Some people enjoy healthy and happy lives after completion of successful treatment. However, sometimes the treatment can cause severe effects in a person's life-extending till months or even years. Some post-treatment side effects are not evident even after years of treatment. These are known as late effects. Treatment with radiotherapy or chemotherapy has higher risks of forming side effects like myelodysplastic syndrome and other secondary cancers, including melanoma and leukaemia (a form of skin cancer).