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Clinical calculator summary

CARG Chemotherapy Toxicity Score

A geriatric oncology model estimating grade 3-5 chemotherapy toxicity risk from clinical, treatment, laboratory, and functional factors.

Evidence-based context for fast calculator use

Purpose:
Support chemotherapy toxicity counseling and risk-mitigation planning in older adults
Population:
Adults aged 65 years or older being considered for cytotoxic chemotherapy
Factors:
Age, Regimen intensity, Laboratory values, Falls, Function, Social activity
Reference:
Hurria et al., J Clin Oncol. 2011
HomeCARG Toxicity Score (Geriatric)
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CARG Toxicity Score (Geriatric)

Clinical Context & Background

The Cancer and Aging Research Group (CARG) Toxicity Score predicts the risk of severe (Grade 3-5) chemotherapy toxicity in older adults. It outperforms Karnofsky Performance Status (KPS) in this population by incorporating geriatric assessment variables.
Primary Source EvidenceHurria A, Togawa K, Mohile SG, et al. Predicting chemotherapy toxicity in older adults with cancer: a prospective multicenter study. J Clin Oncol. 2011;29(25):3457-3465.
Formula Logic
Weighted sum of 11 clinical and geriatric assessment variables.

Reference Data

Risk GroupScoreRisk of Toxicity
Low Risk0 - 530%
Intermediate Risk6 - 952%
High Risk10 - 1983%

Clinical Workflow

Use, Interpret, And Continue The Patient Pathway

Expand for workflow guidance, limitations, examples, and related next steps.

When To Use

  • Use before cytotoxic chemotherapy in an older adult when the treatment plan and geriatric-assessment inputs are available.
  • Use only when the patient and clinical setting match the population described for CARG Chemotherapy Toxicity Score.

How To Interpret

  • A higher category indicates greater observed severe-toxicity risk and should prompt mitigation rather than automatic treatment exclusion.
  • Interpret thresholds with the entered units, current clinical status, and local guideline context.

What To Do Next

  • Review dose and regimen alternatives, supportive care, medicines, falls, nutrition, function, transport, and monitoring frequency.
  • Document the inputs, result, clinical judgment, and any reason for deviating from the model-guided pathway.

Limitations

  • The original model may not generalize to every modern targeted, immune, or combination regimen.
  • This calculator supports clinical assessment and does not independently prescribe treatment.

Validated Population

Adults aged 65 years or older being considered for cytotoxic chemotherapy

Clinical example

A high-risk result can support prehabilitation, medication review, growth-factor assessment, dose discussion, and closer follow-up while preserving patient goals.

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Frequently Asked Questions

What is CARG Chemotherapy Toxicity Score used for?

Support chemotherapy toxicity counseling and risk-mitigation planning in older adults. It is intended for adults aged 65 years or older being considered for cytotoxic chemotherapy.

Does CARG Chemotherapy Toxicity Score determine treatment by itself?

No. Confirm the population, inputs, contraindications, competing risks, and current guideline recommendations before acting on the result.

Evidence-based oncology decision support. Verify with clinical guidelines.