Table 1 In- and exclusion criteria

Inclusion criteria

 1) Women who are 18 years or older.

 2) Treated for breast cancer with curative intent.

 3) Breast cancer treatment (surgery, chemo- and/or radiotherapy) must be finished at least 3 months previously. There is no upper limit for the time since completion of cancer treatment. Patients who currently receive hormone and/or targeted therapy are eligible.

 4) Disease-free at entry of the study, defined by the absence of somatic disease activity parameters.

 5) Able to speak, read, and write Dutch.

 6) Severely fatigued, defined by a score of ≥35 on the fatigue severity subscale of the Checklist Individual Strength.

 7) Having access to a computer with internet.

Exclusion criteria

 8) Presence of a co-morbidity that explains the presence of severe fatigue.

 9) A depressive disorder, assessed with the BDI-PC and the M.I.N.I.

 10) Current psychological treatment for a psychiatric disorder.

 11) Current CBT for fatigue.