Only the study team can determine whether someone qualifies for participation.
Inclusion criteria
Adults aged 20 years or older with full legal capacity. Diagnosed with any type of cancer and currently receiving chemotherapy as an inpatient or at the Tri-Service General Hospital breast surgery outpatient clinic.
Able to understand Chinese or Taiwanese and able to read and operate a smartphone or tablet.
Willing to participate in the study and accept random assignment. Have access to a personal mobile device capable of accessing the study materials.
Exclusion criteria
Severe psychiatric disorders, such as schizophrenia or bipolar disorder, or neurodegenerative diseases, such as moderate or severe dementia.
Clinical deterioration or poor prognosis requiring a change in treatment or transition to palliative or hospice care.
Concurrent participation in another psychological intervention study that may affect emotional outcomes.
Deemed unsuitable for breathing training or receiving prolonged sedation.