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Transfer of Manipulated Tumor-associated Neutrophils into Tumor-Bearing Mice to Study their Angiogenic Potential In Vivo
Published on: July 20, 2019
Retinoic acid and interferon in human cancer: mechanistic and clinical studies
D M Moore1, D V Kalvakolanu, S M Lippman
1University of Texas M.D. Anderson Cancer Center, Houston 77030.
Abstract:
Various combinations of retinoids, metabolic and synthetic derivatives of vitamin A, and interferons (IFNs) have demonstrated synergistic antiproliferative, differentiating, and antiangiogenic activity in some human hematologic and solid-tumor systems. This synergistic antitumor activity may be due to enhanced gene expression. In several cell systems, the actions of IFNs are enhanced by differentiation of cells with retinoic acid (RA). Combined RA-IFN effects have been correlated with the induction of higher levels of IFN-stimulated genes than the levels induced by either agent alone. Natural and synthetic retinoids have been found to augment the antiproliferative activity of IFNs in several squamous cell carcinoma (SCC) and breast tumor cell lines. Results of recent clinical trials indicate substantial activity of 13-cis-RA (13cRA) combined with IFN against advanced SCC of the skin and cervix, and possibly against other solid tumors. Two phase II trials have confirmed activity against locally advanced SCC of the cervix. Successful integration of this regimen with radiotherapy appears to be the most probable means of optimizing clinical outcome. Further studies are needed to determine the mechanistic details of the RA-IFN interaction.
Insights
Combining retinoids like retinoic acid (RA) with interferons (IFNs) shows synergistic antitumor effects. This combination enhances gene expression and shows promise against advanced skin and cervical cancers, potentially with radiotherapy.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- Retinoids and interferons (IFNs) exhibit antitumor properties individually.
- Synergistic effects observed with combined retinoid-interferon (RA-IFN) therapy in preclinical models.
- RA enhances IFN action and gene expression in various cell systems.
Purpose of the Study:
- To investigate the synergistic antiproliferative, differentiating, and antiangiogenic activities of combined retinoids and IFNs.
- To explore the potential of RA-IFN combinations in treating human hematologic and solid tumors.
- To evaluate clinical outcomes of combined 13-cis-retinoic acid (13cRA) and IFN therapy.
Main Methods:
- Combination therapy studies in human hematologic and solid tumor cell lines.
- Analysis of gene expression, particularly IFN-stimulated genes.
- Clinical trials evaluating 13cRA and IFN in advanced squamous cell carcinoma (SCC).
Main Results:
- Combined RA-IFN therapy demonstrated synergistic antiproliferative, differentiating, and antiangiogenic effects.
- RA-IFN treatment induced higher levels of IFN-stimulated genes compared to individual agents.
- Clinical trials showed substantial activity of 13cRA-IFN against advanced SCC of the skin and cervix.
Conclusions:
- Combined retinoid and interferon therapy offers synergistic antitumor activity.
- The RA-IFN regimen shows significant clinical promise for advanced SCC, particularly when integrated with radiotherapy.
- Further research is required to elucidate the precise mechanistic interactions between RA and IFN.
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