Since 2010, the field of immunotherapy has grown substantially, leading to a growing population of long-term cancer survivors treated with immunotherapy. Since cancer survivorship in immunotherapy is an emerging field, to date not much is known about psychosocial and neurocognitive survivorship-related issues in advanced cancer survivors treated with immunotherapy. Preliminary findings indicated significant psychosocial and cognitive problems in survivors of advanced melanoma persist after treatment with immunotherapy. The objective for this project is twofold. First, the investigators want to longitudinally identify survival-related problems in survivors of advanced cancer treated with immunotherapy. The second goal is to identify the efficacy of an Integrative Neuro-Cognitive Remediation Therapy (INCRT) program. The investigators will focus on the following outcomes: (1) Psychosocial consequences, such as emotional complaints, fatigue, fear of recurrence, (2) neurocognitive functioning, and (3) health-related quality of life. The INCRT combines personalized computerized cognitive training and neurocognitive strategy training, with group sessions of exercise, mindfulness, Acceptance and Commitment Therapy, and cognitive behavioral therapy. We will have three cohorts: * Cohort 1: advanced cancer survivors treated with immunotherapy * Cohort 2: cancer survivors treated with cancer therapy of any kind (excluded immunotherapy), and who have subjective complaints and/or objective cognitive impairment * Cohort 3: cancer survivors of a central nervous system (CNS) tumor, who do not have active disease in the CNS, and who have subjective complaints and/or objective cognitive impairment In the first part of the study, survival-related problems will be evaluated in cohort 1, in a longitudinal manner by means of a semi-structured interview at baseline, various questionnaires and a computerized neuropsychological test battery. In the second part of the study, patients of cohort 1, 2 and 3 with subjective or objective cognitive dysfunction can follow the INCRT program. The efficacy of the INCRT is evaluated through a pre-INCRT and post-INCRT evaluation. This evaluation consist of several questionnaires and neuropsychological tests. Long-term efficacy will be evaluated by a follow-up evaluation six months after completion of the INCRT program.