Please clarify whether you were placed with Private or Govt Sector.
If Private Sector please submit a detailed request letter with proper medical proof (Doctor certificate /lab reports confirming the illness). The letter may be addressed to your Head of Dept with copy to HR. The content of the letter can be
I would like to humbly present the following for your kind consideration.
Very recently I have been diagnosed with Papillary Thyroid Cancer w/ LN Mets Stage 3 and the copy of Doctor certificate/Lab reports is attached herewith.
In the light of the above, I hereby request you to transfer me from ___(current dept name) to _________(new dept name) as I will have to undergo _______(brief here about treatment details).
I hope my request for transfer to _______ (dept name) will be considered on humanitarian basis.
25th April 2019 From India, Madras