Although a final decision whether ApoC1 or LuzP6—or even both—generate the mass spectrometric peak at 6433 Da cannot be drawn from the results, the well-described functions of ApoC1 in lipoprotein metabolism and differentiation of macrophages, as well as the abundant positive immunostaining of LuzP6, warrant further research concerning glioblastoma cyst formation and glioblastoma pathogenesis in view of potential glioblastoma biomarkers. Here, APOC1 is linked to glioblastoma.