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Tata Memorial Centre research suggests that dying cancer cells release cell-free chromatin particles after chemotherapy and radiotherapy that can turn healthy cells into cancerous ones, an official statement from the Department of Atomic Energy said on Monday.
Addressing a press conference on Monday, Prof Indraneel Mittra from the Translational Research Laboratory, Tata Memorial Centre, Advanced Centre for Treatment, Research and Education in Cancer said, "A unique, yet dangerous property that cancer cells possess is that they can occasionally spread from the primary site to other sites in the body. This is called "metastatis" and can be difficult to treat. A growing body of research suggests that dying cancer cells release cell-free chromatin particles (cfChPs, or fragments of chromosomes), which can turn healthy cells into cancerous ones. Some of the cfChPs may fuse with healthy chromosomes and cause new tumours". He was flanked by Dr RA Badwe, Prof Emeritus, TMC and other senior researchers of TMC. A recent study examined whether chemotherapy, radiotherapy, or surgery, which generate dying cancer cells, could contribute to the cancer's metastatic spread. "To do this, researchers led by Prof Mittra grafted human breast cancer cells into immune-deficient mice to generate tumours. The mice then received treatment in the form of chemotherapy, radiotherapy, or surgery; half of them also received agents that deactivate or destroy cfChPs," the release stated. "The researchers not only found the presence of human DNA (cfChPs) and cancer proteins in the mice brains, but observed that these had increased markedly after treatment, especially after chemotherapy and radiotherapy. However, mice that had received compounds to deactivate or destroy cfChPs had minimal human cfChPs or cancer proteins in their brains. Based on these findings, the researchers speculated that cfChPs which may contain cancer-causing genes, and which have the ability to migrate through the blood stream to enter healthy cells in other organs, may cause the metastatic spread of cancer. Most importantly, the administration of cfChP-deactivating/destroying agents prevented their invasion into healthy cells thereby potentially preventing metastatic spread," it said. Citing its importance, the release said that although many patients are cured of cancer, this study uncovered a potential risk involved in current cancer treatment practices. "While chemotherapy and radiotherapy may kill the primary tumour cells, they lead to the release of cfChPs from the dying cells, which can then enter healthy cells elsewhere in the body via the blood stream and cause cancer there," the release stated. "These findings have important implications for cancer treatment policies. First, clinicians need to consider cfChPs as a potential cause of metastatic cancer spread, rather than metastasis being caused by migrating cancer cells. Secondly, cancer treatment protocols may need to include drugs/agents that deactivate/destroy cfChPs," the release stated, adding, cfChP-deactivating/destroying regimens could mitigate this problem and improve outcomes for patients," the release said. "A pro-oxidant combination of resveratrol and copper down-regulates toxicities in patients receiving high-dose melphalan for multiple myeloma (RESCU 001), it said. A combination of the widely available nutraceuticals resveratrol and copper, when used in miniscule doses, can reduce transplant related toxicities in patients with multiple myeloma. This study reaffirmed the TMC ACTREC pre-clinical findings that resveratrol-copper may prevent chemotherapy related toxicity by modulating the inflammatory cytokines. The findings have to be confirmed in a large randomized trial, as per the statement. (ANI)
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