PTAA and B10: new approaches to amyloid detection in tissue-evaluation of amyloid detection in tissue with a conjugated polyelectrolyte and a fibril-specific antibody fragment

Methods: aEuro integral We compared the amyloid detection of PTAA and B10 to Congo red in 106 amyloid-containing tissue biopsies of diverse anatomical and precursor origin by evaluating the accordance in four grades (grade 0: no staining, grade 1: staining of < 33%% of the amyloid deposits, grade 2: 33--66%% and grade 3: aEuroS > 66%%). Results: aEuro integral PTAA showed grade 2--3 staining in 57 (54%%) cases, while B10 presented this accordance in only 25 (24%%) tissue biopsies. Grade 1 staining was found in 11 (10%%) samples with PTAA and in 62 (58%%) cases with B10. No staining at all (grade 0) occurred in 38 (36%%) biopsies when using PTAA and in 19 (18%%) cases when using B10. Conclusion: aEuro integral Although conformation-sensitive detection seemed promising, PTAA and B10 stain only a fraction of the examined amyloid samples when using routine surgical pathology settings. This study emphasises the necessity of having optimised pre-analytical protocols for recovery, storage and handling of samples if these novel amyloid ligands are to be used in routine diagnosis of amyloid.