This 2-arm randomized trial assessed the incremental effect of providing a lecture on Internet use followed by participation in an Internet-based peer support group following a week-long rehabilitation program, over and above any possible general effect of participation in the rehabilitation program.

Primary outcome measures are adjustment to cancer and mood disturbance.

Inclusion Criteria:

• Cancer survivors who were randomized for or self-selected to a rehabilitation course at the Dallund Rehabilitation Centre were included in the study.

Exclusion Criteria:

• Rehabilitation course weeks in which cancer survivors over 50 years of age were targeted specifically were excluded.

A total of 66 scheduled rehabilitation course weeks were screened for eligibility between 19 April 2004 and 31 December 2005 from the Rehabilitation Centre Dallund in Denmark. All 58 eligible courses including 921 individuals were enrolled and randomized as 27 case weeks (n = 416 persons) and 31 control weeks (n = 505 persons). Baseline assessments were obtained from 799 individuals. Data from 10 individuals (5 from each treatment group) were subsequently excluded, as they did not attend a rehabilitation course week as planned, leaving final study population of 794 individuals analyzed by 'intention-to-treat' (case: n = 361/794; control: n = 433/794). Participants were followed up for 12 months in accordance with their dates of attendance of the rehabilitation course from 19 April 2004 till 31 December 2006.