Melanoma is the deadliest form of skin cancer. Researchers have developed a new three-drug delivery system for cancer treatment, especially metastatic melanoma. They have also shown that the system may have particular value with cancers like this that often spread through the lymphatic system.
The new technology takes advantage of nanoparticles that can migrate to, and increase the effectiveness of an attack on cancer cells in the body's lymph nodes. This can also reduce the development of drug resistance and the broader toxicity often associated with this type of chemotherapy.
The findings were made with laboratory animals, and just published in the Journal of Controlled Release by researchers from the College of Pharmacy at Oregon State University. The work was supported by an OSU startup fund, and a provisional patent has been granted for this technology.
The new OSU research, however, was able to combine three anti-cancer drugs at the same time into a nanoparticle delivery system. After injection, these nanoparticles primarily migrated to lymph nodes, acted in a synergistic manner that was more powerful than any one drug could be separately, and were able to maximize their impact in those locations while minimizing the development of drug resistance and overall toxicity.
Laboratory mice treated with this approach all survived. The therapy caused no apparent negative effects, and at least one type of the nanoparticles migrated effectively to distant lymph nodes, where the drugs significantly reduced the number of melanoma cells.
More research with animals, experiments with more aggressive forms of cancer, and eventually human clinical trials will still be needed for any treatment is available for use.
Alani said, "This could become an important advance in the treatment of any type of cancer that tends to move through the lymphatic system. This includes melanoma, but also breast, head and neck, prostate, pancreatic, lung and gastric cancers."
The researchers said, "Up to 80% of melanomas metastasize through the lymphatic system, and the tumor cells even secrete growth factors to further streamline their progress. The enlarged lymphatic vessels act as a freeway for the metastatic cells to gain access and spread to distal lymph nodes and organs."
The major drawback of existing therapies, they said, is the inability to deliver therapeutic concentrations of drugs to the lymphatic system without creating systemic toxicity. Use of drugs one at a time also tends to breed resistance to them.
The nanoparticles used to carry these cancer drugs are stable, increase the drug circulation time, and can deliver multiple drugs in a single step to the desired target, the research showed. They offer a novel therapeutic option for effective melanoma treatment, the scientists wrote in their conclusion.