Tumor tissue recycling - A new combination treatment for solid tumors: Experimental and preliminarily clinical research

Although H and H combination treatment (high active TIL and high sensitive drugs) as previously described to solid tumor patients is more efficient than single-agent treatments such as TIL adoptive immunotherapy, it has a short-term efficiency for the immune response to metastatic cancers. Currently, a new version of the combination of active and adoptive immune response was established: TILs, tumor vaccines and high sensitive drugs. The experimental results demonstrated that TILs from 49 cases (65) were more than 1000 expansion-fold and only 6 cases (24) less than 500 fold. The peaks of TIL ³H-TdR cytotoxicity test from 35 of 64 TTL specimens were kept from 40 to 56 days. TIL phenotypes studied here indicated CD3 80 21 CD4 37 ± 21, CD8 44 18 and HLA DR69 24 after IL2 induction, in contrast, to CD3 20 12 CD4 10 7, CD8 11 3 and HLA DR 30 16 before induction. Thirty two of 75 cases were assayed using the chemosensitivity test. The distribution of positive rates for the chemosensitivity test were slightly different in different tumors regarding tissues in liver, lung, ovary, breast, and melanoma, 2 cases with melanoma all showed negative results. The results of tumor vaccine using TNF-alpha gene transduction demonstrated that the expression of HLA Class I and HLA Class II were dramatically increased 87 and 43. After implanting tumor cells via transduced TNF-alpha retroviral vector into 6-12 week old BALB/c nude mice, only one subject of nine nude mice had a tumor weight of 2.67 g, but the control group all displayed tumors with a weight of 3.24 0.56 g. Preliminarily clinical trials also showed that the new version was obviously a promising combination.