This is not early Ca
is most curable when it is diagnosed and treated in stage 1 or 2.
Stage 3 can also be treated but the cure rates are not as high as earlier stages. In your situation, your husband needs more treatment using chemotherapy(it is called adjuvant chemotherapy). With using all the modern treatments, he has a better than 50/50 chance to survive his cancer...So i would be optimistic but be watchful.