Descriptors and Predictors of Burden and Information Needs

Eligible patients will be invited to take part in the study via a patient information sheet. They will also be asked to nominate their primary caregiver, who will also be invited to take part in the study. We will give patients and caregivers 24 hours to decide whether they want to take part or not. If they do decide to take part, all research participants will be involved in the study on four consecutive occasions before, during and after their treatment. These four time points will be the following:

• before first fraction of RT
• 1st week of RT (1st-5th faction)
• 2nd week of RT (6th-10th fraction)
• 1 month after the last fraction of RT The principal researcher, i.e. Saengrawee Thanthong, will endeavour to collect questionnaires in the hospital. If participants cannot come to the hospital to receive radiotherapy or for their follow up appointment and complete the questionnaire, then the principal researcher will call them and offer to complete the questionnaires over the phone so as to minimise missing data due to attrition.

Inclusion criteria

• Inclusion criteria for patients:

• Histological diagnosis of Lung cancer with stage III-IV(TNM)
• Age: 18 years or over
• Planning for palliative RT
• Scheduled to receive up to 10 fractions of palliative radiotherapy (Stevens, Macbeth, Toy, Coles, & Lester, 2015)

• Exclusion criteria for patients:
• Non-English, Non-Thai speaking
• Diagnosis of severe cognitive or mental illness that affects communication

Patients' family caregivers will also be invited to participate as per below:

• Inclusion criteria for caregivers:

• Family member of the care recipient can be spouse, child, parent, friend etc.
• Age: 18 years or over
• Only one family member if the patient presents with more than one.
• Same person in every time point
• Exclusion criteria for caregivers:

• Non-English, Non-Thai speaking