The
major feature of the companion diagnostic testing market is the current
domination of tests for mutations important in the prognosis and diagnosis of
non-small cell lung cancer (NSCLC), with the two market leaders being Roche and
Qiagen. According to Publisher’s forecast, in 2014, NSCLC companion diagnostic
tests account for 55% of the market by value. While more human epidermal growth
factor receptor 2 (HER2) tests are carried out, because the NSCLC tests have
been principally more expensive molecular tests, rather than the cheaper
immunohistochemistry (IHC) test that typifies HER2 testing, the value of the
NSCLC market is considerably higher.
The
companion diagnostic tests market is still evolving, but the market is led by
Roche, Qiagen, Ventana, Dako, and Leica. Roche and Qiagen dominate the
molecular testing market, while Ventana, Dako, and Leica also have a
significant presence within the important IHC market. In most segments, there
is little competition for tests, since only a few approved companion diagnostic
tests are marketed. Laboratory decisions as to which brand of test to use are
driven by clinical efficacy, which may vary considerably by regions. The
exception is breast cancer HER2 testing, which, as the longest-established
segment, has attracted the most competition.
Significant Unmet Needs
A
need to improve cancer treatment remains a significant unmet need. Besides
providing a means to identify patients who will most benefit from the emerging
targeted therapies, there is also a need to be able to better utilize existing
therapies, including chemotherapies, or even surgical interventions, through
the use of companion diagnostic tests to better stratify patients.
While
the existing tests are well regarded by physicians, for many, the differences
in hardware remain trivial and as such, there is a clear need for tests to
enable easier decision-making. This especially applies to IHC tests, which are
considered too subjective, and prone to error.
While
new tests for new needs, such as a need to prescribe a new drug, face easy
entry to the market, beyond the reimbursement challenges, new tests to replace
existing companion diagnostic tests face challenges in adoption by
laboratories, since they may not provide a clear performance improvement. New
tests typically undergo exhaustive comparison studies by hospitals, rather than
benefiting from published literature studies.
Future Landscape
A
significant barrier to increased adoption is reimbursement. Approval of new
companion diagnostic tests does not signify adoption. Adoption is highly
dependent upon reimbursement policies. If the molecular test cannot be
reimbursed, there will be low adoption. If the new therapy cannot be
reimbursed, there will be no need for uptake of the companion diagnostic test,
unless a secondary use can be found that is of utility to the physician in
managing the patient’s condition.
The
emergence of new companion diagnostic tests is also highly dependent on the
success of the drug pipeline. As a result of increased regulation, new
companion diagnostic tests are developed in parallel to a new drug, and thus,
the fate of the companion diagnostic is tied to the success of the drug during
clinical trials. Diagnostic test manufacturers can de-risk this process through
multiple partnerships, or by developing new companion diagnostic tests that are
also aimed at stratifying patients for existing therapies. If the therapy is
one for which there are already companion diagnostic tests, then the new test
faces adoption challenges. If the therapy has no existing stratification route,
then the test may gain a considerable advantage, especially if stratification
provides a clear benefit to the patient or the healthcare provider.
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