Module 12: Integrative Multi-Omics Case Studies: WHO CNS5 Glioma Subtyping & Therapy Monitoring

1. The Multimodal Molecular Tumor Board Case

A 48-year-old male presents with new-onset generalized seizures. Brain MRI reveals an ill-defined, non-enhancing infiltrating lesion in the left frontal lobe. Stereotactic biopsy is performed, with tissue and lumbar puncture cerebrospinal fluid (CSF) collected under clinical biobanking protocols.

2. Longitudinal Therapy Response & Recurrence Monitoring

Following surgical resection and adjuvant radiation, the patient undergoes routine 3-month follow-up imaging. At 9 months, MRI reveals a new T2/FLAIR hyperintense signal in the surgical margin, raising suspicion of tumor recurrence versus post-radiation treatment-related necrosis (pseudoprogression):

# Clinical Diagnostic Decision Logic in Python
def evaluate_glioma_response(mri_flair_change, csf_2hg_level, prM_hk2_ratio):
    print("--- Molecular Tumor Board Clinical Assessment ---")
    if csf_2hg_level < 2.0 and prM_hk2_ratio < 1.2:
        diagnosis = "Treatment-Related Radiation Pseudoprogression (Non-Malignant)"
        recommendation = "Maintain clinical observation; avoid invasive repeat craniotomy."
    elif csf_2hg_level >= 5.0 and prM_hk2_ratio >= 2.0:
        diagnosis = "True Malignant Tumor Recurrence / Malignant Progression"
        recommendation = "Initiate targeted IDH1 inhibitor therapy (Vorasidenib/Ivosidenib) or clinical trial enrollment."
    else:
        diagnosis = "Equivocal / Indeterminate Biochemical Status"
        recommendation = "Repeat lumbar puncture in 4 weeks; perform advanced perfusion MRI."
    
    return {"Diagnosis": diagnosis, "Management": recommendation}

# Patient Case 9-Month Follow-Up Data:
patient_eval = evaluate_glioma_response(
    mri_flair_change="+25% volume expansion",
    csf_2hg_level=1.1, # Normalizes back to baseline!
    prM_hk2_ratio=0.95 # No glycolytic hyperactivation!
)

print(f"Final Diagnosis: {patient_eval['Diagnosis']}")
print(f"Actionable Plan: {patient_eval['Management']}")

The patient's CSF $2\text{-HG}$ and proteomic glycolytic markers remained basal ($1.1\ \mu\text{mol/L}$), definitively proving radiation-induced pseudoprogression. Unnecessary repeat surgery was safely averted, and subsequent imaging confirmed spontaneous radiological stabilization.