Lhasa Limited shared knowledge shared progress


A tool where scientifically supported risk assessment decisions can be made using adverse outcome pathways.

Kaptis logo 226pxw
  • Kaptis is a strategic project with the aim of developing a novel software solution, where users can develop, store, explore and share Adverse Outcome Pathway (AOP) knowledge.

  • Kaptis will employ a network of AOPs to organise evidence and combine it in a meaningful way to support risk assessments, through an integrated approach to testing and assessment (IATA).

  • The integration of assays with relevant Key Events (KEs) will help to inform decisions on which assays to run. In addition to this, associating assay data to KEs will provide the ability to perform similarity searches on compounds of interest.


Kaptis will allow users to explore toxicological hazards, using a combination of existing knowledge and assay data in the context of AOPs.

An AOP is a formalised approach to documenting a mechanism of toxicity. AOPs start with a molecular initiating event (MIE) and through additional key events (KEs), lead to an Adverse Outcome (AO). Each sequential KE (including the MIE and AO) are connected to each other through key event relationships (KERs). Formally, each KE should be measurable and therefore can be linked to a relevant assay.

Aims of the project:

The aim of the project is to provide a sustainable AOP framework to support assessment of risk of human adverse events caused by exposure to chemicals. Kaptis will achieve this aim through bringing together AOPs, assays and assay data to help improve decision-making through allowing questions such as:

  1. Given this chemical, what do compounds like mine do?
  2. Given this chemical and/or this assay result (irrespective of the chemical), what AO should I worry about?
  3. Given this AO, what assay should I run?

These questions will be addressed within Kaptis using a weight of evidence approach to give an overall outcome as well as statistical relationships.

History of the project:

AOPs are increasingly being developed to rationalise mechanisms of toxicity. An understanding of AOPs and relevant assays available to measure KEs is increasingly important, with the current drive towards new approach methodologies (NAMs) for toxicity assessments – such as in vitro assays.

Lhasa has developed a prototype version of Kaptis which can be used to explore toxicological hazards using a combination of existing knowledge and assay data in the context of AOPs.

The intention of the proposed Kaptis collaborative consortium over the course of the strategic project, is to develop a sustainable AOP framework to support assessment of risk of human adverse events caused by exposure to chemicals within Kaptis.


Figure 1. A graphical representation of an AOP displayed in Kaptis. 



Why do you need Kaptis?

  • Kaptis will be an essential tool for teams working within the drug development process who are looking to use AOPs, and relevant assay data, to rationalise mechanisms of toxicity using a weight of evidence approach.

  • As well as visualising individual AOPs, Kaptis allows users to search for a specific key event and view any pathways leading to and from the key event alongside any associated assays.

  • In addition to hosting Lhasa‘s curated AOPs for carcinogenicity and developmental and reproductive toxicity (DART), Kaptis will allow for the development of custom AOPs. Custom AOPs will include the permitted addition of relevant assays and assay data. Using the software to develop AOPs allows for the reuse of KEs already within the database and development pathway networks.

  • By incorporating assay data, linking to various key events within an AOP, Kaptis will help users to make informed decisions on potential candidates through increased understanding of mechanistic profiles.

  • Work is currently being undertaken at Lhasa to determine how reasoning between assay data types associated with AOPs (e.g. in vitro, in vivo and in silico) can be used within a regulatory framework. In the future, Kaptis may assist you with meeting specific regulations such as ICH S12 as well as broader areas of regulatory toxicological assessments using AOP analysis.

Back to top


Figure 2. A graphical representation of searching for a key event within Kaptis and viewing all AOPs in relation to the searched key event.





General Approach 

Kaptis is currently populated with AOPs generated and curated by Lhasa scientists. Two key streams of AOP development have been implemented within Kaptis:

  1. Carcinogenicity – genotoxic and non-genotoxic mechanisms
  2. Developmental and reproductive toxicity (DART)

The Lhasa science team are taking a literature-based approach to AOP development. By using information within Derek NexusLhasa’s expert toxicity prediction software, putative AOPs have been developed and then improved through literature research.1

Where there are shared KERs between different AOPs, the KEs are linked into AOP networks.

Back to top

Get Involved

An ICH S1 consortium of industry experts is being built to advance future development of Kaptis.This consortium consists of several industry partners – all with a common goal of supporting meeting ICH S1 and reducing animal testing using Adverse Outcome Pathways (AOPs) within Kaptis.

To join this conversation, please send us a message.

Wiki Kaptis

Wiki Kaptis is a free tool, resulting from an ongoing collaboration between Lhasa Limited and AOP-Wiki.

The freely available Wiki Kaptis application displays AOPs from only the AOP-Wiki source. A shared aim of this ongoing collaboration and Wiki Kaptis is, to improve AOP-Wiki knowledge visualisation and interrogation. This has been achieved through Wiki Kaptis functionality that displays an AOP network from a AOP-Wiki KE of interest, within Wiki Kaptis, allowing Wiki Kaptis users to easily understand the collateral impact of a KE, outside of a single AOP. A secondary objective, as a result of the creation of an AOP networks is to reveal new emergent pathways. Such new pathways have been realised, from existing AOP-Wiki knowledge as a result of the AOP network creation, where a KE is present in more than one AOP, unknown relationships can be discovered. If you are interested in viewing this AOP network, access Wiki Kaptis for free



Wiki Kaptis Logo

Why Choose Lhasa?

Lhasa Limited - an honest broker and trusted holder of data

Lhasa is a not-for-profit organisation and believes that shared knowledge can lead to shared progress. Recognised as the original "Honest Broker", Lhasa Limited has repeatedly been trusted with proprietary data and this can be seen with our involvement in other collaborative data sharing projects (such as Effiris).


  1. Myden, A. (2019) ‘Using an Adverse Outcome Pathway framework to ground approaches in predictive toxicology’ [PowerPoint presentation]. Available at: https://www.lhasalimited.org/library/ (Accessed: 02 Feb 2020).
  2. ICH Safety Guidelines [online] https://www.ich.org/page/safety-guidelines (Accessed: 17 Feb 2020).

Back to top

© 2023 Lhasa Limited | Registered office: Granary Wharf House, 2 Canal Wharf, Leeds, LS11 5PS, UK Tel: +44 (0)113 394 6020
VAT number 396 8737 77 | Lhasa Limited is registered as a charity (290866)| Company Registration Number 01765239 (England and Wales).