Trans-Tasman Radiation Oncology Group (TROG) advances head and neck cancer treatment through innovative radiation therapy trials across Australia and New Zealand. Since 1989, TROG has completed over 115 clinical trials improving outcomes for patients with cancers of the pharynx, oral cavity, larynx, and other head and neck sites through cutting-edge radiotherapy techniques.

Website: www.trog.com.au/

Latin American Cooperative Oncology Group (LACOG) unites over 600 head and neck cancer specialists across 17 Latin American countries to conduct clinical trials focused on this region's unique patient population. LACOG investigates new treatments, biomarkers, and therapeutic approaches specifically addressing head and neck cancers prevalent in Latin America, improving access to innovative care.

Website: www.lacog.group/

Canadian Cancer Trials Group (CCTG) leads head and neck cancer research through a network of 2,100+ specialists across Canada and 40 countries. CCTG designs rigorous clinical trials testing new therapies for oral, pharyngeal, laryngeal, and nasopharyngeal cancers, focusing on improving survival while preserving patients' ability to speak, swallow, and maintain quality of life.

Website: www.ctg.queensu.ca/

Fudan University Shanghai Cancer Center (FUSCC) is China's premier head and neck cancer research institution, specializing in nasopharyngeal carcinoma and other head and neck malignancies common in Asian populations. FUSCC pioneers precision medicine approaches, immunotherapy combinations, and molecular diagnostics tailored to head and neck cancers, collaborating internationally to advance treatment worldwide.

Website: www.shca.org.cn/english/

Danish Head and Neck Cancer Group (DAHANCA) has pioneered head and neck cancer treatment since 1976, maintaining one of the world's most comprehensive databases with patient data spanning over 60 years. DAHANCA's radiotherapy protocols and treatment guidelines are internationally recognized and applied worldwide,continuously refined through ongoing clinical trials in oral, laryngeal,and pharyngeal cancers.

Website: www.dahanca.oncology.dk/

European Organisation for Research and Treatment of Cancer(EORTC) coordinates multinational head and neck cancer trials across Europe, testing innovative combinations of surgery,radiotherapy, and systemic therapies. Since 1962, EORTC has shaped global head and neck cancer treatment standards through rigorous studies focused on improving cure rates while minimizing treatment toxicity and preserving patients' speech and swallowing function.

Website: www.eortc.org/ 

Groupe d'Oncologie Radiothérapie Tête Et Cou (GORTEC) brings together 500 head and neck cancer specialists across Europe and North Africa to conduct innovative radiotherapy trials. GORTEC focuses specifically on larynx preservation, organ-sparing approaches, and optimizing radiation techniques for all subsites of head and neck, integrating new approaches in systemic treatments while maintaining patients' quality oflife.

Website: www.gortec.net/

Interdisciplinary Working Group on Head and Neck Tumors (IAG-KHT) unites German surgeons, radiation oncologists, medical oncologists, and pathologists dedicated to head and neck cancer treatment. IAG-KHT develops evidence-based clinical trials and treatment guidelines for oral cavity, laryngeal, pharyngeal, andsalivary gland cancers, emphasizing coordinated multidisciplinarycare.

Website: www.krebsgesellschaft.de/

Hellenic Cooperative Oncology Group (HeCOG) connects 70 head and neck cancer specialists across Greece and Cyprus to advance systemic therapy research. HeCOG conducts trials testing immunotherapy, targeted therapies, and chemotherapy combinations for squamous cell carcinomas of the head and neck, personalizing treatment based on molecular characteristics.

Website: www.hecog.gr/en/

Hong Kong Nasopharyngeal Carcinoma Study Group (HKNPCSG) specializes in nasopharyngeal cancer, which affects Southern Chinese populations at particularly high rates. HKNPCSG conducts clinicaltrials combining radiotherapy, chemotherapy, and immunotherapy specifically for nasopharyngeal carcinoma, addressing this unique head and neck cancer endemic to the region.

Tata Memorial Centre (TMC) leads head and neck cancer treatment and research in India, treating thousands of oral cavity,oropharyngeal, and laryngeal cancer patients annually. TMC pioneers cost-effective treatment protocols adapted to resource-limited settings while conducting cutting-edge trials in HPV-related cancers, tobacco-related malignancies, and organ preservation strategies prevalent inthe Indian population.

Website: www.tmc.gov.in/

Cancer Trials Ireland (CTI) provides Irish head and neck cancer patients access to innovative clinical trials through a nationwide network of specialists. CTI coordinates studies testing new immunotherapies, targeted agents, and radiation techniques for laryngeal, pharyngeal, and oral cancers, ensuring Irish patients benefit from cutting-edge research.

Website: www.cancertrials.ie/

Gruppo Oncologico Nord-Ovest (GONO) conducts independent head and neck cancer research across Italy, focusing on real-world questions facing clinicians. GONO investigates optimal treatment sequencing, de-escalation strategies for HPV-positive cancers, and novel combinations for recurrent/metastatic head and neck squamous cell carcinoma through investigator-initiated trials.

Website: www.gonogroup.org/

Japan Clinical Oncology Group - Head and Neck Cancer StudyGroup (JCOG-HNCSG) leads Japanese multi-institutional trials in head and neck oncology, testing organ-preservation approaches and combined-modality treatments. JCOG-HNCSG specializes in laryngeal preservation strategies, minimally invasive surgical techniques, and optimized chemoradiotherapy regimens for hypopharyngeal,laryngeal, and oral cavity cancers.

Website: www.jcog.jp/en/

Nederlandse Werkgroep Hoofd-Hals Tumoren (NWHHT) unites Dutch head and neck cancer specialists across surgical, radiation, and medical oncology disciplines. NWHHT conducts trials investigating immunotherapy before surgery, sentinel node procedures, and minimally invasive robotic techniques for oropharyngeal, oral cavity,and laryngeal cancers.

Website: www.nwhht.nl/

Grupo de Estudos de Cancro da Cabeça e Pescoço (GECCP) advances head and neck cancer care across Portugal through collaborative clinical trials and education programs. GECCP focuses on early detection of oral cavity cancers, prevention strategies, and testing new treatment approaches for laryngeal, pharyngeal, and thyroid malignancies.

Website: www.geccp.pt/

National Cancer Centre Singapore (NCCS) provides comprehensive head and neck cancer care including advanced proton beam therapy for skull base and nasopharyngeal tumors. NCCS conducts regional trials addressing head and neck cancers common in Southeast Asia, including nasopharyngeal carcinoma, and pioneers precision radiotherapy techniques minimizing toxicity.

Website: www.nccs.com.sg/

Fundación Española de Tratamiento de Tumores de Cabeza yCuello (FETTCC) coordinates Spanish head and neck cancer research across multidisciplinary teams since 2021. FETTCC investigates biomarkers, novel surgical approaches, and personalized treatment strategies for laryngeal, oropharyngeal, and oral cavity cancers, emphasizing functional outcomes and quality of life.

Website: www.ttccgrupo.com/

Swiss Cancer Institute (SAKK) conducts independent head and neck cancer trials across Swiss university hospitals since 1965. SAKK investigates de-intensification strategies for HPV-positive oropharyngeal cancer, immunotherapy combinations, and precision medicine approaches for recurrent and metastatic head and neck squamous cell carcinoma.

Website: www.swisscancerinstitute.ch/

Taiwan Cancer Clinical Research Cooperative Organization(TCOG) coordinates Taiwanese head and neck cancer trials focusing on nasopharyngeal carcinoma and oral cavity cancers prevalent inthe region. TCOG investigates biomarkers, treatment optimization for locally advanced disease, and novel systemic therapies tailored to Asian head and neck cancer populations.

Website: www.tcog.nhri.edu.tw/

UK Head and Neck Cancer Research Group connects British specialists conducting trials in laryngeal, oropharyngeal, and ora lcavity cancers. The group leads studies on HPV-driven malignancies, surgical techniques, radiotherapy innovations, and immunotherapy approaches, coordinating nationwide efforts to improve head and neck cancer survival and quality of life.

NRG Oncology leads landmark head and neck cancer radiotherapy trials through its RTOG legacy, defining treatment standards worldwide. NRG conducts phase III trials testing radiation dose de-escalation for HPV-positive oropharyngeal cancer, novel radioprotective agents, and combined-modality approaches for locally advanced laryngeal and pharyngeal cancers across 1,000+global sites.

Website: www.nrgoncology.org/

ECOG-ACRIN Cancer Research Group advances head and neck cancer treatment through biomarker-driven trials involving 21,000 specialists worldwide. ECOG-ACRIN investigates immunotherapy combinations, circulating tumor DNA monitoring, and precision medicine approaches for recurrent/metastatic head and neck squamous cell carcinoma, integrating advanced imaging and molecular diagnostics into clinical trials.

Website: www.ecog-acrin.org/