk (15). Any differences arising in the process of data extraction and quality assessment shall be jointly discussed and resolved by researchers.
2.5 Statistical analysis
Statistical analysis of the extracted study data was performed using Review Manager 5.3 and Stata15.0. OS and PFS are reported by hazard ratios (HRs) and 95% confidence intervals (CIs); The rest of the results were reported by risk ratios (RRs) and 95% confidence intervals (CIs). The P values were all bilateral, and statistical significance was set at P<0.05. We used the Cochrane Q test and I2 statistic to assess the heterogeneity of all included studies. If the heterogeneity was not significant (P>0.1, I2<50.0%), a fixed-effects model was used; otherwise, a random-effects model was used. We used funnel plot and Egger test to evaluate potential publication bias. P>0.05 indicates that there is no potential publication bias.
3 Results
3.1 Study characteristics
We preliminarily identified 1146 relevant articles from the database. After removing 352 duplicate literatures, we evaluated and screened the title, abstract or full text according to strict inclusion and exclusion criteria, and finally included 7 eligible RCT for meta-analysis (16–22). The detailed screening procedure is shown in Figure 1. 1012 cases were included, including 508 cases (50.2%) in the experimental group (nimotuzumab + CRT/RT) and 504 cases (49.8%) in the control group (CRT/RT). All patients treated with CRT had cisplatin-based concurrent chemoradiotherapy, and all patients treated with RT alone were considered as unsuitable cases for chemotherapy. The experimental group was treated with nimotuzumab according to the treatment protocol of the control group. The base information of the included studies is shown in Table 1.
3.2 Quality assessment of the included literature
As shown in Figures 2, 3, we assessed the quality of the final included studies using the tool of the Cochrane Collaboration. All the final included studies were RCT. Five studies (16–18, 20, 22) provided the randomization methods, and the remaining two studies (19, 21) did not describe any specific randomization method. Two studies (17, 20) provided information indicating that the allocation scheme was hidden. Four studies (16, 19, 21, 22) obtained informed consent from all included patients and were considered non-blind; one study (20) was double-blind; and the other studies (17, 18) did not mention the information related to blindness. The data and reports of the results included in the study were complete, without selective reporting or other biases. Overall, the risk of bias was low in all the studies included in this meta-analysis.
3.3 Main results
3.3.1 OS
Six of the included studies (17–21) reported OS in LA-SCCHN patients with no heterogeneity between studies (P = 0.43, I2 = 0%), and therefore, we used a fixed-effects model for our analysis. The results showed a pooled HR = 0.75 (95%CI 0.62-0.90). Suggested that patients receiving nimotuzumab plus CRT/RT had longer OS in LA-SCCHN compared to the CRT/RT group (P=0.002 <0.05, Figure 4A).
![www.frontiersin.org](https://www.frontiersin.org/files/Articles/1380428/fonc-14-1380428-HTML/image_m/fonc-14-1380428-g004.jpg)
Figure 4 Forest plot for OS (A), PFS (B) of nimotuzumab combined with RT/CRT group and RT/CRT alone group. OS, overall survival; PFS, progression free survival; CI, confidence interval; HR, hazard ratio.
3.3.2 PFS
Three of the included studies (16, 17, 21) reported PFS in LA-SCCHN patients with no heterogeneity between studies (P = 0.92, I2 = 0%); and therefore, we used a fixed-effects model for our analysis. The results showed HR = 0.69 (95%CI 0.54-0.87). Suggested that patients treated with nimotuzumab plus CRT/RT had better PFS compared to the CRT/RT group (P=0.002 <0.05 Figure 4B).
3.4 Secondary outcome
3.4.1 CRR
Six (16, 18–22) (460 patients) in the included study reported CRRs for LA-SCCHN patients. There was no heterogeneity between the studies (P = 0.53, I2 = 0%); Therefore, we used a fixed-effects model for the analysis. The results showed that CRR was significantly higher in nimotuzumab plus CRT/RT group compared to the CRT/RT group (RR = 1.52,95%CI:1.24-1.86, P <0.05/RT) (Figure 5A).
![www.frontiersin.org](https://www.frontiersin.org/files/Articles/1380428/fonc-14-1380428-HTML/image_m/fonc-14-1380428-g005.jpg)
Figure 5 Forest plot for CRR (A), ORR (B), DCR (C) of nimotuzumab combined with RT/CRT group and RT/CRT alone group. CRR, complete remission rate; ORR, objective response rate; DCR, disease control rate; CI, confidence interval; RR, risk ratio.
3.4.2 ORR
Five (16, 18, 19, 21, 22) (354 patients) in the included study reported the ORR for the LA-SCCHN patients. There was no heterogeneity between the studies (P = 0.30, I2 = 18%); Therefore, we used a fixed-effects model for our analysis. The results showed that the ORR was significantly higher in nimotuzumab and CRT/RT group compared to the CRT/RT group (RR = 1.32, 95%CI:1.17-1.48, P <0.05) (Figure 5B).
3.4.3 DCR
Five (16, 18, 19, 21, 22) (354 patients) in the included study reported DCRs for LA-SCCHN patients. By heterogeneity, P = 0.007 <0.1, I2 = 69%> 50%, suggesting that there was heterogeneity among the literature selected for this study, so a random effect model was applied for the analysis. Results showed that this result was not statistically significant. (RR = 1.14,95%CI:1.00-1.31, P =0.05) (Figure 5C).
3.4.4 Adverse reactions
Three (16, 17, 21) (705 patients) reported neutrophilic reduction, four (16–18, 21) (734 patients) reported anemia, three studies (16, 17, 21) (705 patients) reported thrombocytopenia, four (16, 17, 19, 21) (797 patients) reported nausea/vomiting, five (16–19, 21) (826 patients) reported oral mucositis, two (16, 17) (623 patients) reported radiation dermatitis, three (16, 17, 21) (705 patients) reported rash, and three (17–19) (657 patients) reported dysphagia. There was no heterogeneity across studies (P> 0.1, I2<50%), so a fixed-effects model was used for the analysis. The results showed that the incidence of rash was higher in the nimotuzumab combination group than in the control group (RR = 3.28,95%CI:1.43-7.54, P =0.005 <0.05). The incidence of platelets in nimotuzumab was lower than in the control group, and the difference was statistically significant (RR=0.70, 95%CI:0.51-0.96, P=0.03<0.05). There were no significant differences in the incidence of the remaining neutrophilia, anemia, nausea/vomiting, oral mucositis, radiation rash, and dysphagia. (RR=0.95, 95%CI:0.70-1.29, P=0.75>0.05)、(RR=1。05, 95%CI:0.96-1.13, P=0.28>0.05)、(RR=1.02, 95%CI:0.89-1.16, P=0.81>0.05)、(RR=1.00, 95%CI:0.95-1.05, P=0.90>0.05)、(RR=1.00, 95%CI:0.94-1.07, P=0.95>0.05)、(RR=0.99, 95%CI:0.92-1.07, P=0.83>0.05) (Figure 6).
![www.frontiersin.org](https://www.frontiersin.org/files/Articles/1380428/fonc-14-1380428-HTML/image_m/fonc-14-1380428-g006.jpg)
Figure 6 Forest plot for adverse reactions of nimotuzumab combined with RT/CRT group and RT/CRT alone group. CI, confidence interval; RR, risk ratio.
3.5 Publication bias
We evaluated publication bias by visually observing the symmetry of the funnel plot and quantitatively Egger testing. Funnel plots of OS, PFS, CRR, no significant asymmetry was observed from visual assessment (Figures 7A, B, 8A), and there was no publication bias using Egger testing (OS P = 0.180, PFS P = 0.659, CRR P = 0.067). The funnel plots of ORR and DCR showed asymmetry, and passed the Egger test, and there was publication bias (P=0.003<0.05, p=0.013<0.05). Therefore, the trim and fill method were used to assess whether publication bias in this meta-analysis affected the stability of the results. The updated results did not reverse (ORR:RR=1.229, 95%CI:1.077-1.427, p=0.003<0.05;DCR:RR=1.063, 95%CI:0.950-1.189, p=0.286>0.05), and the adjusted funnel chart was clearly symmetrical (Figures 8B, C). Therefore, the results of our meta-analysis are reliable.
4 Discussion
The poor prognosis of patients with LA-SCCHN drives the evaluation of CRT. In a meta-analysis of 107 randomized trials and 19805 patients (23), confirming that CRT was the primary treatment option for LA-SCCHN. However, even after CRT, local recurrence or distant metastasis remains a challenge. Related studies have found that the addition of antibodies targeting EGFR to CRT can improve treatment outcomes. However, many toxic deaths were reported in the combination therapy based on cetuximab or panitumumab (24–27), and overlapping toxicities hinder the implementation of the treatment. For example, According to adverse event reports from Cetuximab treatment, the incidence of adverse events is as high as 89%, including fatal pulmonary embolism and anaphylactic shock (28). And unlike the above EGFRMab, nimotuzumab would selectively target tumor cells with high expression of EGFR receptor without binding to normal tissues. Therefore, the incidence of adverse reactions is low (29, 30). At present, nimotuzumab has been widely used in the treatment of glioma (31), lung squamous cell carcinoma (32), esophageal cancer (33), pancreatic cancer (34) and other solid tumors. And showed a better efficacy and safety profile. In recent years, there have been many clinical studies of nimotuzumab in the treatment of SCCHN. A study by Reddy et al (19) evaluating the treatment of LA-SCCHN with nimotuzumab combined with RT/CRT showed that compared with RT alone, the 5-year OS of nimotuzumab combined with RT increased by 13% and the risk of death decreased by 24%; Compared with CRT, the 5-year OS of nimotuzumab combined with CRT increased by 27% and the risk of death decreased by 64%.Ang et al (35) single arm, Phase II study of nimotuzumab combined with CRT in patients with LA-SCCHN showed a CRR of 59%, a median PFS of 17.5 months (95% CI:11.1-54.5), a 3-year PFS of 40.4% (95% CI:24.3-55.9), no grade 3-4 skin toxicity, and the incidence of grade 3 or higher grade mucositis and hypokalemia was similar as expected for CRT. Another study of nimotuzumab plus chemotherapy for recurrent or metastatic head and neck squamous cell carcinoma (R/M SCCHN) showed that the overall response rate increased by 19.2% compared with chemotherapy alone (p = 0.023). Median PFS increased by 2 months (p = 0.009) without any significant increase in toxicity (36). Other studies of nimotuzumab in SCCHN (37, 38) also showed similar results. It can be seen that the treatment of nimotuzumab combined with chemotherapy or RT or CRT for SCCHN can improve the short-term and long-term efficacy without increasing the toxic reaction. Nimotuzumab has become a new option for the treatment of SCCHN. However, the sample size of these studies was small, so we considered using meta-analysis to study the efficacy and safety of nimotuzumab plus RT/CRT in LA-SCCHN.
This study searched the relevant clinical research literature and included 7 randomized controlled trials involving 1012 cases. The main purpose of this study was to evaluate the effect of combined treatment with nimotuzumab on OS and PFS. The results showed that compared with RT/CRT group, the combined treatment group with nimotuzumab had longer OS (HR=0.75,95%CI, 0.62-0.90, P<0.05) and better PFS (HR=0.69, 95% CI, 0.54-0.87, P<0.05). At the same time, the recent efficacy such as CRR, ORR, DCR was also analyzed, and the results showed that CRR and ORR were also significantly improved compared with RT/CRT alone. In addition, we analyzed the incidence of adverse effects after combination therapy and showed that only the nimotuzumab combination group was higher than the RT/CRT alone group in the incidence of rash, and there was no clear difference between the remaining adverse effects (neutropenia, anemia, nausea/vomiting, mucositis, dermatitis, dysphagia). But Patil et al (17) and Thai et al (16) showed that the incidence of rash was within a controllable range, and there was no rash incidence above grade 3. Therefore, this meta-analysis demonstrated controllable safety of combination therapy. Of course, there are some limitations in this meta-analysis: only 7 documents are included, and the sample size is not large enough; The quality score of the documents is uneven; There are differences in radiotherapy methods and chemotherapy doses among the study groups, and there are two control studies that only use radiotherapy because patients cannot tolerate chemotherapy drugs, which may lead to publication bias. Therefore, the conclusions in this paper need to be further demonstrated by more large samples and multi-center randomized controlled trials.
5 Conclusion
In this meta-analysis, we observed that OS, PFS, CRR, ORR were superior to RT/CRT in nimotuzumab plus RT/CRT with no significant difference in safety. This provides some evidence suggesting that adding nimotuzumab to RT/CRT may be an effective method for treating LA-SCCHN. However, more prospective randomized controlled clinical trials are still needed to fully explore the effectiveness of this treatment in patients with LA-SCCHN.
Data availability statement
The original contributions presented in the study are included in the article/supplementary material. Further inquiries can be directed to the corresponding authors.
Author contributions
MG: Writing – original draft. DZ: Writing – original draft, Writing – review & editing. YZ: Data curation, Methodology, Project administration, Writing – original draft. MM: Data curation, Project administration, Validation, Writing – original draft. KS: Methodology, Data curation, Writing – original draft. XW: Project administration, Formal analysis, Methodology, Supervision, Writing – original draft. CB: Formal analysis, Methodology, Supervision, Writing – original draft.
Funding
The author(s) declare that no financial support was received for the research, authorship, and/or publication of this article.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
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Keywords: locally advanced head and neck squamous cell carcinoma, nimotuzumab, chemoradiotherapy, radiotherapy, meta-analysis
Citation: Guan M, Zhang D, Zhao Y, Mao M, Shen K, Wang X and Bi C (2024) Nimotuzumab combined with radiotherapy+/- chemotherapy for definitive treatment of locally advanced squamous cell carcinoma of head and neck: a metanalysis of randomized controlled trials. Front. Oncol. 14:1380428. doi: 10.3389/fonc.2024.1380428
Received: 01 February 2024; Accepted: 12 April 2024;
Published: 13 June 2024.
Edited by:
Paolo Bossi, Humanitas Research Hospital, ItalyReviewed by:
Maria Cossu Rocca, European Institute of Oncology (IEO), ItalyYuri Ueda, Tokyo Medical University Hospital, Japan
Copyright © 2024 Guan, Zhang, Zhao, Mao, Shen, Wang and Bi. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Chun Bi, 1757883924@qq.com; Xia Wang, WangXia-66@163.com
†These authors have contributed equally to this work and share first authorship