Implant Smaller Than a Grain of Rice Helps To Shrink Pancreatic Cancers in Mice

Houston Methodist nanomedicine researchers have found a way to tame pancreatic cancer - one of the most aggressive and difficult to treat cancers - by delivering immunotherapy directly into the tumor with a device that is smaller than a grain of rice.

In a paper recently published in Advanced Science, Houston Methodist Research Institute researchers used an implantable nanofluidic device they invented to deliver CD40 monoclonal antibodies (mAb), a promising immunotherapeutic agent, at a sustained low-dose via the nanofluidic drug-eluting seed (NDES). The result, found in murine models, was tumor reduction at a fourfold lower dosage than traditional systemic immunotherapy treatment.

“One of the most exciting findings was that even though the NDES device was only inserted in one of two tumors in the same animal model, we noted shrinkage in the tumor without the device,” said Corrine Ying Xuan Chua, Ph.D., co-corresponding author and assistant professor of nanomedicine at Houston Methodist Academic Institute. “This means that local treatment with immunotherapy was able to activate the immune response to target other tumors. In fact, one animal model remained tumor-free for the 100-days of continued observation.”

Pancreatic ductal adenocarcinoma is frequently diagnosed at advanced stages. In fact, about 85% of patients already have metastatic disease at diagnosis.

The Houston Methodist researchers are studying similar nanofluidic delivery technology on the International Space Station. Grattoni’s nanomedicine lab at Houston Methodist focuses on implantable nanofluidics-based platforms for controlled and long-term drug delivery and cell transplantation to treat chronic diseases.

Immunotherapy holds promise in treating cancers that previously did not have good treatment options. However, because immunotherapy is delivered throughout the entire body, it causes many side effects that are sometimes long-lasting, if not life-long. By focusing the delivery directly into the tumor, the body is protected from being exposed to toxic drugs and fewer side effects, essentially allowing patients undergoing treatment to have a better quality of life.

“Our goal is to transform the way cancer is treated. We see this device as a viable approach to penetrating the pancreatic tumor in a minimally invasive and effective manner, allowing for a more focused therapy using less medication,” said Alessandro Grattoni, Ph.D., co-corresponding author and chair of the Department of Nanomedicine at Houston Methodist Research Institute.

The NDES device consists of a stainless-steel drug reservoir containing nanochannels, thus creating a membrane that allows for sustained diffusion when the drug is released.

Other medical technology companies offer intratumoral drug-eluting implants for cancer therapeutics, but those are intended for shorter duration use. The Houston Methodist nanofluidic device is intended for long-term controlled and sustained release, avoiding repeated systemic treatment that often leads to adverse side effects.

Additional lab research is underway to determine the effectiveness and safety of this delivery technology, but researchers would like to see this become a viable option for cancer patients in the next five years.

Reference: Liu HC, Davila Gonzalez D, Viswanath DI, et al. Sustained intratumoral administration of agonist CD40 antibody overcomes immunosuppressive tumor microenvironment in pancreatic cancer. Adv Sci. 2023;10(9):2206873. doi: 10.1002/advs.202206873

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