RE: preCISION pro-chemotherapies to take back market share from immunotherapies?26 Oct 2021 17:13
People are getting far too excited here and jumping to PD-L1 inbhibitors. The treatment paradigm isn't so simple. PD1/PDL1 monotherapies are the foundation for treatment in many metastatic areas with PD1/PDL1+chemo combinations slowly becoming the new standard of care. The theory being, chemotherapy works quickly to destroy tumour cells, releases tumour associated antigens which can then be recognised by the immune system to create T-cells and the PD1/PDL1 pathway can kick in to increase T cell killing potential in the tumour types which are abudandt in PD-L1 expression. There are also IO/IO combinations e.g. PD-L1 + CTLA4 inhibitors and PD-L1 plus VEGF inhibitors i.e. in HCC.
The next step, is a plethora of new molecules including personalised cancer vaccines, T-cell bi specifics, antibody drug conjugates with anti-TIGIT molecules being the first. As well as this, immunotherapy is moving further back in the treatment pathway, from metastatic to adjuvant and then neoadjuvant.
My point is, it will take a LOT for avacta to change the game here and shape the market and this is many many years away. By all means, it could happen, but a LOT has to go right for even one molecule to go from Phase 1 to 3, attain an MHRA license (and FDA and EMA) and then gain NHS reimbursment.
Oncology is a lot more nuanced.