How do I install the Tnm Stage Calculator skill?

Run npx skillmds@latest add patolojiai/tnm-stage-calculator in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Tnm Stage Calculator safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Tnm Stage Calculator?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Tnm Stage Calculator free to use?

Yes. Installing skills from SkillMD is free. This skill is licensed under MIT.

Who published Tnm Stage Calculator?

patolojiAI (@patolojiai) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Tnm Stage Calculator by patolojiai — Agent Skill

Name: Tnm Stage Calculator
Author: patolojiAI

Tnm Stage Calculator

Fast TNM stage group calculation from pT, pN, pM categories using AJCC 8th edition criteria, with automatic consistency validation. Use when the user asks "what stage is pT2 N1 M0", "calculate TNM stage", "stage group for pT3 N1b breast", "is pT2 N0 M0 stage I or II", "stage this pancreatic cancer", or any pT/pN/pM to stage-group conversion. Supports breast, colorectal, pancreas, and gastric carcinoma. Flags inconsistencies like tumor-size-vs-pT mismatches and node-count-vs-pN mismatches.

patolojiAI Updated Sep 17, 2026

File contents

TNM Stage Calculator

Quick and accurate TNM stage group calculation based on AJCC 8th edition staging manual.

When to Use This Skill

Use this skill for:

Quick stage group lookup from pT/pN/pM
Teaching TNM staging to residents
Verifying report staging accuracy
Calculating stage from pathologic findings
Tumor board preparation

Supported Tumor Types

Breast invasive carcinoma (AJCC 8th pathologic stage groups)
Colorectal carcinoma (AJCC 8th pathologic stage groups)
Exocrine pancreas carcinoma (AJCC 8th pathologic stage groups)
Gastric carcinoma (AJCC 8th pathologic stage groups)

Key Features

Stage Group Calculation: Input pT/pN/pM → Output stage group (0, I, IIA, IIB, IIIA, etc.)
Validation: Checks if pT/pN/pM combination is valid
Prognostic Info: Provides stage group meaning
Fast Lookup: Lightweight skill optimized for speed

Reference Files

Reference on-demand (DO NOT load at startup):

Staging tables: ../../shared-references/staging/tnm_stage_calculator.md

Usage Examples

# Calculate stage
claude "What stage is pT2 N1 M0 for breast using tnm-stage-calculator"

# Quick lookup
claude "Stage pT3 N1b M0 colorectal using tnm-stage-calculator"

# Verify staging
claude "Is pT1c N0 M0 stage IA for breast using tnm-stage-calculator"

Processing Instructions

Parse input: Extract pT, pN, pM categories and tumor type
Load staging table for specific tumor type
Look up stage group from pT/pN/pM combination
Validate: Check if combination exists in AJCC 8th
Output: Stage group with brief prognostic interpretation

Important Notes

Uses pathologic stage groups (pTNM), not clinical stage groups (cTNM)
Based on AJCC 8th edition (2017)
For breast, does not include anatomic stage groups (uses prognostic stage groups where applicable)
For colorectal, includes post-neoadjuvant treatment modifications (ypTNM)

Input Format Examples

"pT2 N1a M0 for breast"
"What is the stage for pT3 N1b M0 colorectal?"
"Calculate stage: pT2 N1 M0 pancreas"
"Stage group for gastric pT3 N2 M0"

Note: Lightweight skill. Staging table loaded on-demand during processing only.

---name: tnm-stage-calculatordescription: Fast TNM stage group calculation from pT, pN, pM categories using AJCC 8th edition criteria, with automatic consistency validation. Use when the user asks "what stage is pT2 N1 M0", "calculate TNM stage", "stage group for pT3 N1b breast", "is pT2 N0 M0 stage I or II", "stage this pancreatic cancer", or any pT/pN/pM to stage-group conversion. Supports breast, colorectal, pancreas, and gastric carcinoma. Flags inconsistencies like tumor-size-vs-pT mismatches and node-count-vs-pN mismatches.license: MIT---# TNM Stage CalculatorQuick and accurate TNM stage group calculation based on AJCC 8th edition staging manual.## When to Use This SkillUse this skill for:- Quick stage group lookup from pT/pN/pM- Teaching TNM staging to residents- Verifying report staging accuracy- Calculating stage from pathologic findings- Tumor board preparation## Supported Tumor Types- Breast invasive carcinoma (AJCC 8th pathologic stage groups)- Colorectal carcinoma (AJCC 8th pathologic stage groups)- Exocrine pancreas carcinoma (AJCC 8th pathologic stage groups)- Gastric carcinoma (AJCC 8th pathologic stage groups)## Key Features1. **Stage Group Calculation**: Input pT/pN/pM → Output stage group (0, I, IIA, IIB, IIIA, etc.)2. **Validation**: Checks if pT/pN/pM combination is valid3. **Prognostic Info**: Provides stage group meaning4. **Fast Lookup**: Lightweight skill optimized for speed## Reference FilesReference on-demand (DO NOT load at startup):- Staging tables: `../../shared-references/staging/tnm_stage_calculator.md`## Usage Examples```bash# Calculate stageclaude "What stage is pT2 N1 M0 for breast using tnm-stage-calculator"# Quick lookupclaude "Stage pT3 N1b M0 colorectal using tnm-stage-calculator"# Verify stagingclaude "Is pT1c N0 M0 stage IA for breast using tnm-stage-calculator"```## Processing Instructions1. **Parse input**: Extract pT, pN, pM categories and tumor type2. **Load staging table** for specific tumor type3. **Look up stage group** from pT/pN/pM combination4. **Validate**: Check if combination exists in AJCC 8th5. **Output**: Stage group with brief prognostic interpretation## Important Notes- Uses **pathologic stage groups** (pTNM), not clinical stage groups (cTNM)- Based on **AJCC 8th edition** (2017)- For breast, does not include anatomic stage groups (uses prognostic stage groups where applicable)- For colorectal, includes post-neoadjuvant treatment modifications (ypTNM)## Input Format Examples- "pT2 N1a M0 for breast"- "What is the stage for pT3 N1b M0 colorectal?"- "Calculate stage: pT2 N1 M0 pancreas"- "Stage group for gastric pT3 N2 M0"---**Note**: Lightweight skill. Staging table loaded on-demand during processing only.

Frequently asked questions