another recent paper using this approach...

another recent paper using this approach

https://jhoonline.biomedcentral.com/articles/10.1186/s13045-017-0397-z

The hypothesis is that engineered MSCs which injected intravenously into the tumor-bearing mice would specifically migrate to tumor site and secrete Tandab (CD3/CD19) which recruits T cells to exhibit a potent antitumor immunity in combination with an IDO pathway inhibitor D-1MT. And results presented here support the feasibility of this strategy.

We have demonstrated in this study that human UC-MSCs can be acted as cell-based delivery vehicles for the treatment of B cell lymphoma. Tandab (CD3/CD19) secreted from UC-MSCs effectively redirected T cells to inhibit the growth of Raji lymphoma in mouse models in combination with D-1MT. Our findings indicate that the use of UC-MSCs as vehicles for engineered-antibodies combined with immunoregulatory agents represents a potential clinical application of gene therapy for cancers.