To evaluate quality of life in patients after 10 days pause of thyroid medication (Liothyronine) compared to treatment with recombinant TSH (Thyrogen) before radioiodine uptake and treatment in a double-blinded, randomised cross-over design.

Patients with a thyroid follicular or papillary cancer referred to radioiodine treatment in oncological department . The patients after thyroidectomy will be treated with Liothyronine and this treatment will be paused 10 days before radioiodine. As a routine these patients will be re-evaluated with iodine uptake 4 months later.

The patients will be randomised to either T3 pause related to the first radioiodine treatment and Thyrogen injection (recombinant TSH) related to the second treatment/uptake - or Thyrogen related to the first treatment and T3 pause related to the second treatment /uptake.

All medication given in the 10 days period right before radioiodine treatment/uptake will be delivered to the patients and marked with a protocol number. In the period with T3 pause the patients will be given placebo tablets and an injection of saline (instead of Thyrogen) before treatment/uptake at the similar time as given the Thyrogen injection. A nurse otherwise not involved in the study will give the injection.

Patients will be evaluated by VAS, SF-36, and Eortc QLC30 (version 2.0) before radioiodine treatment and 3 weeks after treatment.

Inclusion Criteria:

• Follicular or papillary thyroid cancer

Exclusion Criteria:

• < 18 or > 75 years old
• Pregnant or lactating women