But the group hit pay dirt a year later when they found that a gene called B-RAF was mutated in about 70 percent of the malignant melanoma cases they examined.

• 然而一年后，他们就采到了金矿：他们在将近70%25的恶性黑色素瘤中，发现一个名叫B-RAF的基因都发生了突变。