Bio Workflows Biomarker Pipeline

Biomarker Discovery Pipeline

Complete pipeline from expression data to validated biomarker panels with classifier.

Workflow Overview

Expression matrix + Metadata
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[1. Data Preparation] -----> StandardScaler, train/test split
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[2. Feature Selection] ----> Boruta or LASSO stability selection
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[3. Model Training] -------> RandomForest/XGBoost with nested CV
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[4. Model Interpretation] -> SHAP values, feature importance
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[5. Validation] -----------> Hold-out test, bootstrap CI
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Validated biomarker panel + classifier

Step 1: Data Preparation

import pandas as pd
from sklearn.model_selection import train_test_split
from sklearn.preprocessing import StandardScaler

expr = pd.read_csv('expression.csv', index_col=0)
meta = pd.read_csv('metadata.csv', index_col=0)

X = expr.T  # samples x genes
y = meta.loc[X.index, 'condition'].values

# test_size=0.2: Standard 80/20 split; use 0.3 for <100 samples
X_train, X_test, y_train, y_test = train_test_split(
    X, y, test_size=0.2, stratify=y, random_state=42
)

# Fit scaler on training only to prevent data leakage
scaler = StandardScaler()
X_train_scaled = scaler.fit_transform(X_train)
X_test_scaled = scaler.transform(X_test)