{"id":3335,"date":"2026-08-28T08:12:42","date_gmt":"2026-08-28T07:12:42","guid":{"rendered":"https:\/\/seamlessbio.de\/?page_id=3335"},"modified":"2026-08-28T08:14:55","modified_gmt":"2026-08-28T07:14:55","slug":"what-is-human-tissue-biomarker","status":"publish","type":"page","link":"https:\/\/seamlessbio.de\/de\/what-is-human-tissue-biomarker\/","title":{"rendered":"What is Human Tissue for Biomarker Research?"},"content":{"rendered":"
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Quick Definition<\/p>\n

What is Human Tissue for Biomarker Research?:<\/strong> Human tissue for biomarker research refers to biopsy or surgical specimens from human donors \u2014 collected, processed and stored under defined conditions for use in biomarker discovery, assay development, IHC\/ISH validation, and companion diagnostic development. The two primary formats are fresh frozen tissue (snap-frozen at \u221280\u00b0C for protein and nucleic acid extraction) and FFPE (formalin-fixed, paraffin-embedded) tissue for histological and immunohistochemical analysis.<\/p>\n<\/div>\n\n

Fresh frozen vs FFPE tissue \u2014 when to use which<\/h2>\n\n
Parameter<\/th>Fresh Frozen<\/th>FFPE<\/th><\/tr>\n
Protein integrity<\/td>\u2705 Excellent \u2014 native conformation preserved<\/td>\u26a0\ufe0f Crosslinked \u2014 antigen retrieval required for IHC<\/td><\/tr>\n
RNA quality<\/td>\u2705 High RIN \u2014 suitable for RNA-seq, qPCR<\/td>\u26a0\ufe0f Degraded \u2014 short amplicons required, FFPE-specific kits<\/td><\/tr>\n
Morphology<\/td>\u26a0\ufe0f Freezing artefacts \u2014 not suitable for standard histology<\/td>\u2705 Excellent \u2014 standard H&E, IHC, ISH<\/td><\/tr>\n
Lagerung<\/td>\u221280\u00b0C \u2014 expensive long-term<\/td>Room temperature \u2014 indefinitely stable<\/td><\/tr>\n
IHC\/ISH<\/td>\u26a0\ufe0f Possible but suboptimal \u2014 cryosections<\/td>\u2705 Standard format \u2014 4 \u00b5m sections on APES-coated slides<\/td><\/tr>\n
Proteomics<\/td>\u2705 Full protein extraction<\/td>\u26a0\ufe0f Crosslinking reduces recovery \u2014 specialised extraction needed<\/td><\/tr>\n
Companion diagnostic development<\/td>\u26a0\ufe0f Not standard clinical format<\/td>\u2705 Standard \u2014 CDx assays validated on FFPE<\/td><\/tr>\n
Biomarker discovery<\/td>\u2705 Preferred for discovery phase<\/td>\u2705 Validation phase \u2014 retrospective archives<\/td><\/tr>\n<\/table>\n\n

CSF \u2014 cerebrospinal fluid as a speciality biomarker matrix<\/h2>\n

Cerebrospinal fluid (CSF) is produced by the choroid plexus and circulates around the brain and spinal cord. It reflects the biochemical state of the central nervous system more directly than blood \u2014 making it the primary matrix for CNS biomarker assays. CSF is collected by lumbar puncture (spinal tap) under sterile conditions \u2014 a more invasive procedure than blood draw, which limits the volume available and requires specialist collection.<\/p>\n

Key CSF biomarkers in current IVD use: total tau and phospho-tau 181 (neuronal damage and tangle formation in Alzheimer's disease), amyloid-\u03b242 and amyloid-\u03b242\/40 ratio (amyloid plaque burden), neurofilament light chain NFL (axonal damage \u2014 elevated in ALS, MS, Parkinson's, traumatic brain injury), and GFAP (astrocyte damage). These analytes are present at pg\/mL to ng\/mL concentrations in CSF, requiring highly sensitive immunoassay platforms.<\/p>\n\n

IgG-depleted and steroid-depleted serum \u2014 when needed<\/h2>\n

IgG-depleted serum<\/strong> is human serum from which immunoglobulins have been removed by Protein A\/G affinity depletion. Standard human serum contains 8\u201312 mg\/mL IgG \u2014 at these concentrations, IgG dominates the protein background and can interfere with sandwich immunoassays for low-abundance biomarkers where IgG occupies non-specific binding sites. IgG-depleted serum provides the albumin, transferrin, and other matrix proteins of human serum without the IgG background \u2014 useful as a calibrator diluent for assays where endogenous IgG would otherwise confound the calibration curve.<\/p>\n

Steroid-depleted serum<\/strong> is human serum from which steroid hormones (estradiol, testosterone, progesterone, cortisol, DHEA) have been removed by charcoal-dextran adsorption. It is used as the zero-calibrator matrix for steroid hormone immunoassays \u2014 ensuring that the blank calibrator contains no endogenous hormone that would create a non-zero baseline.<\/p>\n\n

HAMA interference \u2014 why it matters for tissue-based research<\/h2>\n

Human Anti-Mouse Antibodies (HAMA) are antibodies in human serum that recognise murine IgG. HAMA are produced by patients who have been exposed to mouse antibodies \u2014 through diagnostic imaging (radiolabelled murine antibodies), cancer therapy (murine mAb), or laboratory accidents. HAMA interfere with sandwich immunoassays that use murine capture and detection antibodies \u2014 the HAMA bridges the two antibodies creating a false positive signal. HAMA-positive serum is a required interference material for performance evaluation of any IVD that uses murine antibodies in a sandwich format. SeamlessBio supplies HAMA positive and HAMA high positive serum for interference testing.<\/p>\n\n

Key Facts<\/h2>\n