please upload TNM stage of the malignancy ( type and extent of tumour) and the exact surgery done. Was PET-CT done to search for metastases?
By the way full
thyroid profile is not necessary. Only
TSH is enough after 12 hours fasting(overnight) and is to be done every 90 days( as your thyroid hormone tablets come in 100 tablet packs) so as to guide the doctor to prescribe accurate hormone replacement each time.