The prediction of death from cancer by means of personality/stress questionnaire: too good to be true?

Recent work by Grossarth-Maticek and Eysenck has suggested that there are personality traits which in combination can predict cancer in healthy probands with 81% accuracy. Many critics have considered this result "too good to be true." It is shown that earlier studies have given results not very different in accuracy, suggesting that such a criticism is unwarranted.