# IBTR Risk Estimation — Estimating IBTR and Tx Benefit

> Estimating IBTR and Tx Benefit (iPhone/iPad app by Yasuaki Sagara.)

- Source: https://appshunter.io/ios/app/ibtr-risk-estimation/id6744888499 (this page in markdown: same URL + `.md`)
- Developer: [Yasuaki Sagara](https://appshunter.io/developer/1809752607)
- Category: Medical
- Price: $2.99
- Age rating: 17+
- Requires: iOS 16.6 · 8 MB
- Languages: American English
- Released: 2025-10-08
- Data updated: 2026-08-23
- User reviews in markdown: https://appshunter.io/ios/app/ibtr-risk-estimation/id6744888499/reviews.md

## What is IBTR Risk Estimation?

This application is a tool to estimate the risk of ipsilateral breast tumor recurrence (IBTR) after breast-conserving surgery.
It provides 10-year IBTR risk estimates and treatment effects, based on clinicopathological factors (age, pathological T stage, grade, margin status, lymphovascular invasion, hormone receptor status, HER2 status) and treatment options (radiation therapy, chemotherapy, endocrine therapy, anti-HER2 therapy). The application is available for both iPhone and iPad.

The tool was developed using a Cox proportional hazards model from a multicenter cohort of 8,938 patients and calibrated with treatment effects from the EBCTCG meta-analysis. It is designed for use in shared decision-making between patients and clinicians, as well as for educational purposes. The development methodology was presented at the 2025 ASCO Annual Meeting (Abstract No. 575) and published in JCO Clinical Cancer Informatics (Sagara et al., 2025). For further details, please refer to the publication.

Disclaimer
This application is intended for educational and informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Clinical decisions should always be made in consultation with the treating physician. The developers assume no legal responsibility for any outcomes resulting from the use of this application.


## Version history (last 3 releases)

### 1.5 — 2025-12-29

Updated the Age Rating settings.

### 1.4 — 2025-10-15

This version includes improvements to the IBTR risk estimation algorithm. Baseline risk and treatment effect visualization have been corrected for accuracy.

### 1.3 — 2025-10-08

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*