oBDS2FHIR / ADT2FHIR

oBDS2FHIR (also called ADT2FHIR) is a tool to transform files exported by German tumor documentation systems into FHIR bundles for use in the Bridgehead (or other FHIR-based software).

Using the two XSLT files (oBDS2MDS.xsl and MDS2FHIR.xsl), XML files conforming to oBDS or the legacy version ADT/GEKID V2* can be transformed into FHIR resources conforming to de.dktk.oncology.

This software was originally created for the German Cancer Consortium's Clinical Communication Platform and has since been made open source.

Two names, one software

ADT2FHIR was originally developed in 2020 to integrate the ADT/GEKID dataset, which was hence renamed to Onkologischer Basisdatensatz (oBDS). Thus, ADT2FHIR is now also known as oBDS2FHIR (terms are used synonymously).

Usage

The main method transforms oBDS compliant data into FHIR bundles. Therefore, put your oBDS data in the input directory /clincial_data/Input_Patients. Optionally, you can (1) pseudonymize (e.g. see Mainzelliste) and (2) import the data into a FHIR server (e.g. see Blaze).

Docker

oBDS2FHIR is designed for use with docker compose. To run, put the oBDS xml files in /clinical_data/Input_oBDS/ and run:

docker-compose up

You need at least docker-compose version 1.29.2. The configuration is set in the docker-compose.yml file and is preconfigured as far as possible (you probably won't need to set #commented parameters):

Environment:

Set the environment variables either directly in Java oder via docker compose (start with the default values from the Dockerfile):

• FILE_PATH defines the directory of the clinical oBDS data in the docker container. There souldn't be a reason to change this for docker.

• STORE_PATH defines the URL of the FHIR server API. You can use the default value, when using the default BLAZE server (https://github.com/samply/blaze).

• STORE_AUTH sets the FHIR server authentication. Leave it empty if there is no authentication.

• IDENTIFIER_SYSTEM defines the system of the FHIR identifiers. You can use the default value or set your own system URL.

• MAINZELLISTE_URL for pseudonymization in the transformation step; sets the URL of the pseudonymization service. Leave it empty if there is no pseudonymization.

• MAINZELLISTE_APIKEY sets the pseudonymization service authentication. Leave it empty if there is no pseudonymization.

• IDTYPE sets the pseudonym type. Leave it empty if there is no pseudonymization.

• SALT defines a random additional input for the hashing applied in generating the FHIR ids from oBDS. Please do change this

• SSL_CERTIFICATE_VALIDATION can be set to false IF your FHIR server is only accessible via https and you do NOT have a valid SSL certificate. Not recommended!

• ADD_DEPARTMENTS can be set to true if you want to add the departments that commited the patient report (=oBDS Melder). Probably not necessary.

Volumes:

• ./clinical_data:/obds2fhir/clinical_data You can use the default value, which then mounts the host clinical_data directory to the docker container.

• /etc/bridgehead/traefik-tls:/.../:ro If you use https, please set the correct certificate path here (should work out of the box for use with Bridgeheads).

Network - extra_hosts:

• "host.docker.internal:host-gateway" If you run oBDS2FHIR in an additional docker-compose file on the same host and don't manage the docker network yourself, then use this configuration to enable access to other services (FHIR server; pseudonymization service).

Notes

Assumes: Patient, Sample, Diagnose always have an Id, other Ids are optional.

-_Lokal_DKTK_ID_Pat_System_ needs to conform to https://www.hl7.org/fhir/datatypes.html#uri

You should modify the identifier system (replace http://dktk.dkfz.de/fhir/onco/core/CodeSystem/PseudonymArtCS with a local URL). You can just make one up (or use the default), but note that this URL will be used as Identifier.system in the resulting FHIR Patient resources (Identifer.value will either be (a) a hash based on patient master data or, if pseudonymization is configured, (b) be replaced by a Mainzelliste-generated pseudonym).

Since ids are required in FHIR but optional in the oBDS XML schema, they are generated via content hashing if not present. However, it is recommended to provide all optional ids in the imported oBDS XML files. Additionally, Patient_ID, Diagnosis_ID and Sample_ID are required.