Costs of cancer treatment per month, cancer stage and treatment phase.

CIS: Carcinoma in situ.
Similar monthly costs of the initial phase were found between DCIS and stage I, and between stages II and III.
The duration of the follow-up phase included the time from surgery until a maximum of 10 years, i.e. follow-up was calculated as 10 years (120 months) minus the duration of the initial phase except the first month.
The duration of follow-up for women assigned to have a recurrence was sampled from a Uniform distribution from the end of the initial phase to the end of the follow-up phase.
The costs of metastatic cancer were similar, regardless of whether the tumour was an initial stage IV cancer or a recurrence. Its duration was for the lifetime.