Cyclin-dependent kinase (CDK) inhibitors in solid tumors: a review of clinical trials
E Panagiotou1, G Gomatou2, I P Trontzas2
1Oncology Unit, Sotiria General Hospital, Athens School of Medicine, 152 Mesogeion Avenue, 11527, Athens, Greece. em_panagiotou@outlook.com.
Abstract:
Cyclin-dependent kinases (CDKs) play a key regulating role in the cell cycle, which is almost universally altered in cancer, leading to sustained proliferation. Early pan-CDK inhibitors showed poor results in clinical trials for solid malignancies, as the lack of selectivity produced significant toxicity. The production of more selective inhibitors led to significant developments in cancer therapy, as CDK4/6 inhibitors in combination with endocrine therapy changed the landscape of the treatment of hormone-receptor positive (HR +) metastatic breast cancer. Recently, Trilaciclib demonstrated benefits regarding hematological toxicity compared to placebo when administered in combination with chemotherapy in small cell lung cancer. Newer agents, such as SY-5609, a selective CDK7 inhibitor, have also shown promising results in early clinical trials. In this paper, we review the data from clinical trials of CDK inhibitors in solid tumors, either as a monotherapy or in combination with other agents, with an emphasis on novel agents and potential new indications for this drug class.
Insights
Cyclin-dependent kinase (CDK) inhibitors are revolutionizing cancer treatment. Newer, selective CDK inhibitors show promise in solid tumors, offering new therapeutic options and improved outcomes.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- Cyclin-dependent kinases (CDKs) are crucial regulators of the cell cycle, and their dysregulation is a hallmark of cancer, driving uncontrolled cell proliferation.
- Early pan-CDK inhibitors faced challenges in clinical trials for solid tumors due to significant toxicity stemming from a lack of selectivity.
- The development of selective CDK inhibitors, particularly CDK4/6 inhibitors, has transformed the treatment of hormone-receptor-positive metastatic breast cancer.
Purpose of the Study:
- To review clinical trial data of CDK inhibitors in solid tumors.
- To highlight novel CDK inhibitors and their therapeutic potential.
- To explore potential new indications for CDK inhibitor-based therapies.
Main Methods:
- Review of clinical trial data for CDK inhibitors in solid tumors.
- Analysis of monotherapy and combination treatment regimens.
- Focus on novel agents and emerging therapeutic strategies.
Main Results:
- Selective CDK inhibitors, such as CDK4/6 inhibitors, have shown significant efficacy, particularly in HR+ metastatic breast cancer.
- Trilaciclib has demonstrated benefits in mitigating chemotherapy-induced hematological toxicity in small cell lung cancer.
- Newer agents like the selective CDK7 inhibitor SY-5609 show promising early clinical trial results.
Conclusions:
- Selective CDK inhibitors represent a significant advancement in cancer therapy.
- Ongoing research and development of novel CDK inhibitors are expanding treatment options for various solid tumors.
- CDK inhibitors hold promise for new indications and improved patient outcomes in oncology.
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