Abstract：
:It has been hypothesized that rapidly dividing tumor cells can outpace adoptively transferred antitumor lymphocytes when tumors are large. However, this hypothesis is at odds with clinical observations indicating that bulky tumors can be destroyed by small numbers of adoptively transferred antitumor T cells. We sought to measure the relative growth rates of T cells and tumor cells in a model using transgenic CD8(+) T cells specific for the gp100(25-33) H-2D(b) epitope (called pmel-1) to treat large, well-established s.c. B16 melanoma. We tested the effect of the immunization using an altered peptide ligand vaccine alone or in combination with interleukin-2 (IL-2) by analyzing the kinetics of T-cell expansion using direct enumeration. We found that pmel-1 T cells proliferated explosively during a 5-day period following transfer. Calculations from net changes in population suggest that, at the peak of cell division, pmel-1 T cells divide at a rate of 5.3 hours per cell division, which was much faster than B16 tumor cells during optimal growth (24.9 hours per cell division). These results clearly indicate that the notion of a kinetic "race" between the tumor and the lymphocyte is no contest when adoptively transferred cells are stimulated with immunization and IL-2. When appropriately stimulated, tumor-reactive T-cell expansion can far exceed the growth of even an aggressively growing mouse tumor.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Hwang LN,Yu Z,Palmer DC,Restifo NPdoi
10.1158/0008-5472.CAN-05-1679subject
Has Abstractpub_date
2006-01-15 00:00:00pages
1132-8issue
2eissn
0008-5472issn
1538-7445pii
66/2/1132journal_volume
66pub_type
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