Reference Standards

Cell Line IHC Quality Controls

Why settle for unpredictable surgical residuals? Deploy molecularly characterized cell lines to establish consistent stain calibration of primary pathology runs.

Clinical Patient Risk

The Danger of False Negatives

Histology workflows involve over 20 manually prepared chemical reagents. If antigen retrieval or primary antibody concentrations drift even slightly:

Uncontrolled Drift Risk Unvalidated Failure

Result: A pathologist might incorrectly score a patient as protein expression negative, denying critical therapeutic eligibility.

Reproducible IHC with Calibrated Standards

In modern immunohistochemistry (IHC), staining accuracy is paramount. Clinicians rely on biomarker scores like HER2 expression, MMR mismatch deficiencies, and PD-L1 thresholds to determine targeted immunotherapy candidates.

Yet, historically, pathology laboratories verified runs using leftover tissue scraps from surgical resections. These residual tissues suffer from massive biological variance, unknown molecular thresholds, and rapid cell degradation. By standardizing runs against uniform cloned cell plugs, laboratories establish baseline controls, validating workflow integrity and protecting patient safety.

Our Innovation

Engineered Clones vs. Resection Residuals

Why clinical pathology centers are adopting our synthetic reference standards.

Traditional Scrap Tissue Controls

  • ✕ Highly variable tissue architecture and thickness boundaries.
  • ✕ Unstable molecular profiles with high batch-to-batch variation.
  • ✕ Lacks zero-expression (absolute NULL) baseline references.
  • ✕ Incompatible with high-throughput quantitative machine learning.

PCI Cell Line Reference Plugs

  • ✓ Surgically consistent cell densities and homogeneous distribution.
  • ✓ Clonally sequenced genomes carrying precise expression spectrums.
  • ✓ Guaranteed negative (NULL) and overexpression (3+) standards on one block.
  • ✓ Calibrated specifically for digital AI scanners and automated scoring.
Material Formats

Tailored for Every Validation Workflow

Choose between primary blocks or pre-cut slides to match your throughput.

Format A

FFPE Blocks

Formalin-Fixed Paraffin-Embedded cellular block containing homogeneous cell plugs spanning the entire block depth. Highly scalable for high-volume pathology institutions.

  • • Yields 150 - 200 cuts per block
  • • Cut at 4-5 microns per lab's microtome
  • • Excellent for custom antibody development

BEST FOR:

Validation, customized assays, high volume runs.

Format B

Pre-Cut Slides

Pre-mounted 4-micron thick cellular cuts placed on charged silicate adhesive glass. Placed on the bottom section of grease-free glass, leaving the rest free for immediate local placement of patient resections.

  • • Pre-baked, direct stain ready
  • • 18 months room-temperature shelf-life
  • • No microtome cuts equipment needed

BEST FOR:

Routine run validations, quality reviews, training classes.

Calibration Layouts

The Molecular Gradient Spectrum

Our products organize distinct cell plugs next to each other, creating visual and quantitative density steps.

TriControl™ Staining Thresholds Spectrum (p53 Example)

NULL

Pellet A: mutated

Stain Score: 0 (Negative)

WT

Pellet B: Wildtype

Stain Score: 1-2+ (Hetero)

HIGH

Pellet C: Mutant

Stain Score: 3+ (Overexpressed)

Each plug contains a dense sequence-characterized population. Pathologists and computer systems (QuPath extension/AI engines) look at this sequence of plugs to verify the dynamic range.

Regulatory Reference

Supported Biomarkers

A map of the clinical pathways and corresponding PCI quality products.

Biomarker Diagnostic Path / Clinic Relevance Positive Target Patterns Target Catalog Codes
p53 High mutation rate biomarker in ovarian, colon, and breast carcinomas. Nuclear translocation, extreme wildtype patchy stains. PCI-FFPE-P53 | PCI-SLD-P53
MMR Panel Mismatch proteins MLH1, MSH2, MSH6, PMS2 for Lynch syndrome detection. Intact nucleolar structures vs complete target gene loss. PCI-FFPE-MMRQ | PCI-SLD-MMRQ
PD-L1 Immunotherapy eligibility threshold validation across lung cancers. Uniform circular cellular membrane staining. PCI-FFPE-PDL1H | PCI-SLD-PDL1H
HER2 Companion score testing for anti-HER2 therapies in breast tumours. Strong circular circumferential membrane borders. PCI-FFPE-HER2 | PCI-SLD-HER2-AMP
p16 HPV infection indicator used high specificity uterine cervix biopsy scores. Block nuclear cytoplasmic staining profiles. PCI-FFPE-P16 | PCI-SLD-P16
PTEN Tumor suppressor loss detection used breast, renal and prostate cancer logs. Cytoplasmic retention vs total genomic signal deletion. PCI-FFPE-PTEN
BRAFV600E Melanoma mutations screening validations in somatic biopsies. Localized cytoplasmic VE600 mutant immunostains. PCI-FFPE-BRAF
MYC Burkitt and High Grade B-cell Lymphoma nuclear oncogene monitors. Absolute nuclear structural expression peaks. PCI-FFPE-MYC
PR Progesterone steroid receptor expression maps for breast cancers. Stable nuclear binding markers. PCI-FFPE-PR
RB / FOLR1 Ovarian carcinomas targets and lung endocrine loss evaluations. Dynamic membrane receptor profiles and suppression grids. PCI-FFPE-RB | PCI-FFPE-FOLR1

Access High-Throughput Standards Today

Deploy sequence-characterized validation blocks and Slides in your primary IHC staining queues.

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