Sir Sam Neill says he is cancer-free and credits a groundbreaking new therapy for it. The 78-year-old New Zealand actor, who lives in Central Otago, was diagnosed with stage three blood cancer four years ago. "I've been living with a particular type of lymphoma. I was on chemotherapy and the pretty miserable business but it was keeping me alive," Neill told 7News. "Then the chemo stopped working. I was at a loss and it looked like I was on the way out, which wasn't ideal, obviously." Sir Sam ultimately underwent CAR T-cell therapy to train his immune cells to recognise and destroy cancer, and the results have been remarkable. The actor - whose film credits include The Hunt For Red October, The Piano, The Dish and Jurassic Park - said: "I've just had a scan just now and there is no cancer in my body. "That's an extraordinary thing. I'm very, very excited that this can happen." He first revealed news of his cancer battle in his book Did I Ever Tell You This?, which he started work on following his diagnosis.…