1. Number of Natural Killer Cells (Time Frame - Change from pre Intervention to immediately after intervention and 1 hour post intervention): NK cells, subgroups and innate lymphoid cells
Secondary outcome:
1. Subjective Quality of Life (Time Frame - Once after intervention): Quality of Life (EORTC QLQ-C30, questionnaire score from 0 - 100, higher score = better quality of life)
2. Fatigue (Time Frame - Once after intervention): Fatigue (EORTC QLQ FA12 Fatigue questionnaire range 0 - 100, higher score = worse outcome)
3. Nutritional status (Time Frame - Once after intervention): Mini Nutritional Assessment (MNA range 0 - 14 points), lower score = worse