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Updated: Apr 8, 2026

Pretargeted Radioimmunotherapy Based on the Inverse Electron Demand Diels-Alder Reaction
Published on: January 29, 2019
Cancer-targeted therapies and radiopharmaceuticals
Tilman D Rachner1, Franz Jakob2, Lorenz C Hofbauer3
1Division of Endocrinology, Diabetes and Bone Diseases, Department of Medicine III, Dresden University Medical Center , Dresden, Germany.
Abstract:
The treatment of bone metastases remains a clinical challenge. Although a number of well-established agents, namely bisphosphonates and denosumab, are available to reduce the occurrence of skeletal-related events, additional cancer-targeted therapies are required to improve patients' prognosis and quality of life. This review focuses on novel targets and agents that are under clinical evaluation for the treatment of malignant bone diseases such as activin A, src and endothelin-1 inhibition or agents that are clinically approved and may positively influence bone, such as the mTOR inhibitor everolimus. In addition, the potential of alpharadin, a novel radiopharmaceutical approved for the treatment of prostatic bone disease, is discussed.
Insights
New cancer therapies targeting bone metastases are needed. This review examines novel agents like activin A, src, and endothelin-1 inhibitors, plus approved drugs such as everolimus and alpharadin, for improved patient outcomes.
Area of Science:
- Oncology
- Bone Metastasis Research
- Pharmacology
Background:
- Bone metastases represent a significant clinical challenge in cancer care.
- Current treatments like bisphosphonates and denosumab mitigate skeletal-related events but do not improve overall prognosis.
- There is a critical need for novel, cancer-targeted therapies to enhance patient survival and quality of life.
Purpose of the Study:
- To review emerging and approved therapeutic targets and agents for managing malignant bone diseases.
- To highlight novel agents under clinical evaluation, including those targeting activin A, src, and endothelin-1.
- To discuss the role of approved drugs like everolimus and radiopharmaceuticals like alpharadin in bone metastasis treatment.
Main Methods:
- Literature review of clinical trials and research on bone metastases treatments.
- Analysis of novel molecular targets and their corresponding inhibitory agents.
- Evaluation of clinically approved drugs and radiopharmaceuticals for their impact on bone disease.
Main Results:
- Several novel agents targeting activin A, src, and endothelin-1 are in clinical development.
- Approved agents such as the mTOR inhibitor everolimus show potential benefits for bone health in cancer patients.
- Alpharadin, a radiopharmaceutical, is approved and discussed for its efficacy in prostate cancer bone disease.
Conclusions:
- Novel targeted therapies are essential to overcome the limitations of current bone metastasis treatments.
- Emerging agents and repurposed drugs offer promising avenues for improving patient prognosis and quality of life.
- Further clinical evaluation is warranted for these agents to establish their definitive role in managing malignant bone disease.
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