The paper presents the results of a cooperative, retrospective study of mycosis fungoides in Norway, in 112 patients diagnosed histologically between 1960-80. The study includes an analysis of incidence, clinicopathological findings, survival, mortality and autopsy findings. In addition, other factors, such as occupation, the incidence of cancer, associated illnesses and contact allergies are reviewed. The significant prognostic variables with regard to survival included, age at diagnosis, stage of the disease at diagnosis and occupation. Industrial workers showed the highest incidence of MF and the poorest prognosis in terms of survival after biopsy. In 59% of deceased MF patients, the cause of death was related to MF.