Best prognosis is seen in -
Carcinoma of oral cavity 

Most common type of Carcinoma of oral cavity is squamous cell carcinoma
In the oral Cavity, tongue (30%) is the most common site followed by lip (17.4%) and the floor of mouth (16.4%)
The mortality from squamous Carcinoma also varies by site in the mouth, with the lowest mortality from lip Cancer and the highest for Cancer of the Tongue.
Ca lip
Ca tongue
Ca palate
Ca floor of mouth