FCN2 and infection: Interestingly, among the nine patients (of 161 followed-up for at least 6 months from the MM or LYMPH group) who experienced severe infections after hospital discharge, six (including three of four non-survivors) had low ficolin-1 serum concentration before chemotherapy, four (two non-survivors) had low ficolin-2, and four (two non-survivors) had low ficolin-3 levels.