OpenCancer

ai.opencancerPublished by opencancer.aiOfficial publisherv2.0.0Updated Oct 28, 2026

Cancer patient expert: NCCN-grounded answers with sources, recruiting trials, and expert review.

VerifiedStreamable HTTPWeb executableLocation & LifestyleWeb Search & ScrapingKnowledge & Memory

Overview

AI-generated overview

OpenCancer answers cancer patient and caregiver questions in plain language, grounded in NCCN patient guidelines, and finds recruiting clinical trials.

What you can do
  • Ask plain-language questions about a diagnosis, stage, biomarker, test result, treatment options, side effects or questions for the oncologist, with sources
  • Find clinical trials recruiting now by cancer type, location, biomarker, drug or phase, with NCT number, sponsor and nearby sites
  • Look up one trial by NCT number, including inclusion and exclusion criteria in original wording, sites and study contacts
  • Get a link to start an expert case review by OpenCancer and Cancer Commons scientists
  • Flag an answer for human expert review or send feedback to the OpenCancer team
When to use it
Useful when a patient or caregiver wants understandable explanations of cancer information with guideline-based sources, or wants to shortlist recruiting trials and prepare for a conversation with their oncologist. It is informational support, not a substitute for medical advice.
Requirements
A remote MCP endpoint at opencancer.ai over streamable HTTP; no packages, environment variables or headers are declared. An internet connection is needed, and the case-review link leads to a separate intake page the patient fills in themselves.
Before you install
Answers are informational and eligibility for trials is confirmed only by the trial team, so decisions should go through a clinician. The case-review tool only returns an intake link; the patient enters their own details and records there. Feedback and flagged answers are sent to the OpenCancer team, so avoid sharing identifying health details in messages.

Installation

In SourceWeft

  1. Open OpenCancer in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/ai.opencancer%2Fopencancer/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "opencancer": {
      "type": "http",
      "url": "https://opencancer.ai/api/mcp"
    }
  }
}

Tools

5

ask_opencancer

Ask OpenCancer

Answers a cancer patient or caregiver question in plain language, grounded in NCCN Guidelines for Patients and medical literature. Covers what a diagnosis, stage, biomarker or test result means; treatment options; side effects and their management; questions for the oncologist; second opinions; living with cancer. Answers in the language of the question. Returns the answer, its sources, a disclaimer, a link to OpenCancer's care team, and an answer id. Emergencies, prognosis or life-expectancy questions, and questions about children return a safety message that routes to the care team instead of an answer. Educational information, not medical advice. Accepts no personal identifiers

Parameterscontextquestionrequiredcancer_type

find_clinical_trials

Find recruiting clinical trials

Lists clinical trials recruiting now for a cancer type, from ClinicalTrials.gov, optionally near a city, state or country and filtered by a biomarker, drug or treatment keyword and by phase. Returns up to 8 trials with NCT number, phase, sponsor, the sites closest to the requested place, a registry link, a link to the full search, and a link to an OpenCancer expert who can build a trial shortlist for a specific case. Listing a trial is not an eligibility decision; only the trial team can confirm eligibility

Parametersphasekeywordlocationconditionrequired

get_trial_details

Get clinical trial details

Returns one clinical trial from ClinicalTrials.gov by its NCT number: what it tests, phase, status, last registry update, ages, the inclusion and exclusion criteria in their original wording, recruiting sites with their status, study contacts, and the registry link. Eligibility is confirmed only by the study team

Parametersnct_idrequired

open_case

Get the expert review link

Returns a link where a patient can start an expert review of their case by OpenCancer and Cancer Commons scientists (records, options, trial shortlist, next step). The link only opens an intake page: no case is created and no records are sent. The patient enters their own details and personally confirms consent on that page. Accepts no names, contact details or records.

Parametersquestioncancer_typepreferred_destinations

send_feedback

Flag an answer or send feedback

Flags an OpenCancer answer for human expert review, or sends feedback to the OpenCancer team. Used when the user says an OpenCancer answer was wrong, unsafe, or incomplete, or wants to tell OpenCancer something (answer_id identifies the answer; message holds the user's words). Also used to report that an OpenCancer tool returned no usable answer (kind "missing_answer" with answer_id or tool, no message). Feedback is read by the OpenCancer team; it is not an urgent-care channel and no reply is sent through it.

Parameterskindrequiredtoolmessageanswer_id

Version history

1
  1. v2.0.0LatestOct 15, 2026

Score

83% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.