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It is universally acknowledged that nucleic acids extracted from FFPE tissues are prone to degradation and cross-linking. However, the prevailing model assumes this degradation is a random, stochastic process resulting in a Gaussian distribution of fragment sizes—a model that underpins…
Extracting high-quality, high-purity DNA and RNA from aged FFPE blocks is traditionally viewed as a battle against chemical modification. Standard protocols rely on aggressive, high-temperature enzymatic digestion and harsh solvent deparaffinization. This paper posits that these aggressive methods exacerbate fragmentation.…
The conventional doctrine of paraffin embedding dictates a temperature range of 58°C to 62°C, based primarily on the melting points of standard histological waxes and the need for rapid infiltration. However, from the perspective of a tissue microarray (TMA) constructor,…
Topic: How to effectively avoid tissue wrinkling, tearing, or section loss when cutting FFPE tissue blocks. To the uninitiated, cutting an FFPE tissue block on a microtome seems like a rudimentary mechanical task—like slicing a block of cheese. But to…
Topic: The effects of over-fixation or under-fixation in formalin when making an FFPE tissue block. In nature, amber preserves an insect by trapping it in a rigid, enduring resin, offering a snapshot of deep time. In pathology, formalin is our…
Topic: How to prepare high-quality FFPE tissue blocks from clinical surgical specimens and the standard procedure. For over a century, the preparation of Formalin-Fixed Paraffin-Embedded (FFPE) tissue blocks was viewed as a purely morphological endeavor—a way to pause the clock…
For decades, hospital basements and archives have been filled with millions of FFPE tissue blocks, slowly accumulating under the hum of fluorescent lights. Traditionally, these were viewed as static records—legal documents of a past diagnosis, rarely to be touched again.…
When a surgeon resects a tumor or a suspicious mass, the biological story of that patient’s disease is written in the cellular architecture of the tissue. However, biological tissue is inherently fragile—degradation begins the moment it is deprived of oxygen.…
If the FFPE block is the librarian of clinical pathology, meticulously organizing structural information for long-term reference, then fresh frozen tissue is the raw, pulsating heartbeat of biological discovery. In the relentless pursuit to understand the molecular intricacies of human…
In the sterile, humming environment of a modern hospital pathology laboratory, few objects carry as much weight—both literal and metaphorical—as the FFPE tissue block. Formalin-Fixed Paraffin-Embedded blocks are often viewed through the lens of historical routine, perceived as the dusty…
