Marvin Humes is urging men to take part in a lifesaving study that hopes to determine why black men are more at risk of prostate cancer.MORE: Marvin Humes shares sweetest father-son moment with baby BlakeThe father-of-three is backing a UK study which aims to explain why black men develop prostate cancer at twice the rate of other men, and the JLS star is encouraging men from the black community to find out whether they are eligible to take part in the trial, which is funded by Movember and