Take a look at our previous reports:



American Depositary Share; Galapagos has a Level 3 ADS listed on Nasdaq with ticker symbol GLPG and CUSIP number 36315X101. One ADS is equivalent to one ordinary share in Galapagos NV


A blood protein produced in response to and counteracting a specific antigen. Antibodies combine chemically with substances which the body recognizes as alien, such as bacteria, viruses, and foreign substances

Antigen-binding fragment (Fab)

The fragment antigen-binding (Fab fragment) is a region on an antibody that binds to antigens. It is composed of one constant and one variable domain of each of the heavy and the light chain


Laboratory tests to determine characteristics


ATALANTA-1 Phase 1/2 study with point-of-care manufactured CD19 CAR-T candidate, GLPG5101, in patients with replapsed/ refractory non-Hodgkin lymphoma (rrNHL)

Axial spondyloarthritis (AxSpA)

Axial spondyloarthritis (axSpA) is a type of arthritis. It mostly causes pain and swelling in the spine and the joints that connect the bottom of the spine to the pelvis (sacroiliac joint). Other joints can be affected as well. It is a systemic disease, which means it may affect other body parts and organs. The disease tends to run in families


B cell maturation antigen (BCMA) is a member of the tumor necrosis factor receptor superfamily that plays an important role in regulating B-cell proliferation and survival. BCMA is central to the survival of multiple myeloma cells


Biologics, also referred to as Biologicals, are those class of medicines which are grown and then purified from large-scale cell cultures of bacteria or yeast, or plant or animal cells. Biologicals are a diverse group of medicines which includes vaccines, growth factors, immune modulators, monoclonal antibodies, as well as products derived from human blood and plasma. What distinguishes biologics from other medicines is that these are generally proteins purified from living culture systems or from blood, whereas other medicines are considered as 'small molecules' and are either made synthetically or purified from plants

Black & Scholes model

A mathematical description of financial markets and derivative investment instruments that is widely used in the pricing of European options and subscription rights


Chimeric antigen receptor T cells (also known as CAR-T cells) are T cells that have been genetically engineered to produce an artificial T cell receptor for use in immunotherapy

Cash position

Current financial investments and cash and cash equivalents


CD19 is a protein found on the surface of B-cells, a type of white blood cell. Since CD19 is a hallmark of B-cells, the protein has been used to diagnose cancers that arise from this type of cell, notably B-cell lymphomas

Cell therapy

Cell therapy aims to treat diseases by restoring or altering certain sets of cells or by using cells to carry a therapy through the body. With cell therapy, cells are cultivated or modified outside the body before being injected into the patient. The cells may originate from the patient (autologous cells) or a donor (allogeneic cells)


Committee for Medicinal Products for Human Use is the European Medicines Agency's (EMA) committee responsible for human medicines and plays a vital role in the authorization of medicines in the European Union (EU)

Chronic Lymphocytic Leukemia (CLL)

Chronic lymphocytic leukemia is the most common leukemia in adults. It is a type of cancer that starts in cells that become certain white blood cells (called lymphocytes) in the bone marrow. The cancer (leukemia) cells originate in the bone marrow and migrate to the bloodstream

Complete Response Rate (CRR)

Term used for the absence of all detectable cancer after the treatment is completed


A chemical substance, often a small molecule with drug-like properties

Contract research organization (CRO)

Organization which provides drug discovery and development services to the pharmaceutical, biotechnology and medical devices industry

Crohn's disease (CD)

An IBD involving inflammation of the small and large intestines, leading to pain, bleeding, and ultimately in some cases surgical removal of parts of the bowel


Process where biological material - cells, tissues, or organs - are frozen to preserve the material for an extended period of time


A category of small proteins which play important roles in signaling in processes in the body

Cytokine release syndrome (CRS)

Condition that develops when your immune system responds too aggressively to infection or after certain types of immunotherapy, such as CAR-T-cell therapy


Phase 2 program for filgotinib in RA. DARWIN 1 explored three doses, in twice-daily and once-daily administration, for up to 24 weeks in RA patients with insufficient response to methotrexate (MTX) and who remained on their stable background treatment with MTX. DARWIN 2 explored three once-daily doses for up to 24 weeks in RA patients with insufficient response to methotrexate (MTX) and who washed out of their treatment with MTX. DARWIN 1 and 2 were double-blind, placebo-controlled trials which recruited approximately 900 patients globally and for which results were reported in 2015. DARWIN 3 is a long term extension trial in which all patients are on 200mg filgotinib, except for U.S. males who are on 100mg. The Week 156 results from DARWIN 3 were reported in 2019

Dermatomyositis (DM)

Dermatomyositis is a rare inflammatory disease. Common symptoms include distinctive skin rash, and inflammatory myopathy, or inflamed muscles, causing muscle weakness


All activities required to bring a new drug to the market. This includes preclinical and clinical development research, chemical and pharmaceutical development and regulatory filings of product candidates


Process by which new medicines are discovered and/or designed. At Galapagos, this is the department that oversees target and drug discovery research through to nomination of preclinical candidates


Phase 3 program evaluating filgotinib in CD

Dose-range finding study

Phase 2 clinical study exploring the balance between efficacy and safety among various doses of treatment in patients. Results are used to determine doses for later studies


Term to characterize a clinical trial in which neither the physician nor the patient knows if the patient is taking placebo or the treatment being evaluated


European Commission


Effectiveness for intended use


European Medicines Agency, in charge of European market authorization of new medications


A process that takes a system or service from beginning to end and delivers a complete functional solution, usually without strong reliance on third parties


EUPLAGIA-1 Phase 1/2 study with point-of-care manufactured CD19 CAR-T candidate, GLPG5201, in patients with replapsed/ refractory chronic lymphocytic leukemia (rrCLL) and small lymphocytic lymphoma (rrSLL), with or without Richter transformation (RT)


The U.S. Food and Drug Administration is an agency responsible for protecting and promoting public health and in charge of American market approval of new medications


Formerly known as GLPG0634, commercial name is Jyseleca®. Small molecule preferential JAK1 inhibitor, approved in RA and UC in the European Union, Great-Britain and Japan. Phase 4 studies in both RA and UC are ongoing


Phase 4 program evaluating filgotinib in RA


Phase 3 program evaluating filgotinib in RA


Form 20-F is an SEC filing submitted to the US Securities and Exchange Commission


The Belgian market authority: Financial Services and Markets Authority, or Autoriteit voor Financiële Diensten en Markten


Full-time equivalent; a way to measure an employee’s involvement in a project. For example, an FTE of 1.0 means that the equivalent work of one full-time worker was used on the project

G&A expenses

General & administrative expenses


Phase 2 study with GLPG3667 in patients with systemic lupus erythematous


Phase 2 study with GLPG3667 in patients with dermatomyositis


Molecule number currently known as filgotinib and Jyseleca®


A TYK2 kinase inhibitor discovered by us, topline results from the Phase 1b in psoriasis reported in July 2021


A second generation anti-CD19/4-1BB CAR-T product candidate currently in Phase 1/2 study in rrNHL


A second generation anti-CD19/4-1BB CAR-T product candidate currently in Phase 1/2 study in rrCLL/SLL with or wthout RT


A BCMA CAR-T product candidate


Inflammatory Bowel Disease. This is a general term for an autoimmune disease affecting the bowel, including CD and UC. CD affects the small and large intestine, while UC affects the large intestine. Both diseases involve inflammation of the intestinal wall, leading to pain, bleeding, and ultimately, in some cases, surgical removal of part of the bowel

Immune effector cell-associated neurotoxicity syndrome (ICAN)

Clinical and neuropsychiatric syndrome that can occur in the days to weeks following administration of certain types of immunotherapy, especially immune effector cell (IEC) and T cell engaging therapy


The study of the immune system and is a very important branch of the medical and biological sciences. The immune system protects humans from infection through various lines of defence. If the immune system is not functioning as it should, it can result in disease, such as autoimmunity, allergy, and cancer


Receiving/granting permission from/to another company or institution to use a brand name, patent, or other proprietary right, in exchange for a fee and/or royalty

Intellectual property

Creations of the mind that have commercial value and are protected or protectable, including by patents, trademarks or copyrights

Investigational New Drug (IND) Application

United States Federal law requires a pharmaceutical company to obtain an exemption to ship an experimental drug across state lines, usually to clinical investigators, before a marketing application for the drug has been approved. The IND is the means by which the sponsor obtains this exemption, allowing them to perform clinical studies

In vitro

Studies performed with cells outside their natural context, for example in a laboratory

In vivo

Studies performed with animals in a laboratory setting


Janus kinases (JAK) are critical components of signaling mechanisms utilized by a number of cytokines and growth factors, including those that are elevated in RA. Filgotinib is a preferential JAK1 inhibitor


Jyseleca® is the brand name for filgotinib


Laboratory procedure in which white blood cells are separated from a sample of blood


Type of white blood cell that is part of the immune system


Major adverse cardiovascular events; a composite endpoint frequently used in cardiovascular research


A Phase 2 semen parameter trial with filgotinib in male patients with CD or UC


Phase 2 semen parameter trial with filgotinib in male patients with RA, PsA, or AS


Japanese Ministry of Health, Labor and Welfare (MHLW), in charge of Japanese market authorization of new medications


Medicines and Healthcare products Regulatory Agency in Great Britain


Major achievement in a project or program; in our alliances, this is usually associated with a payment

Multiple myeloma (MM)

Multiple myeloma (MM) is typically characterized by the neoplastic proliferation of plasma cells producing a monoclonal immunoglobulin. The plasma cells proliferate in the bone marrow and can result in extensive skeletal destruction with osteolytic lesions, osteopenia, and/or pathologic fractures.


A new drug application (NDA) is a request to the FDA for a license to market a new drug in the U.S. A NDA must show the chemical and pharmacologic description of the drug, the results of clinical trials, and the proposed drug label

Non-Hodgkin's lymphoma (NHL)

Non-Hodgkin's lymphoma is a type of cancer that begins in the lymphatic system, which is part of the body's germ-fighting immune system. In non-Hodgkin's lymphoma, white blood cells called lymphocytes grow abnormally and form tumors throughout the body

Objective Response Rate (ORR)

The response rate is the percentage of patients on whom a therapy has some defined effect; for example, the cancer shrinks or disappears after treatment. When used as a clinical endpoint for trials of cancer treatments, this is often called the objective response rate


Phase 3 study with filgotinib in patients with axial spondyloarthritis


Field of medicine that deal with the diagnosis, treatment, prevention, and early detection of cancer

Oral dosing

Administration of medicine by the mouth, either as a solution or solid (capsule, pill) form


Contracting work to a third party


Phase 1/2 study with GLPG5301 in patients with relapsed/refractory multiple myeloma

Pharmacokinetics (PK)

Study of what a body does to a drug; the fate of a substance delivered to a body. This includes absorption, distribution to the tissues, metabolism and excretion. These processes determine the blood concentration of the drug and its metabolite(s) as a function of time from dosing

Phase 1

First stage of clinical testing of an investigational drug designed to assess the safety and tolerability, pharmacokinetics of a drug, usually performed in a small number of healthy human volunteers

Phase 2

Second stage of clinical testing, usually performed in no more than several hundred patients, in order to determine efficacy, tolerability and the dose to use

Phase 3

Large clinical trials, usually conducted in several hundred to several thousand patients to gain a definitive understanding of the efficacy and tolerability of the candidate treatment; serves as the principal basis for regulatory approval

Pivotal trials

Registrational clinical trials


A substance having no pharmacological effect but administered as a control in testing a biologically active preparation


Drug treatment is provided close to or near the patient


Pharmacovigilance Risk Assessment Committee of the European Medicines Agency, responsible for assessing all aspects of risk management of human medicines


Stage of drug research development, undertaken prior to the administration of the drug to humans. Consists of in vitro and in vivo screening, pharmacokinetics, toxicology, and chemical upscaling

Preclinical candidate (PCC)

A new molecule and potential drug that meets chemical and biological criteria to begin the development process

Product candidate

Substance that has satisfied the requirements of early preclinical testing and has been selected for development, starting with formal preclinical safety evaluation followed by clinical testing for the treatment of a certain disorder in humans

R&D operations

Research and development operations; unit responsible for discovery and developing new product candidates for internal pipeline or as part of risk/reward sharing alliances with partners


"Refractory" refers to a patient with cancer that is/has become resistant to, or does not respond to, treatment


"Relapsed" refers to a patient with cancer that develops cancer again after a period of improvement

Rheumatoid arthritis (RA)

A chronic, systemic inflammatory disease that causes joint inflammation, and usually leads to cartilage destruction, bone erosion and disability

Richter transformation

Richter transformation (RT) is an uncommon clinicopathological condition observed in patients with CLL. It is characterized by the sudden transformation of the CLL into a significantly more aggressive form of large cell lymphoma, and occurs in approximately 2-10% of all CLL patients.

S&M expenses

Sales and marketing expenses


Securities and Exchange Commission in the US


Phase 3 program evaluating filgotinib in UC patients. Full results were published in The Lancet in 2021


Salt-inducible kinase

Single-chain variable fragments (scFv)

Single-chain variable fragments (scFvs) are small-sized artificial constructs composed of the immunoglobulin heavy and light chain variable regions connected by a peptide linker

Small cell lymphocyte leukemia (SLL)

Small cell lymphocyte leukemia is a type of B-cell non-Hodgkin lymphoma, where the SLL cancer is located in lymp nodes and/or the spleen

Systemic lupus erythematosus (SLE)

An autoimmune disease, with systemic manifestations including skin rash, erosion of joints or even kidney failure


Protein that has been shown to play a role in a disease process and that forms the basis of a therapeutic intervention or discovery of a medicine

Target discovery

Identification and validation of proteins that have been shown to play a role in a disease process


Treatment Emergent Adverse Event, is any event not present prior to the initiation of the treatments or any event already present that worsens in either intensity or frequency following exposure to the treatments


Tyrosine kinase is an enzyme that can transfer a phosphate group from ATP to the tyrosine residues of specific proteins inside a cell. It functions as an "on" or "off" switch in many cellular functions. Tyrosine kinases belong to a larger class of enzymes known as protein kinases which also attach phosphates to other amino acids such as serine and threonine. GLPG3667 is a reversible and selective TYK2 kinase domain inhibitor

Ulcerative colitis (UC)

UC is an IBD causing chronic inflammation of the lining of the colon and rectum (unlike CD with inflammation throughout the gastrointestinal tract)

Variable heavy (VH) domain

The variable domain of an immunoglobulin heavy chain is a part of an antibody that binds to a specific antigen