Complete the following sentence

Complete the following sentence with a (compound) word derived from the one(s) given in bracket.

Terminal lung cancer is controllable but （ ）.(curable)

根据前文but，可判断，空格处与but前的controllable词性一致但意思相反，controllable是形容词，所以要填形容词，根据意思，可控制但是...前为正向的形容词，后为负向的形容词。所以填incurable不可治愈的。句意：晚期肺癌可以控制病情但无法被根治。