I have always said that the absence of individual patient-level data is a huge problem for the FDA, heck the American Brain Tumor Association raised the same problem.
An FDA proposal to require the inclusion of patient-level data in marketing applications may prevent the use of external controls for some rare diseases, the American Brain Tumor Association said in their comment. “[I]ndividual patient-level data (IPD) is not always available for many cancers and other rare diseases,” they wrote. “This is due to many barriers that interfere with data sharing in healthc
That might make sense for a well funded company. Alas, Northwest is not a well funded company.
If they filed with the FDA and the FDA requested an additional trail it would put Northwest in possibly a terminal situation.
Much better to reduce the risk as much as possible by going to the UK where the regulators already have a lot of experience with DCvax-l. The production facilities are located in the UK, and those facilities have already been inspected and certified.
Then there is the production capacity issue. It is quite likely that a US approval would swamp the production facilities.