Saved Results

No results saved yet.

Enter a patient name and hit Save on a result.

Clinical calculator summary

CARG-BC Breast Chemotherapy Toxicity Calculator

An 8-item score estimating severe chemotherapy toxicity in older adults with early-stage breast cancer.

Evidence-based context for fast calculator use

Purpose:
Support neoadjuvant/adjuvant chemotherapy toxicity discussion
Population:
Adults age 65 or older with stage I-III breast cancer receiving chemotherapy
Factors:
Stage, Anthracycline use, Treatment duration, Hemoglobin, Liver function, Falls, Walking limitation, Social support
Reference:
Magnuson et al., J Clin Oncol 2021
HomeCARG-BC Breast Chemotherapy Toxicity
Pin your most used calculators here by clicking the star in the dropdown.

CARG-BC Breast Chemotherapy Toxicity

Clinical Context & Background

CARG-BC is an 8-item breast cancer-specific chemotherapy toxicity risk tool developed for adults age 65 or older with stage I-III breast cancer receiving neoadjuvant or adjuvant chemotherapy. It estimates grade 3-5 chemotherapy-related toxicity risk and was designed to outperform the general CARG tool in this population.
Use CARG-BC as a shared decision-making aid alongside cancer recurrence risk, regimen benefit, geriatric assessment, organ function, patient goals, and oncology/pharmacy review.
Formula Logic
Sum weighted points from stage, anthracycline use, treatment duration, hemoglobin, liver function, falls, walking limitation, and crisis-support availability.

Reference Data

CARG-BC ScoreRisk CategoryGrade 3-5 Toxicity Risk
0 - 5Low27%
6 - 11Intermediate45%
12 or moreHigh76%

Clinical Workflow

Use, Interpret, And Continue The Patient Pathway

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

When To Use

  • Use CARG-BC Breast Chemotherapy Toxicity when breast-specific CARG-BC score for grade 3-5 chemotherapy toxicity risk in older adults with early-stage breast cancer.
  • Confirm that the patient, diagnosis, disease phase, and available inputs match the cited model before calculation.

How To Interpret

  • Interpret the displayed result using the calculator-specific formula and reference table, spanning 0 - 5 through 12 or more.
  • A boundary result should prompt input verification and clinical review rather than false precision.

What To Do Next

  • Review function, cognition, nutrition, comorbidity, medicines, falls, social support, treatment goals, and modifiable risks.
  • Document the inputs, result, timing, and clinical context so the assessment can be reproduced.

Limitations

  • Geriatric tools support individualized mitigation and do not define frailty or treatment eligibility alone.
  • The result supports clinician judgment and does not independently determine treatment.

Validated Population

older adults with cancer being assessed for vulnerability or treatment toxicity

How to apply this result

For a representative case, verify Breast cancer stage, Planned anthracycline use?, Planned treatment duration, calculate the result, and confirm that its classification matches the highlighted reference band before continuing the disease-specific pathway.

Geriatric Oncology hubContinue to related calculators and clinical workflow resources.

Share This Calculator

Share:

Related Tools

CRASH Chemotherapy Toxicity Score

Frequently Asked Questions

When should CARG-BC be used instead of the general CARG score?

CARG-BC was developed specifically for older adults with stage I-III breast cancer receiving neoadjuvant or adjuvant chemotherapy, so it is preferred for that population when the required inputs are available.

Does CARG-BC decide whether chemotherapy should be omitted?

No. It estimates toxicity risk. Treatment decisions should weigh recurrence benefit, regimen alternatives, patient priorities, geriatric vulnerabilities, and oncology judgment.

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