Randomized Study Regarding Preventive Jaw- and Swallowing Intervention for Patients With Head and Neck Cancer

Jaw opening measured in millimeters. A MIO <36 mm is considered as trismus. i.e. limited jaw-opening.

Swallowing ability measured with Functional Endoscopic Examination of Swallowing (FEES)

Patient Reported Outcomes (PRO) measured with Gothenburg Trismus Questionnaire (GTQ). The GTQ consists of 21 items divided into 3 domains; Jaw related problems, Eating limitations and Muscular tension and eight single items concerning facial pain, limitations in mouth opening and inabilities to function on social and working contexts. The GTQ domains range from 0-100 where 0 equals to absence of symtoms and 100 equals worst possible symptoms.

PRO measured with M.D Anderson Dysphagia Inventory (MDADI). This is a cancer-specific instrument measuring dysphagia, social function and quality of life in head and neck cancer patients. It consists of 19 items in four domains; emotional, physical, functional and global quality of life. The range for each subscale is 20-100 where 100 indicates best possible swallowing, i.e. better outcome.

Measured with the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ) core questionnaire (c30). Consists of 30 items divided into six functional domains (Physical, Role, Cognitive, Emotional, and Social Functioning and Global Quality of life), three symptom scales (Fatigue, Pain, and Nausea/Vomiting) and six single items (Constipation, Diarrhea, Insomnia, Dyspnea, Appetite Loss, and Financial Difficulties). All domains range from 0-100. For the functional domains a higher score indicates good function, while for all other domains a high score indicates a high prevalence of symtoms, i.e. worse HRQL.

Measured with the EORTC QLQ Head and neck module (HN35). It consists of 35 questions regarding symptoms more specific to the head and neck cancer population, and domain scores range from 0-100, where a higher score represents the prevalence of more symtoms, i.e. worse HRQL.

Swallowing ability measured with FEES

Jaw opening measured in millimeters

The cost of intervention compared to usual care. Costs in Swedish crowns (SEK) for the intervention and all visits to healthcare during 5 years will be recorded.

The outcomes of intervention compared to usual care using European Quality of life 5 dimensions (EQ5D).

QALY is a measurement that combines health-related quality of life (HRQL) and life expectancy in one index. The index range between 0 and 1, where 0 equals death and 1 represents perfect health. Thus, 1 QALY corresponds to 1 year of perfect health. This is calculated using the EQ-5D.

Incremental cost for each QALY for the intervention group will be calculated using a Markov model which combines the costs and EQ-5D. The ICER will then be compared to the maximum willingness to pay level which is SEK 500,000 (€55,000) according to the Swedish National Board of Health and Welfare.