The incidence of Thyroid Cancer (TC) has increased over the last thirty years, in France and worldwide. This increase is mainly due to good prognosis microPapillary TC (mPTC). Sixty percent of diagnosed cancers are considered as over-diagnosed, leading to an over-treatment of these cases. The increase of diagnosis of mPTC and its treatment inevitably leads to an increase of medical resources consumption and corresponding costs.

The primary aim of this study is to estimate the cost related to different care management pathway of TC patient during a lifetime period using a multi-state Markov model.

This is a retrospective, observational population based cohort study, using data from a cohort study of TC patients implemented by the ONCOMIP network which initially aimed to perform an audit of clinical practices for the management of TC, and from database of the French social health insurance of Midi-Pyrenees region to calculate observed costs of TC management during 24 months.

Inclusion Criteria:

• all patients with a good prognosis of the TC
• diagnosed in 2014
• whose medical file discussed in MultiDisciplinary Team Meeting (MDTM) in Midi-Pyrenees

Exclusion Criteria:

• patients whose surgical management was carried out outside Midi Pyrenees are excluded and other morphological types are excluded (medullar, anaplastic, lymphomas, sarcomas)

The Evathyr database collected by the Oncomip network: Cohort describing the initial management of 423 patients with TC diagnosed in 2014 and passed in the process of Multidisciplinary Team Meeting (MTM).