well i think it should be uvula cuz soft palate has to be sensitive to touch to elicit a gag reflex... tip of the tongue aint as imp a site for extra touch receptors as the soft palate.
Small cell Ca. of lung is the most common Ca. associated wid paraneoplastic syndrome... mainly acts as a source of exogenous ACTH and also causes SIADH and probably also secretes PTH like proteins (not sure) which causes hypercalcemia.