Rahul, sorry to give you the bad news, the chemo did not serve the purpose of reducing/killing the tumor. Almost similar to results that my dad got.

Discuss with oncologist regarding Erbitux, it is an option but very expensive. Alternatively, your father will have to be on palliative chemotherapy for rest of the life. The journey is going to be difficult from here. All the best.

Father; 67 yrs; RIP: 2012/05/26

TX:SCC pT2N1M0G2;Glossectomy+SND+CCRT(59.3Gy+6xCis.)[2009]
TX:Nodal Mets; 3xDCF[2011/05/05]
TX: RND + PMMC Flap[2011/07/11]
DX:SCC PNI+ECE
TX:Re-RT 60Gy[2011/09/21]
TX:Gefitinib 250mg[2011/12/18]