Managing Recurrent Metastatic Head and Neck Cancer

Identification and validation of a novel signature based on T cell marker genes to predict prognosis, immunotherapy response and chemotherapy sensitivity in head and neck squamous carcinoma by integrated analysis of single-cell and bulk RNA-sequencing

T cells are among the most potent anti-tumor cells that are found in humans. Our study sought to develop a reliable signature incorporating T cell marker genes (TMGs) for predicting the prognosis and therapy responsiveness of head and neck squamous cell carcinoma (HNSCC) patients. We downloaded scRNA-seq data from the GSE181919 to identify TMGs. Subsequently, we devised a 12 TMG signature in the TCGA HNSCC cohort by using LASSO analysis. Patients with high-risk scores were shown to experience unfavorable progression-free survival, disease-specific survival, and overall survival, which was validated in the GSE65858 cohort. Additionally, the nomogram integrated risk score and clinical features are more suitable for clinical application. The enrichment analyses of both pathways and functions showed that high- and low-risk patients had functionally related distinctions. Furthermore, analysis of the immunological landscape confirmed that the low-risk patients had a larger percentage of infiltrating immune cells as well as a higher incidence rate of immune-related events. In the meantime, a greater IPS score and expression of immune checkpoint genes suggested significantly favorable responsiveness to immunotherapy in low-risk patients. On the other hand, the high-risk patients had a greater degree of sensitivity to the chemotherapy agents, which included paclitaxel, gemcitabine, docetaxel, and cisplatin. Our finding revealed that this TMG signature independently functioned as a prognostic marker and guided individualized immunotherapy and chemotherapy selection for patients with HNSCC.

The Evolving Role of Stereotactic Body Radiation Therapy for Head and Neck Cancer: Where Do We Stand?

Stereotactic body radiation therapy (SBRT) is a precise and conformal radiation therapy (RT) that aims to deliver a high dose of radiation to the tumor whilst sparing surrounding normal tissue, making it an attractive option for head and neck cancer (HNC) patients who are not suitable for the traditional long course of RT with comprehensive RT target volume. Definitive SBRT for HNC has been investigated in different settings, including early stage glottis cancer, and as an alternative to brachytherapy boost after external beam RT. It is also used as a primary treatment option for elderly or medically unfit patients. More recently, an SBRT combination with immunotherapy in the neoadjuvant setting for HNC showed promising results. Salvage or adjuvant SBRT for HNC can be used in appropriately selected cases. Future studies are warranted to determine the optimum dose and fractionation schedules in any of these indications.

Liquid biopsy in head neck cancer: ready for clinical routine diagnostics?

PURPOSE OF REVIEW

The bodily fluids of patients with solid cancers representing a minimally-invasive source of clinically exploitable biomarkers have attracted an increasing amount of attention in recent years. In patients with head and neck squamous cell carcinoma (HNSCC), cell-free tumour DNA (ctDNA) belongs to the most promising liquid biomarkers for monitoring disease burden and identifying patients at high risk of recurrence. In this review, we highlight recent studies, evaluating the analytical validity and clinical utility of ctDNA as a dynamic biomarker in HNSCC, especially as it relates to risk stratification and contrasting human papilloma virus (HPV+ and HPV-) and carcinomas.

RECENT FINDINGS

The clinical potential of minimal residual disease monitoring through viral ctDNA in identifying HPV+ oropharyngeal carcinoma patients at higher risk of recurrence has recently been demonstrated. Furthermore, accumulating evidence supports a potential diagnostic value of ctDNA dynamics in HPV-negative HNSCC. Altogether, recent data suggest that ctDNA analysis may be a valuable tool in guiding (de)escalation of surgical interventions as well as adaptation in radiotherapy dosage, both in the definitive and adjuvant settings.

SUMMARY

Rigorous clinical trials with patient-relevant endpoints are critical in order to demonstrate that treatment decisions based on ctDNA dynamics result in better outcomes in HNSCC.

Clinical practice guidelines for the management of recurrent head and neck cancer: a systematic review and quality appraisal

PURPOSE

Recurrent head and neck cancer (HNC) has a significant global disease burden and its treatment is complex. Multiple clinical practice guidelines (CPGs) have been developed to improve management of these patient populations; however, no study has systematically reviewed the quality and rigor in development of these guidelines. Here, we identify and systematically appraise existing recommendations for the management of recurrent HNC and assess their clinical applicability, methodologic rigor, and transparency of development.

METHODS

A systematic search of the PubMed, Embase, and Scopus databases was conducted for recurrent HNC CPGs. Each guideline was scored independently by four reviewers trained in the Appraisal of Guidelines for Research and Evaluation, 2nd edition (AGREE II) methodology. Salient recommendations from the selected guidelines were summarized.

RESULTS

Our literature search yielded 1799 articles; after iterative title/abstract and full text screening, five remaining guidelines met inclusion criteria. CPGs received the lowest scores in 'Applicability' and 'Rigor of development,' with scores of 12.9% and 22.3%, respectively. Overall quality of available guidelines for management of recurrent HNC is poor, with an average overall scaled domain score of 40.9% (± 11.0), and with four guidelines (80.0%) receiving an overall quality rating of 'low'.

CONCLUSION

We found significant variability in quality and overall lack of methodologic rigor among available guidelines for the management of recurrent HNC. Future groups developing recommendations for this purpose should implement the AGREE II framework to improve quality and standardization of their guidelines.

Case report: Patient specific combination of surgery and immunotherapy in advanced squamous cell carcinoma of the head and neck - a case series and review of literature

BACKGROUND

Prognosis of patients with recurrent or metastatic head and neck cancer is generally poor. Adjuvant immunotherapy (IT) featuring immune checkpoint inhibition (ICI) is standard of care in advanced stage head and neck squamous cell carcinoma (HNSCC) and cutaneous squamous cell carcinoma (CSCC). ICI response rates in CSCC are described as higher than in HNSCC. IT is constantly shifting into earlier disease stages which confronts the surgeon with immunotherapeutically pre-treated patients. It is therefore becoming increasingly difficult to assess which patients with symptomatic tumor disease and a lack of curative surgical option might benefit from salvage surgery.

CASE PRESENTATIONS

The following 6 cases describe therapeutic decision-making regarding ICI and (salvage) surgery in patients with advanced stage HNSCC or CSCC. Cases A and B focus on neoadjuvant ICI followed by salvage surgery. In Cases C and D salvage surgery was performed after short-term stabilization with partial response to ICI. The last two cases (Cases E and F) address the surgical approach after failure of ICI. All cases are discussed in the context of the current study landscape and with focus on individual decision-making. For better understanding, a timetable of the clinical course is given for each case.

CONCLUSIONS

ICI is rapidly expanding its frontiers into the neoadjuvant setting, frequently confronting the surgeon with heavily pretreated patients. Salvage surgery is a viable therapeutic concept despite the rise of systemic treatment options. Decision-making on surgical intervention in case of a salvage surgery remains an individual choice. For neoadjuvant ICI monitoring regarding pathological tumor response or tumor necrosis rate, we suggest correlation between the initial biopsy and the definite tumor resectate in order to increase its significance as a surrogate marker. Scheduling of neoadjuvant ICI should be further investigated, as recent studies indicate better outcomes with shorter time frames.

Clinical Characteristics and Predictive Outcomes of Recurrent Nasopharyngeal Carcinoma-A Lingering Pitfall of the Long Latency

Purpose: To investigate the clinical characteristics, risk factors, and clinical outcomes of long-latent recurrence (>five years) of nasopharyngeal carcinoma (NPC). Methods: This retrospective study enrolled newly diagnosed NPC patients from the Chang Gung Research Database between January 2007 and December 2019. We analyzed the patients’ characteristics and survival outcomes after recurrence. Results: A total of 2599 NPC patients were enrolled. The overall recurrence rate was 20.5%, while 8.1% of patients had long-latent recurrence (>five years). These patients had a higher percentage of initial AJCC (The American Joint Committee on Cancer) stage I/II (60.5%, p = 0.001) and local recurrence (46.5%, p < 0.001). Unresectable rT3 and rT4 were found in 60% of patients when recurrence and 30% of local recurrence occurred in the skull base, which could not be detected by the regular endoscopy. The five-year overall survival rate of long-latent recurrence was 19.7%. Alive patients tended to be asymptomatic but have regular follow-ups with the interval less than six months. Multivariate analysis showed age and initial advanced AJCC stages were independent risk factors of death after recurrence. In contrast, patients with recurrence between two and five years, salvage surgeries, and regional recurrence had favorable survival outcomes. Conclusion: Long-latent NPC recurrence is not rare, and the survival outcome is poor. Regular follow-up for early detection of NPC recurrence is necessary even after five years of disease-free period.