THSD7A and cancer: Caza et al. [50] also analyzed the distribution of the various antigens in a cohort of 1378 biopsies of “primary” MN collected over a five-year period at Arkana laboratories.Of the 111 biopsies of cancer-associated MN, 42 were with unknown antigen, 35 were PLA2R positive, 30 were NELL1 positive, and four were THSD7A positive.