E, The concentration of plasma INSL5 in healthy controls (normal EBV (-)), non-tumor individuals with VCA-IgA positive (normal EBV (+)) and NPC patients, in validation cohort 1(GZ). F, The concentration of plasma INSL5 in healthy controls (normal EBV (-)), non-tumor individuals with VCA-IgA positive (normal EBV (+)) and NPC patients, in validation cohort 2(ZS). 