Injectable PLA Depot Composition for Long-Term Letrozole Release
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Solution Overview
Problem
Current formulations of letrozole and anastrozole for treating hormone receptor-positive breast cancer lack prolonged release capabilities, leading to daily oral administration requirements, which impact patient quality of life and are associated with surgical procedures and potential degradation of active ingredients.
Innovation Solution
Development of a letrozole composition using a sterile biodegradable thermoplastic polymer of polylactic acid (PLA) for forming in situ intramuscular implants, with controlled particle size distribution, allowing for sustained release of the drug over three to twelve months, reducing adverse side effects and improving therapeutic efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If preformed implants are used for prolonged release, then the duration of action is improved, but the manufacturing process requires high temperatures that cause degradation of the active ingredient and generate toxic impurities
Solution Approach 1:
The patent applies preliminary action by pre-mixing the active ingredient (letrozole or anastrozole) with the biodegradable polymer matrix before implant formation. This ensures uniform distribution and controlled release from the outset, eliminating the need for high-temperature extrusion processes that would degrade the active ingredient while maintaining prolonged release capability.
Solution Approach 2:
The patent changes the physical-chemical parameters of the polymer matrix by selecting specific biodegradable polymers (such as polylactic acid, polyglycolic acid, or their copolymers) with controlled molecular weight and degradation rates. This allows the implant to maintain structural integrity for prolonged release without requiring high-temperature processing, thus preventing active ingredient degradation.
2Duration of action of moving object
If preformed implants are used for prolonged release, then the duration of action is improved, but surgical procedures with large diameter needles are required for implantation
Solution Approach 1:
The patent applies preliminary action by preparing the implant as a pre-formed unit with controlled dimensions and morphology before administration. This allows the implant to be inserted through standard-sized needles via intramuscular or subcutaneous injection, eliminating the need for surgical procedures while maintaining prolonged release capability.
Solution Approach 2:
The patent employs a disposable implant design that is prepared in advance and administered via simple injection. The implant is designed to be single-use, eliminating the need for complex surgical procedures and large diameter needles, while maintaining the required duration of release through its biodegradable polymer matrix.
3Reliability
If daily oral administration is used, then the therapeutic efficacy is maintained, but the patient quality of life is reduced due to frequent dosing requirements
Solution Approach 1:
The patent applies preliminary action by pre-loading a substantial amount of active ingredient into the biodegradable polymer matrix during manufacturing. This pre-loaded implant releases the drug continuously over extended periods (up to 6 months or more), maintaining therapeutic efficacy while eliminating the need for daily oral administration, thus significantly improving patient quality of life.
Solution Approach 2:
The patent ensures continuity of useful action by designing the biodegradable polymer matrix to release the active ingredient continuously over extended periods. The controlled degradation of the polymer matrix maintains steady drug release, eliminating dosing interruptions and improving patient quality of life while maintaining consistent therapeutic efficacy.
4Reliability
If high doses of active ingredient are administered to ensure therapeutic levels, then the therapeutic efficacy is improved, but adverse side effects increase
Solution Approach 1:
The patent changes the parameter of drug release kinetics by using biodegradable polymers with controlled degradation rates. This allows lower total doses of active ingredient to be administered while maintaining sustained release profiles, thereby achieving therapeutic efficacy with reduced adverse side effects compared to high-dose oral administration.
Solution Approach 2:
The patent implements periodic action through the controlled degradation of the polymer matrix, which releases the active ingredient in controlled periods over extended durations. This periodic release pattern maintains therapeutic levels without requiring high peak doses, thereby reducing adverse side effects while ensuring consistent therapeutic efficacy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition provides stable, effective plasma levels of letrozole for at least six months, minimizing adverse side effects and improving patient adherence by eliminating daily oral dosing, with a superior clinical outcome compared to oral therapy.
Implementation Method 1
a sterile biodegradable thermoplastic polymer of polylactic acid (PLA)... for forming an in situ intramuscular implant... allowing for sustained release of the drug over three to twelve months
Implementation Method 2
suitable for forming an in situ intramuscular implant... forms one or more implants after administration
Data Source
AI summary
An injectable depot composition suitable for forming an in situ intramuscular implant is provided. The composition includes sterile biodegradable thermoplastic polymer of polylactic acid (PLA), solvent for the PLA, and drug. After administration to a subject, a corresponding implant administers 0.1-2 milligrams of nonsteroidal aromatase inhibitor every day throughout a dosing period of about six months to about one year. The composition is used to treat subjects in need thereof.