Pdx Model Analysis Agent

---
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**:
```bash
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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