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name: 'pdx-model-analysis-agent' description: 'AI-powered analysis of patient-derived xenograft (PDX) models for drug response prediction, translational research, and personalized treatment selection.' measurable_outcome: Execute skill workflow successfully with valid output within 15 minutes. allowed-tools:

• read_file
• run_shell_command

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PDX Model Analysis Agent

The PDX Model Analysis Agent provides AI-driven analysis of patient-derived xenograft models for preclinical drug testing, translational research, and personalized oncology. It correlates PDX drug responses with patient outcomes and molecular profiles for treatment selection.

When to Use This Skill

• When selecting drug treatments based on PDX drug response data.
• To correlate PDX molecular profiles with patient tumor characteristics.
• For analyzing PDX-patient concordance in drug sensitivity.
• When designing preclinical drug combination studies.
• To identify biomarkers predicting PDX and patient drug response.

Core Capabilities

1. PDX-Patient Concordance: Analyze molecular similarity between PDX and donor tumor.

2. Drug Response Modeling: ML models correlating PDX drug sensitivity to patient outcomes.

3. Biomarker Discovery: Identify molecular features predicting drug response in PDX panels.

4. Combination Screening: Analyze synergy in PDX drug combination studies.

5. Translational Prediction: Project PDX findings to patient treatment selection.

6. Quality Assessment: Evaluate PDX fidelity and stability across passages.

PDX Quality Metrics

Metric	Threshold	Interpretation
Genetic concordance	>90%	Variants maintained
Expression correlation	>0.85	Transcriptome preserved
CNV fidelity	>85%	Copy number stable
Tumor take rate	Variable	Engraftment success
Passage stability	<P5 recommended	Minimal drift

Workflow

1. Input: PDX molecular data, drug response curves, patient tumor data.

2. Concordance Analysis: Compare PDX to donor tumor at molecular level.

3. Drug Response Processing: Calculate IC50, AUC, TGI from growth curves.

4. Biomarker Analysis: Correlate molecular features with drug sensitivity.

5. Patient Prediction: Project findings to patient treatment recommendations.

6. Quality Assessment: Flag PDX models with significant drift.

7. Output: Drug rankings, biomarker associations, treatment recommendations.

Example Usage

User: "Analyze PDX drug response data for this breast cancer patient and recommend treatments."

Agent Action:

python3 Skills/Oncology/PDX_Model_Analysis_Agent/pdx_analyzer.py \
    --pdx_rnaseq pdx_expression.tsv \
    --pdx_mutations pdx_variants.maf \
    --patient_tumor patient_expression.tsv \
    --drug_responses pdx_drug_panel.csv \
    --tumor_type breast_cancer \
    --concordance_check true \
    --output pdx_recommendations/

Drug Response Metrics

Metric	Calculation	Interpretation
IC50	Concentration for 50% inhibition	Potency
AUC	Area under dose-response curve	Overall sensitivity
TGI	Tumor growth inhibition %	In vivo efficacy
T/C	Treated/Control volume ratio	Treatment effect
Best response	Maximum tumor regression	Depth of response

PDX Resource Integration

Resource	Coverage	Data Types
PDXFINDER	4000+ models	Multi-omic, drug response
PDMR (NCI)	500+ models	Genomic, drug response
Champions/Crown	1500+ models	Drug response
EurOPDX	1000+ models	European cohort

AI/ML Models

Drug Response Prediction:

• Gradient boosting on multi-omic features
• Gene expression signatures for drug classes
• Mutation-based response predictors

PDX-Patient Translation:

• Transfer learning from PDX to patient
• Domain adaptation for species differences
• Concordance-weighted predictions

Combination Synergy:

• Bliss independence model
• Loewe additivity analysis
• Machine learning synergy prediction

Clinical Translation Considerations

Factors Affecting Translation:

1. Tumor heterogeneity: PDX from single biopsy
2. Microenvironment: Mouse vs human stroma
3. Immune system: Immunodeficient hosts
4. Pharmacokinetics: Species differences
5. Passage number: Drift over time

Best Practices:

• Use early passage PDX (P1-P5)
• Confirm molecular concordance
• Test drug at clinically-relevant doses
• Consider humanized PDX for immunotherapy

Prerequisites

• Python 3.10+
• scikit-learn, pandas
• Drug response databases
• PDX molecular datasets

Related Skills

• Drug_Repurposing - For alternative drug identification
• Multi_Omics_Integration - For PDX characterization
• Clinical_Trials - For trial matching

Output Report

1. Concordance Summary: PDX-patient molecular similarity
2. Drug Rankings: Predicted efficacy from PDX data
3. Biomarker Associations: Features driving sensitivity
4. Quality Flags: PDX reliability assessment
5. Treatment Recommendations: Prioritized drug list

Author

AI Group - Biomedical AI Platform

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