QF-Pro Glossary | ScientiaLux

Activating immune checkpoint receptor-ligand pair that promotes anti-tumor immunity when engaged.

Immune Checkpoints & Immunotherapy

Regression of tumors distant from the site of local treatment, mediated by systemic immune activation.

Clinical Applications & Diagnostics

A FRET measurement technique that confirms energy transfer by selectively destroying the acceptor and measuring donor fluorescence increase.

Core Technology & Physics

TSA-enhanced FRET for measuring intramolecular activation states like kinase phosphorylation.

Core Technology & Physics

Natural fluorescence from endogenous tissue molecules that can interfere with exogenous fluorophore detection.

Core Technology & Physics

The fusion protein created by the Philadelphia chromosome translocation, defining chronic myeloid leukemia.

Oncoproteins & Receptor Signaling

The systematic process of establishing analytical validity, clinical validity, and {{clinical-utility|clinical utility}} for a biomarker assay.

Clinical Applications & Diagnostics

A kinase in the MAPK pathway, frequently mutated in melanoma (V600E) and other cancers.

Oncoproteins & Receptor Signaling

The most common cancer in women, where protein interaction states (HER2-HER3, Akt activation) predict outcomes beyond expression levels.

Clinical Applications & Diagnostics

T cells genetically engineered to express chimeric antigen receptors targeting tumor-specific surface proteins.

Clinical Applications & Diagnostics

The most common kidney cancer, where FRET-based biomarkers have demonstrated prognostic and predictive value.

Clinical Applications & Diagnostics

A cell surface glycoprotein that binds TIGIT and CD226, overexpressed on many tumor types.

Immune Checkpoints & Immunotherapy

An activating receptor on T and NK cells that competes with inhibitory TIGIT for the same ligand (CD155).

Immune Checkpoints & Immunotherapy

Cell adhesion molecule that functions as a TIM-3 ligand, contributing to immune checkpoint signaling.

Immune Checkpoints & Immunotherapy

Light-absorbing molecular group that enables fluorescence-based detection.

Core Technology & Physics

A statistically validated threshold that divides patients into groups with distinct clinical outcomes or treatment responses.

Clinical Applications & Diagnostics

Overlap of fluorescent signals at optical resolution–indicates same region but cannot confirm molecular interaction.

Functional Biomarkers & Paradigm

Cancer of the colon or rectum, where MSI-H tumors respond well to immunotherapy but the MSS majority needs better biomarkers.

Clinical Applications & Diagnostics

Diagnostic tests determining therapy eligibility–where functional biomarkers reveal patients missed by expression.

Clinical Applications & Diagnostics

The first therapeutically targeted checkpoint–blocking early T cell suppression during immune priming.

Immune Checkpoints & Immunotherapy

Dual-function CXCR3 ligand with T cell recruitment and angiostatic activity—the most broadly validated chemokine biomarker for immunotherapy response.

Functional Biomarkers & Paradigm

Highest-affinity CXCR3 ligand with dual receptor signaling—the most potent driver of estrogen-independent growth in HR+ breast cancer.

Functional Biomarkers & Paradigm

IFN-γ-induced chemokine recruiting T cells to the TiME via CXCR3—a biomarker of inflamed tumors and immunotherapy responsiveness.

Functional Biomarkers & Paradigm

Specialized immune cells that capture, process, and present antigens to T cells, initiating adaptive immune responses.

Functional Biomarkers & Paradigm

The orientation factor describing relative alignment of donor and acceptor transition dipoles, affecting FRET efficiency.

Core Technology & Physics

A pair of fluorescent molecules where the donor emission spectrum overlaps the acceptor excitation spectrum, enabling non-radiative energy transfer.

Core Technology & Physics

A cell surface receptor whose activation drives proliferation in many cancers, particularly NSCLC.

Oncoproteins & Receptor Signaling

The energetically elevated state of a molecule after photon absorption, from which fluorescence emission occurs.

Core Technology & Physics

The characteristic decay pattern of fluorescence emission, where intensity decreases exponentially with time constant tau.

Core Technology & Physics

Standard clinical tissue preservation method compatible with FLIM-FRET analysis.

Sample Types & Laboratory Methods

Intensity-independent imaging modality measuring fluorophore lifetime for quantitative FRET detection.

Core Technology & Physics

Combined technology using fluorescence lifetime measurement to quantify FRET–the foundation of QF-Pro functional biomarker detection.

Core Technology & Physics

The average time a fluorophore remains in its excited state before returning to ground state.

Core Technology & Physics

The distance at which FRET efficiency is 50%–the physical basis for the molecular ruler.

Core Technology & Physics

A fluorescence lifetime measurement technique using sinusoidally modulated excitation light and detecting the phase shift and demodulation of emission.

Core Technology & Physics

Distance-dependent energy transfer between chromophores enabling 1–10 nm proximity detection.

Core Technology & Physics

Quantitative measure of energy transfer between donor and acceptor chromophores.

Core Technology & Physics

Biomarkers measuring molecular engagement state rather than expression–predicting outcomes where expression fails.

Functional Biomarkers & Paradigm

Beta-galactoside binding lectin that serves as a TIM-3 ligand, triggering T cell {[apoptosis]} and immune suppression.

Immune Checkpoints & Immunotherapy

The lowest energy electronic state of a molecule, from which photon absorption initiates the fluorescence process.

Core Technology & Physics

Most mitogenic receptor combination–dimerization state may expand therapy eligibility beyond HER2+ thresholds.

Oncoproteins & Receptor Signaling

Squamous cell cancers of the oral cavity, pharynx, and larynx–where immunotherapy is approved but response rates remain modest.

Clinical Applications & Diagnostics

Antibodies blocking checkpoint interactions to release anti-tumor immunity–revolutionizing cancer treatment.

Immune Checkpoints & Immunotherapy

FRET-based quantification of intercellular immune checkpoint interactions in tissue samples.

Core Technology & Physics

Receptor-ligand systems that regulate immune activation–exploited by tumors to evade T cell destruction.

Immune Checkpoints & Immunotherapy

The organized contact zone between T cells and antigen-presenting or tumor cells where signaling and checkpoint interactions occur.

Core Technology & Physics

Expression-based detection standard since 1941–one-site assay limited by subjectivity and inability to report function.

Sample Types & Laboratory Methods

The measured response of a FLIM system to an infinitely short light pulse, representing instrument timing characteristics.

Core Technology & Physics

A GTPase oncogene mutated in ~25% of all cancers, long considered undruggable until recent breakthroughs.

Oncoproteins & Receptor Signaling

Emerging checkpoint axis with recent approval–engagement measurement may improve patient selection.

Immune Checkpoints & Immunotherapy

Aggressive skin cancer where immunotherapy has transformed outcomes, but patient selection remains critical.

Clinical Applications & Diagnostics

Antigen-presenting molecules serving as checkpoint ligands–essential for LAG-3 and CD4+ T cell biology.

Immune Checkpoints & Immunotherapy

The statistical principle explaining how random molecular events produce reliable, reproducible measurements when observed in aggregate.

Core Technology & Physics

A condition of genetic hypermutability resulting from defective DNA mismatch repair–a strong predictor of ICI response.

Functional Biomarkers & Paradigm

A central kinase integrating growth signals to regulate cell growth, metabolism, and survival.

Oncoproteins & Receptor Signaling

Systemic therapy given before definitive surgery to shrink tumors and enable assessment of treatment response.

Clinical Applications & Diagnostics

Mutant peptides unique to tumor cells that can be recognized by the immune system as foreign.

Functional Biomarkers & Paradigm

The most common lung cancer type, where checkpoint inhibitors have become standard of care but biomarker-guided selection remains inadequate.

Clinical Applications & Diagnostics

Time from treatment or diagnosis until death from any cause–the definitive measure of therapeutic benefit.

Clinical Applications & Diagnostics

Activating immune checkpoint that promotes T cell expansion and anti-tumor immunity when engaged.

Immune Checkpoints & Immunotherapy

Identifying patients most likely to benefit from specific therapies–functional biomarkers improve prediction accuracy.

Clinical Applications & Diagnostics

Absence of residual invasive cancer in surgical specimen after neoadjuvant therapy–a powerful predictor of survival.

Clinical Applications & Diagnostics

The most-targeted checkpoint axis–where expression fails to predict response but interaction state succeeds.

Immune Checkpoints & Immunotherapy

A powerful visualization and analysis method that maps fluorescence decays to points on a 2D plot, enabling lifetime determination without curve fitting.

Core Technology & Physics

Major cell survival and growth pathway frequently hyperactivated in cancer, where FRET-measured activation correlates with prognosis.

Functional Biomarkers & Paradigm

Key PI3K pathway effector–activation state (pT308) predicts survival where expression fails.

Oncoproteins & Receptor Signaling

An approach tailoring treatment to individual patient characteristics, where biomarker-guided therapy selection improves outcomes.

Clinical Applications & Diagnostics

Functional Biomarkers & Paradigm

Physical contact between proteins that enables biological function.

Functional Biomarkers & Paradigm

DNA-based proximity detection at 30–40 nm–'same corridor' but cannot confirm 'same room, having a meeting.'

Functional Biomarkers & Paradigm

A tumor suppressor phosphatase that negatively regulates PI3K/Akt signaling; frequently lost in cancer.

Oncoproteins & Receptor Signaling

HAWK's patented FRET reagent kit for functional biomarker assessment, read on the Violet 3.0 FLIM system.

Core Technology & Physics

The ratio of photons emitted to photons absorbed by a fluorophore–determines brightness and affects Forster radius.

Core Technology & Physics

A minimally invasive procedure using heat to destroy tumors, which may prime anti-tumor immunity through neoantigen release.

Clinical Applications & Diagnostics

Statistical tool for assessing biomarker discriminatory ability by plotting sensitivity versus specificity at every threshold.

Clinical Applications & Diagnostics

The discipline mapping molecular information to tissue location–where proteins interact is as critical as whether they're present.

Functional Biomarkers & Paradigm

The integral of donor emission and acceptor absorption spectra overlap, directly determining the Forster radius.

Core Technology & Physics

The red-shift between fluorophore absorption and emission wavelengths, caused by energy loss during excited state relaxation.

Core Technology & Physics

A state of T cell dysfunction characterized by sustained checkpoint expression and progressive loss of effector function.

Functional Biomarkers & Paradigm

A time, measured in nanoseconds, governing fluorescence decay—each photon emission is a random quantum event, yet thousands converge on τ with extraordinary precision. FRET shortens it, encoding molecular proximity.

Core Technology & Physics

Precise time-domain detection method for fluorescence lifetime measurement in FLIM applications.

Core Technology & Physics

Checkpoint in active development–mixed trial results underscore the need for engagement-based patient selection.

Immune Checkpoints & Immunotherapy

Exhaustion marker with multiple ligands–functional measurement may clarify its role in checkpoint networks.

Immune Checkpoints & Immunotherapy

The immune and stromal cell ecosystem around tumors–where checkpoint engagement determines therapy response.

Immune Checkpoints & Immunotherapy

Fluorescence lifetime measurement using short excitation pulses and detecting the temporal decay of emission.

Core Technology & Physics

The inherent biological variation in protein expression, interactions, and cell populations across different regions of a tissue sample.

Clinical Applications & Diagnostics

A paraffin block containing small cores from many different tissue specimens, enabling high-throughput analysis.

Sample Types & Laboratory Methods

The total number of somatic mutations per megabase of tumor genome–a genomic biomarker for immunotherapy response.

Functional Biomarkers & Paradigm

A subset of T cells that suppress immune responses, often enriched in tumors where they inhibit anti-tumor immunity.

Functional Biomarkers & Paradigm

HRP-catalyzed signal enhancement (10–100×) enabling FRET detection in clinical tissue samples.

Core Technology & Physics

Assays requiring two binding events for signal generation–the foundation for detecting protein interactions.

Functional Biomarkers & Paradigm

Compact benchtop FLIM imaging system designed to read QF-Pro FRET reagent signals for functional proteomics analysis.

Core Technology & Physics

Myeloid-expressed checkpoint with unique biology–targeting distinct suppressive mechanisms from PD-1/CTLA-4.

Immune Checkpoints & Immunotherapy