By Jon E. Clark, M.S., Associate Director for Policy Development and GMPs, Office of Pharmaceutical Science, CDER, FDA
The final report from the 21st Century Initiative  has been posted for over a year now and Ajaz Hussain has left the Center for Drug Evaluation and Research (CDER) for the private sector. Dr. Hussain was an evangelist, whose efforts were instrumental in pushing the Agency toward a more scientific and risk based approach to the regulation of pharmaceutical manufacturing. We sincerely thank him for all that he has done.
Evangelistic leadership is essential to alert people of the need to change the direction of their efforts. Once theyve reached agreement on a new direction for those efforts, their work, of necessity, becomes more detailed and less apparent to the outside world.
We at CDER remain steadfastly committed to achieving the goals that Dr. Hussain articulated so well, and to improving the policies and practices that govern the way that Chemistry Manufacturing and Control (CMC) information is reviewed. In fact, we are intensifying our commitment and our efforts in this area, to ensure that the CMC review process incorporates the concepts of the 21st Century Initiative.
Separating the wheat from the chaff
Right now, we at CDER face the difficult task of identifying recommendations that are truly important and useful, and discontinuing those recommendations and other activities that are less useful, casting them off as anchors that impede progress.
We are also continuing to learn how best to allow pharmaceutical manufacturers to assume more ownership and accountability for the manufacturing controls that will improve drug quality.
We face a large and daunting task, but remain dedicated to advancing the principles that were spelled out in the FDA final report for the 21st Century Initiative. Id like to review some of the efforts now underway at CDER.
CDER has played an integral role in FDAs efforts to produce CMC guidance documents that will explain, clearly, exactly what information is expected to be contained in drug applications. However, there is a need to update some of these documents, and to eliminate others that are no longer useful.
A look at the CDER web site shows that, after a surge of CMC guidance documents that were finalized in the late 1980s and early 1990s, quite a few have lingered on as drafts not for implementation. The recommendations in these guidances dont always fit well with the recommendations from the 21st Century Initiative.
This may not seem like much of a problem. After all, the drafts are clearly labeled as not meant for implementation. Nevertheless, in the absence of better advice, many pharmaceutical companies may still use these documents as guides when they prepare applications.
CDERs CMC leaders now plan to address this problem. They will identify documents that might be problematic, assess each documents strengths and weaknesses, and group them into topical areas. They then rewrite these documents so that they incorporate more of the spirit of the 21st Century initiative .
The new, revised documents will allow for the fact that some pharmaceutical companies do not wish not to change the way they handle CMC. However, for those manufacturers who desire greater regulatory freedom, the revised documents will also emphasize a more scientific and risk-based approach.
FDA has been concerned that, if older documents are taken down but arent replaced immediately with revised versions, some manufacturers will be confused about how to proceed with documents that are already in progress, in which theyve used the older guidelines. Therefore, were identifying documents that are at least adequate, then performing a gap analysis upon which a new FDA guidance can be based.
Casting off anchors
Other anchors are also being addressed, including:
- Reducing the lag time between creating and implementing adequate training for reviewers;
- intensifying the interaction between review and field activities;
- reacting to the industrys understandable reluctance to include solid examples [of technologies or methodologies being applied] in applications.
Using process controls and monitoring to control process variability is a far more effective way to ensure product quality than employing methods that rely completely on sampling and laboratory testing after the manufacturing process is complete. The best process controls are designed so that measurement occurs with feedback to the process. Thus, the process itself becomes a lens, allowing manufacturers to focus materials to the desired characteristics.
The type of control and monitoring technology used is up to each manufacturer, and depends on the specific conditions at each manufacturing facility. It doesnt really matter whether the measurement is conducted in-line with a high degree of automation, or whether its accomplished through a sampling technique that allows the measurement to be used to adjust or end the process.
The best process monitors are designed to give the user a significant amount of confidence that the measurements are representative of the entire batch, and to ensure that the characteristic being measured is within specifications.