Redução tumor %
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The 'Tumor Reduction %' calculator quantifies tumor volume decrease after treatments like chemotherapy. It uses the formula (V₀−V)/V₀·100, where V₀ is the initial volume and V is the current volume. The result shows the percentage reduction, crucial for evaluating treatment response.
This tool is primarily used in oncology to monitor therapy effectiveness. Doctors compare volumes measured in images (like CT scans) before and after treatment. A reduction above 30% is typically positive, while an increase suggests treatment resistance.
Note that this calculator doesn't replace medical analysis. Results must be interpreted with high-quality imaging and by specialized professionals. Very small or irregular tumors may require complementary methods for accuracy.
Common precautions include standardizing measurements to avoid technical variations. It's recommended to use the same medical team for all exams to ensure consistency. The result is an indicator, not a final diagnosis.
Frequently asked questions
Does the formula consider tumor diameter or actual volume?
The calculator uses volume calculated from 3D measurements, typically averaged diameters from medical images.
What does 100% tumor reduction mean?
100% indicates complete tumor disappearance, which is rare. 90% is generally considered complete treatment response.
Can this calculator be used for all cancer types?
Yes, if tumors are measurable via imaging. Non-measurable tumors (like leukemia) require other assessment criteria.
How often should I check the reduction?
Frequency depends on the medical protocol, but exams are usually done every 6-8 weeks during treatment.
How does the calculator handle multiple tumors?
For multiple tumors, the average of individual volumes is calculated, and the formula is applied to the combined total volume.