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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
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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%

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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.