Privacy Policy – TNM Cancer Staging App
Last Updated: November 14, 2025
Effective Date: November 13, 2025
Your privacy is our priority. Learn how we protect your data while delivering accurate cancer staging information.
Section 1
Introduction
Thank you for using the TNM Cancer Staging App ("the App"), a mobile application designed to provide healthcare professionals, researchers, and students with accurate, up-to-date cancer staging information based on the globally recognized TNM (Tumor, Node, Metastasis) classification system. The App is developed and operated by Dr. Rishabh Kumar ("I," "me," or "mine"), an educational initiative committed to advancing public access to cancer staging knowledge.
This Privacy Policy explains how we collect, use, disclose, store, and protect your information when you use our App, available on Google Play Store and Apple App Store. We are fully compliant with:
  • Google Play Store Privacy Requirements (Google Play Families Policy, Data Safety Section)
  • Apple App Store Review Guidelines (App Store Review Guideline 5.1 – Data Collection and Storage)
  • General Data Protection Regulation (GDPR) – EU/EEA users
  • California Consumer Privacy Act (CCPA/CPRA) – California residents
  • Health Insurance Portability and Accountability Act (HIPAA) – Note: This App does not collect or process Protected Health Information (PHI)
By installing or using the App, you agree to the practices described in this Privacy Policy. If you do not agree, please do not use the App.
Section 2
Scope of This Policy
This Privacy Policy applies to:
  • The TNM Cancer Staging App on Android and iOS
  • Any associated services, including push notifications via Firebase Cloud Messaging (FCM)
  • Our backend infrastructure hosted on Google Firebase
It does not apply to:
  • Third-party websites or services linked within the App (e.g., AJCC, UICC, PubMed)
  • Any future web dashboard (admin panel) – separate policy will apply
Section 3
Information We Collect
We collect minimal personal data to ensure the App functions effectively and securely. All data collection is transparent, purpose-limited, and user-controlled.
3.1 Data You Provide Directly
We collect the following when you use the App:

Note: You can use the App 100% anonymously without signing in. No account = no personal data stored.
3.2 Data Collected Automatically
3.3 Push Notification Data
No location data, contacts, camera, microphone, or health data is collected.
Section 4
How We Use Your Information
We use collected data only for the following purposes:
Section 5
AI-Powered Data Updates
Transparency Statement
The App's cancer staging database is entirely derived from publicly available, peer-reviewed medical literature, including:
  • AJCC Cancer Staging Manual (8th Edition, 2025)
  • UICC TNM Classification of Malignant Tumours
  • NCCN Guidelines
  • PubMed Open Access Articles
  • Cancer.org, FACS.org, UICC.org
We use AI models (Claude by Anthropic) with web search capabilities to:
  1. Detect new editions (e.g., AJCC 9th vs 8th)
  1. Identify changed definitions (e.g., new T1a criteria for lung cancer)
  1. Extract only modified data for admin review

Important Privacy Notes:
  • No user data is used in AI training
  • AI processes only public web content
  • All AI-suggested updates are manually reviewed before deployment
  • Update logs are stored in updates collection (publicly auditable)
Section 6
Data Sharing and Third Parties
We do not sell, rent, or trade your personal information.
We share data only with trusted partners under strict contracts:
All partners are GDPR-compliant and SOC 2 certified.
Section 7
Data Storage and Security
Encryption
Data in transit (TLS 1.3), at rest (AES-256)
Firestore Security Rules
Deny write access to unauthorized users
Service Account Isolation
Backend-only access; no client-side keys
Regular Audits
Quarterly security reviews
Data Minimization
Delete inactive anonymous data after 90 days
We follow NIST Cybersecurity Framework and OWASP Mobile Top 10 best practices.
Section 8
Your Privacy Rights
You have full control over your data.
We respond within 30 days (CCPA: 45 days).
Section 9
Children's Privacy
COPPA Compliance
The App is not directed to children under 13 (or 16 in EEA).
  • We do not knowingly collect data from children
  • No account creation allowed for minors
  • Parental consent required if discovered
If we learn a user is under age, we delete their data immediately.
Section 10
Push Notifications
You may receive push notifications about:
  • New staging editions (e.g., AJCC 9th)
  • Critical updates for favorited sites
  • App improvements
Control:
  • Disable in device settings (iOS: Settings → Notifications; Android: App Info)
  • Or in-app: Settings → Notifications

FCM Topic: All users subscribed to all_users topic. Unsubscribe by disabling notifications.
Section 11
Data Retention
Account Data
Until deletion request
Analytics
14 months (Google policy)
Crash Logs
90 days
FCM Tokens
Until app uninstall or token refresh
IP Logs
30 days
Favorites
Until account deletion
Anonymous usage data is anonymized within 90 days.
Section 12
International Data Transfers
Your data may be processed in the United States or other countries where our servers or partners operate.
We ensure adequate safeguards:
Standard Contractual Clauses (SCCs)
EU-US Data Privacy Framework (DPF) compliance
Binding Corporate Rules (BCRs) with partners
Section 13
Changes to This Policy
We may update this Privacy Policy to reflect:
  • New features
  • Legal requirements
  • AI or data practice changes
Notification:
  • In-app banner
  • Email (if signed in)
  • Updated "Last Updated" date
Continued use after changes constitutes acceptance.
Section 14
Contact Us
For privacy questions, requests, or complaints:
We respond within 48 hours.
Section 15
App Store Compliance Summary
Section 16
Our Commitment

We are not a healthcare provider. This App is for educational and reference purposes only. It does not diagnose, treat, or replace professional medical advice.
The database is built entirely from public literature and updated with AI-assisted human review. We strive for accuracy but cannot guarantee 100% error-free data.
By using the TNM Cancer Staging App, you acknowledge that you have read, understood, and agree to be bound by its terms.
© 2025 [email protected]. All rights reserved.