Ten CRC tissue specimens were used for initially checking the BST2 protein levels in tumor cells, followed by a large sample set (132 tissue blocks) for more detailed immunohistochemical analysis.
de Jong et al (1995) found a higher average coefficient of variation (24%) if more than one tissue block was analysed compared to a lower coefficient of variation (15%) when only counts within sections of one block were examined, indicating that a comprehensive inspection of available tumour material is needed to identify the relevant hot spots.
Because data are acquired in 3 dimensions in entire tissue blocks, they provide more powerful insights into any possible structured ordering among fiber tracts ex vivo.
Tissue blocks of no more than 2 mm were immersed in 2.5% glutaraldehyde, treated with formic acid for 24 h and following postfixation on glutaraldehyde, processed for resin (Epon) embedding.
Examples range from development and validation of dietary assessment methods for large population studies [ 16] to collection of blood samples from tens of thousands of study participants [ 17, 18], collection of tissue blocks to provide more detailed classification of endpoints [ 19], and assessment of lifestyle after diagnosis to document relations to cancer survival [ 20].
Although these differences were more pronounced in cells that emigrated from the tissue blocks, they did not reach statistical significance (0.075
More importantly, case control studies may allow for more in-depth translational research, with capabilities to rapidly identify cases, and to obtain tumor tissue blocks and medical record and treatment information in an easier, more timely fashion.
In our experience, LNAB performed with 20-gauge needle retrieves much more tissue than FNA to be processed as paraffin-embedded cell block (Gasbarri et al, 2004).
In contrast, the Compresstome, by virtue of offering more support to the tissue block while cutting, allowed sections to be produced more quickly, with a much faster cutting speed.
