Full IND Program: Exceeding Requirements for Submission

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Full IND Program: Exceeding Requirements for Submission

Thorough process designed to ensure quality and efficiency for successful submission

Streamlined strategy: Reducing processing time while increasing yield and purity

Successful IND submissions require an intense coordinated effort to meet strict requirements while balancing speed to file. The processes involved in API development must continuously adapt to changes in regulations along with the unique traits of each API to achieve successful manufacturing strategies and IND approval. Even during beginning stages of API synthesis, the most successful design incorporates adjustments based on thorough analysis of each reaction step.

The starting point is often derived through medicinal chemistry and it may not be readily scalable, safe or meet regulatory standards for purity. Designing the best synthesis route for later success with IND submission must account for all impurities while aiming to reduce steps that are impractical for scale up in terms of timing and cost.

Follow this compound through a full cycle of IND development at Avista Pharma, from modifications to the synthetic route to formulation development and API manufacturing. Ultimately, more than 10 batches of Drug Substance (DS) and Drug Product (DP) including clinical trial material were released with 9 ICH stability studies set, all under one roof.

Across the organization, our teams meet challenges like those presented here with expert analysis and rapid problem solving to ensure your submission has the highest yield with a phase appropriate purity. Through our expert design process, we ensure quality that meets or exceeds requirements for IND submission.

Route to success: From medicinal chemistry to process chemistry

Developing a synthesis route that favors higher throughput and purity is a common task for CDMOs. Medicinal chemistry routes typically produce low yields and are not scalable for manufacturing.

In this case, the medicinal chemistry route yielded between 5-10% over 8 steps with a final step volume of >250 mL/g. In addition, 5 of the steps included chromatography, which is not suitable for scale up. Many factors were considered when redesigning the synthetic route for this compound to achieve a reduction in synthesis steps from 8 to 5 steps with no chromotagraphic purifications.

Planning ahead: Support from analytical and manufacturing teams

The gains in efficiency and purity that were achieved during development would be wasted if they did not align properly with future steps in the IND submission. Our analytical and manufacturing teams are full partners in the process to ensure the best design is carried forward from the start.

In this case, method validation included forced degradation to test the detection of impurities and checking for residual solvents. Checking the methods themselves is also an important control in the overall process. In this case, the team developed ICP/MS methods for tha Elemental Impurity analysis that could stand up to the new regulatory guidlines.

Partnering closely with cross functional teams under one roof also eases a quick transition to next steps in preparing an IND submission. Here, the QC team verified the methods were suitable for release testing of the drug substance, and later, for release testing of neat powder in capsulized (PIC) drug product. Qualified reference standards were prepared, and pilot stability studies tested multiple formulations, including DS, PIC, Ora-Plus®, and Ora-Sweet®.

Dual Formulation Development: Immediate pediatric dosing and commercial formulations

Avista Pharma mounted a rapid response to study dose uniformity, in-use stability, and time to achieve initial suspendability of the drug substance in a pediatric formulation to fulfill an immediate dosing need. The formulation was developed using a mixture of Ora-Plus® and Ora-Sweet®, which contain a mixture of known excipients that cannot be adjusted. The studies determined that suspendability of the drug substance is maintained for 4 hours, with a 6-month stability window. An advantage of this formulation is its ability to be prepared in the clinical setting, however it is limited by pre-defined excipient levels. In addition, one of the preservatives (propylparaben) is discouraged in the EU.

In parallel with satisfying the requirement for an immediate formulation, Avista Pharma’s formulation teams set out to engineer a commercial formulation with adapted excipients that would be suitable for filling. By designing experiments to reverse engineer Ora-Plus® and Ora-Sweet®, the team was able to determine which excipients were required to suspend the drug substance and replace propylparaben with an alternative and regulatory-accepted preservative. Their objective was to find a design space where the formulation maintained suspendability of the API after 1 and 2 hours of initial shaking.

Finish Line: Drug Product Manufacturing

With API synthesis optimized for scale up, complete characterization of the stable form, and improved formulation, DP manufacturing of 4 batches at multiple strengths were completed within a month. Variable batch sizes were filled, ranging from 4k-30k powder in capsules utilizing multiple Xcelodoses. Manufacturing also included filling multiple weights of powder in Kylix syrup bottles for pediatric dosing in the clinic.

Avista Pharma’s support continues through clinical shipments, including QP audits, and beyond. Ongoing support for future campaigns of both API and DP, as well as stability storage and testing are part of our full commitment to your success.

Success beyond science.

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