Abstract
Hypopharyngeal carcinoma (HPC) has one of the poorest prognoses among all types of head and neck squamous cell carcinoma (HNSCC). Artificial intelligence (AI) is a scientific field that is in the spotlight, especially in the last decade, and AI has also been widely used in the research field of HPC. This scoping review aimed to describe the improvement of HPC clinical cares brought by AI. Literatures utilizing AI and machine learning in HPC were searched in PubMed, EMBASE, and Web of Science, and 116 articles from 1987 to 2024 were retrieved. After removing duplicate and irrelevant articles, 85 were further selected for detailed review. AI helps analyze large amounts of data from HPC patients and develop models to facilitate clinical practice. The emergence of AI improves the endoscopic, radiologic, and pathologic diagnosis accuracy of HPC and guides personalized treatment and prognosis prediction. However, there are certain unmet challenges that need to be further elucidated, like interpreting the AI algorithms into features that can be observed by humans and promoting the AI models in larger and multi-centered cohorts.
Introduction
Hypopharyngeal cancer (HPC) describes tumors arising between the level of the hyoid bone and the lower end of the cricoid cartilage, and squamous cell carcinoma (SCC) from the mucosal layer is the most common histology identified in 95% of the cases.1 Patient management mainly includes surgery, radiotherapy, and chemotherapy. However, open surgery, like total laryngectomy, inevitably destroys patient laryngeal function, including breathing, speaking, and swallowing.2 Other therapies might also lead to life-threatening complications, such as leukopenia, hepatotoxicity, and thyroid dysfunction.3 Despite the effort and research in HPC fields, largely unmet challenges exist. HPC is still one of the worst prognostic type of head and neck squamous cell carcinoma (HNSCC), and the overall 5-year survival rate was only about 41.3%.4 HPC increases the economic and societal burden, and novel techniques aiding clinical practice are warranted.5
In the last few decades, there is an increasing interest in artificial intelligence (AI) and machine learning, which refer to systems that perform human-like tasks, including to process, mine, learn, and respond to information gained from big data.6 The computational and programming steps in AI and machine learning allow the analysis of large amounts of complex data for meaningful patterns and consequent knowledge. Deep learning helps in automatically identifying disease stages, guiding patient therapy options, and predicting the prognosis.7 Robotic surgery assisted by AI offers a minimally invasive approach, and it better aligns with the organ-preservation protocol and has developed rapidly in HPC management.8,9 Molecular docking and molecular dynamics simulation help evaluate the bioactivity of promising agents against anticancer target.10-14 Chat Generative Pre-Trained Transformer (ChatGPT) provides timely and convenient responses to common patient questions and can serve as a supplementary tool for patient education.15 Indeed, AI improves the levels of HPC clinical workflow and facilitates decision-making in clinical practice.
In this review, we systematically searched the literature for articles that employed AI or machine learning techniques in HPC clinical practice, including predictive models for diagnosis, treatment, and prognosis, AI-assisted surgical systems, and AI-assisted investigation of marker genes in disease underlying mechanisms. Then, we classified these literatures into HPC diagnosis, treatment, and prognosis prediction. This review attempts to map the existing literature of AI application in HPC and summarize current improvement.
Methods
According to the Preferred Reporting Items for Systematic reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR),16 we systematically searched the literature through June 5, 2024 for articles using AI or machine learning techniques in HPC research. We searched three databases (PubMed, EMBASE, and Web of Science) using the following terms: ‘artificial intelligence’ AND ‘hypopharyngeal carcinoma’; ‘machine learning’ AND ‘hypopharyngeal carcinoma’; ‘data mining’ AND ‘hypopharyngeal carcinoma’; ‘decision tree’ AND ‘hypopharyngeal carcinoma’; ‘neural network’ AND ‘hypopharyngeal carcinoma’; ‘random forest’ AND ‘hypopharyngeal carcinoma’; ‘support vector machine’ AND ‘hypopharyngeal carcinoma’; ‘artificial intelligence’ OR ‘machine learning’ OR ‘data mining’ OR ‘decision tree’ OR ‘neural network’ OR ‘random forest’ OR ‘support vector machine’ AND ‘hypopharyngeal carcinoma’ (Figure 1A). No limits were imposed on the publication year. After removing duplicates, we retrieved 58, 59, and 33 literatures from PubMed, EMBASE, and Web of Science, respectively. Then, totally 116 articles were further screened, and articles not in English (n = 3), case reports (n = 3), comments (n = 3), reviews (n = 13), meeting abstracts (n = 5), and irrelevant (n = 4) were removed. Finally, 85 articles were included in this study.
(A) Flowchart of the literature search; (B) Distribution of articles published per year that employed artificial intelligence (AI) and relevant machine learning techniques for hypopharyngeal carcinoma (HPC) research; (C) Distribution of geographical location by continent of included articles.
Figure 1B presents the distribution of studies using AI or machine learning techniques for HPC research over the course of approximately 20 years, from 2009 to 2024. During the first decade there was minimal use of such techniques for HPC, while from 2019 on, we observed a considerable and progressive increase. In Figure 1C, the distribution of geographical location by continent of included studies are shown, and studies from Asia accounted for the largest proportion (58%).
Results
HPC Diagnostics
Early diagnosis of HPC allows early intervention and improves long-term survival, and the AI models utilized in clinical variables, endoscopic, radiologic, and pathologic examination are summarized in Table 1.
Summary of AI and machine learning models in hypopharyngeal carcinoma (HPC) diagnosis
Clinical Variables
Cervical lymph node status is crucial for guiding surgical approach, and primary tumor stage (T3/T4), blood neutrophil count (>5.0×109/L), and platelet count (>168×109/L) offer valuable guidance for personalized prediction of lymph node metastasis (LNM) in HPC patients.17
Confocal Laser Endomicroscopy (CLE)
CLE allows surface imaging of hypopharyngeal mucosa in vivo at a thousand-fold magnification, and corkscrew-like vessels, dilated intraepithelial capillary loops, and increased capillary leakage are significantly more frequently detected in malignant lesion compared to the healthy epithelium.18,19 By Cellvizio Viewer software, a vessel diameter of 30 μm in capillary loops was considered as a cut-off value aiding malignance identification.20 A point-wise spatial attention network model trained by endoscopic imaging could reach an average accuracy of 96.3% in automatically performing semantic segmentation and tumor recognition.21 As for real-time HPC identification, the diagnostic accuracy of a Laryngopharyngeal Artificial Intelligence Diagnostic System (LPAIDS) in both white-light imaging (WLI) and narrow-band imaging (NBI) achieved more than 0.940, which is comparable to experts and can be adapted in various centers.22 Endoscopy can also evaluate the overall function of the larynx, and novel models involving this factor might further enhance the diagnosis accuracy and guide the resection margin of surgery.23
Radiology
Computed tomography (CT) is the most used clinical tool in HPC diagnosis, tumor-node-metastasis (TNM) staging, and organs-at-risk (OARs) delineation.24 T stage is essential for patient treatment, in which ≤ T2 staging is defined as early, and ≥ T3 staging is advanced stage. Several studies have leveraged CT-based radiomics to predict T-stage,25,26 consistently reporting high accuracy (area under receiver operating characteristic [ROC] curve [AUC] >0.90). However, these models were developed on relatively small, single-center cohorts, and the specific radiomic features used often differed, highlighting a critical need for external validation and feature standardization before clinical application. Radiomics-based models also helped in LNM diagnosis and histological grades.27,28
Magnetic resonance imaging (MRI) also provides useful data for machine learning. DeepLab V3 + and U-Net models showed good performance in automated segmentation and MRI feature extraction and held great potential for facilitating more efficient clinical workflow.29 MRI could also be used preoperatively for LNM prediction.30 Additionally, in up to 5% of head and neck cancer cases, LNM was first detected within the head and neck region, while the location of the primary tumor was unknown.31 AI identifies the significant difference of radiomic features in LN, and then predicts different primary tumor sites.32 While promising, this model was validated on only 38 patients,32 underscoring the risk of overfitting. Moreover, the multimodality image combination of CT, MRI, and position emission tomography (PET) might further improve tumor segmentation.33
Pathology
The pathological biopsy represents the gold standard for HPC diagnosis, and cancer cell identification on histological images by AI is increasingly applied in clinical practice. Compared to other sub-cellular components, nuclei especially exhibit more cancer-related information, like variations in nuclear shape and size, atypical mitotic figures, and hyperchromasia. A study developed hyperspectral imaging (HSI) for automatic SCC nuclei detection, and the average AUC and accuracy reached 0.94 and 82.4%, respectively.34,35 Koyuncu et al.36 further defined tumor cell multinucleation index (MuNI) using a deep learning model, defined as three tumor cells in the high-power field (HPF) with three or more nuclei in the same cell, which is strongly related to depletion of effector immunocyte subsets and reduced survival rate in HPC patients. Perineural invasion (PNI) has a negative prognostic impact on HNSCC patients, and it can be diagnosed by the domain knowledge enhanced yield (Domain-KEY) algorithm, whose accuracy was 89.01%.37 Another study created a linear support vector machine classifier based on the whole-slide images (WSI) immunohistochemistry (IHC) staining of CD45 and Ki-67 to distinguish intratumor heterogeneity.38 By probe electrospray ionization mass spectrometry (PSEI-MS), mass spectra were developed, and could help define the borders of the cancerous regions.39 However, these studies are based on small sample size, and more data from larger population are needed to create robust classifiers and reduce the overfitting risk and interbatch intensity variability.
HPC Treatment
The utilization of AI in HPC treatment mainly included three parts: AI-assisted surgical operation, prediction models by machine learning in the efficacy of radiotherapy and chemotherapy (Table 2), and AI-assisted investigation of new chemotherapy and immunotherapy targets.
Summary of AI and machine learning models in radiotherapy and chemotherapy of hypopharyngeal carcinoma (HPC) patients
Surgery
Compared to radical open surgery, the recent trend in surgical treatment of HPC is organ preservation, intending to maintain swallowing and speech function and quality of life as much as possible.40-42 Transoral robotic surgery has been used in HPC patients since 2007,43 and either the da Vinci Robotic System44,45 or the Flex Robotic System46 has been proven to be valid and feasible. Transoral robotic surgery is more suitable for patients with low risk of positive surgical margins.47 However, complications might occur during transoral robotic surgery, including bleeding and need for tracheostomy or gastrostomy tube.48-50 AI could analyze risk factors for complications based on big data preoperatively. For example, for prolonged postsurgical enteral feeding prediction, body mass index, previous radiotherapy, preoperative dysphagia, type of surgery, and flap reconstruction were independent factors.51
Radiotherapy
Adjuvant radiotherapy is standard of care for HNSCC patients with positive surgical margins or extracapsular extension.52,53 Based on an in-house AI classification model, lymph nodes could be characterized as involved or suspicious, which guided different intensity of radiotherapy.54 As for predicting the effectiveness of radiotherapy, higher absolute peripheral lymphocyte counts demonstrated a higher possibility to achieve a complete response (CR).55 Pathological parameters, like the expression of Ku70 (involved in DNA repair mechanism), also predict radiotherapy result.56
Although radiotherapy is ontologically sound and reaches highly favorable quality-of-life outcomes, xerostomia and mucositis are common sequelae. With radiomics (CT images) and dosiomics (radiotherapy dose distribution) input, a hybrid predictive model of xerostomia comprising a 3D residual convolutional neural network was proposed, with AUC up to 0.84.57 Individualized regimens and more reliable biomarkers are still in need for personalized radiotherapy treatment.
Chemotherapy
Currently, docetaxel, cisplatin, 5-fluoruracil (TPF) treatment is the major regimen of chemotherapy for HNSCC, but only half of all patients exhibit good response to TPF treatment.5 For personalized treatment, AI identified that age, primary tumor stage, human papillomavirus (HPV) status, and Karnofsky performance status were indicative parameters of significant tumor volume reduction and survival benefit.58-60 Radiomics signatures of CT and multisequence MRI could also predict progression-free survival and pathological complete response (pCR) in advanced HNSCC patients undergone induction chemotherapy.61,62
A study further identified a gene expression signature between TPF-sensitive and non-sensitive patients, and based on GATS, PRIC285, ARID3B, ASNS, CXCR1, FBN2, MYOM3, SLC27A5, and STC2, a support vector machine model was trained, with 88.3% sensitivity and 88.9% specificity.63 Another study constructed a more precise six-gene signature (NRIP1, GIMAP27, CD72, THBS4, ABCA9, and SNED1) to predict tumor response and overall survival in locoregionally advanced HPC patients, and this gene model reached an AUC of 0.949.64. PPARG and its interconnectedness (AKT1, TP53, PTEN, MAPK1, NOTCH1, BECN1, PTGS2, SPP1, and RAC1) were also involved in the regulation of chemosensitivity.65,66 SPP1 was closely related to M2 macrophages infiltration, LNM, and poor prognosis.67 Clinical parameters and genetic characters all participate in patient response to chemotherapy, and recognizing TPF-sensitive patients in advance is necessary.
Immunotherapy
Immunotherapy is the new treatment landscape of head and neck cancer, with checkpoint inhibitors including pembrolizumab and camrelizumab, and has been proven to be efficient and well-tolerated.68-71 However, due to the complex microenvironment, primary resistance can be shown in patients who underwent PD-(L)1-targeted regimens.72 The predictive and prognostic biomarkers of immunotherapy remain limited.
AI also recognizes active ingredients and new targets for HPC immunotherapy.73,74 CD73 is a new therapeutic target induced by the epidermal growth factor (EGF)-EGF receptor (EGFR)-epithelial-mesenchymal transition axis, and mediates local invasion in especially advanced HPV-negative HPC. Except anti-EGFR cetuximab, a novel antagonizing antibody 22E6, might also be promising after appropriate processing.75
HPC Prognosis of Survival Status and Tumor Recurrence
Clinical Predictors
Age ≥60 years, advanced TNM stage (with lymphovascular, perineural, or thyroid invasion), poorly differentiated pathology, no adjuvant radiotherapy or chemotherapy accepted, and smoking were independent prognostic factors for 3-year survival status of HPC patients (Table 3).76-79
Summary of AI and machine learning models in prognosis of hypopharyngeal carcinoma (HPC) patients
Radiomics
Quantitative ultrasound delta-radiomics during radical radiotherapy are efficient in predicting tumor recurrence, and its accuracy and AUC were 82% and 0.81, respectively.80 Radiomic features from CT and MRI also aided in patient survival prediction and tumor recurrence diagnosis.81-84 Furthermore, 18-fluorodeoxyglucose (FDG)-PET measures metabolic activity (maximum standardized uptake value, SUV max) of the local tumor area and the regional lymph nodes and predicts HPC progression.85-87
Marker Genes
Sequencing data showed a more frequent presence of tumor suppressor gene mutations than oncogene mutations, and p53 and p16 protein expression are important prognostic biomarkers in HPC development and response to treatment.88 A study demonstrated that compared to laryngeal carcinoma, hypopharyngeal carcinoma had less central memory T cells, T follicular helper cells, transforming growth factor-β response, and CD4+T memory resting cells.89 By RNA sequencing, serum high resolution mass spectrometry, and secretomes, many genes, metabolites, and microRNAs were found to be aberrantly expressed in tumors,90-97 but there is still no widely-accepted model. Further development of markers staining protocol and scoring system, as well as the more accessible serum proteomics, are warranted before broad application in the clinical setting.98
Discussion
This scoping review summarized current progress on the application of AI and machine learning on HPC clinical diagnosis, treatment, and prognosis. By establishing predictive models and enhancing treatment means, diagnostic accuracy increased and postoperative complications can be better avoided. AI and machine learning are gradually increasing in HPC research.
AI and machine learning are particularly useful for the analysis of large complex datasets, encompassing heterogeneous sources of information. Due to the complex microenvironment at the cellular level and long follow-up period in HPC patients, the utilization of AI on HPC is appropriate to gain new knowledge.99 A cross-sectional review for the management of HPC is crucial for patient outcome and the reduction of disease burden.
Multi-omics approaches are urgently needed in identifying HPC heterogeneity and biological features underlying cancer pathology. However, current studies are all based on small sample sizes and single sequencing methods. Integrative multi-omics analysis with AI assistance can better guide precision therapy of HPC patients.
There are some limitations in this review. First, due to the complicated algorithms of AI, we cannot interpret the established models into characteristics that can be figured by humans. The underlying features of medical imaging remain to be explained. Second, how to promote the AI models on a national or global scale might be a future aspect, and a large patient cohort is still lacking.
Conclusions
AI/machine learning is undeniably a scientific field that is in the spotlight, especially in the last decades, and its utilization in medical applications of HPC research is on the rise. Big data from multi-center and standardized databases are needed for model training by AI techniques, and AI-based diagnostic or predictive models are eagerly anticipated to solve clinical dilemmas of every HPC stages.
Footnotes
Disclosures: The author has reported no conflicts of interest or funding for this work.
- Received September 23, 2024.
- Revision received August 15, 2025.
- Accepted August 22, 2025.
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