Biovest has announced that the National Cancer Institute (NCI) has presented outcomes at this past weekend's American Society of Clinical Oncology annual meeting from a Phase II BiovaxID lymphoma vaccine clinical trial.
The results of the clinical trial showed that vaccination with BiovaxID following rituximab combination chemotherapy induced nearly universal T-cell immune responses that strongly correlated with overall survival (OS) and time-to-next treatment benefits in patients with the aggressive B-cell non-Hodgkin's lymphoma, mantle cell lymphoma (MCL).
"We found that among MCL patients treated with a hybridoma-based idiotype vaccine, patients who had T-cells that produced GM-CSF when exposed to tumor antigen had a significantly longer survival and delayed time to next treatment compared to patients who did not have GM-CSF producing T-cells," Said principal investigator Wyndham H. Wilson, M.D., Ph.D., Chief of the Lymphoma Therapeutics Section at NCI and the of the MCL study, "Interestingly, studies have shown that GM-CSF producing T-cells are important for promoting autoimmunity, which is what we hope an antitumor vaccine will do. In the latter case, the autoimmunity is against a tumor antigen and not a normal cell."
The study (involving 24 participants), with 122 months of median potential follow-up, showed a median overall survival of 104 months, a time that exceeded reported historic OS rates for 'low-risk' MIPI patients and substantially exceeding reported historic overall survival rates for 'high-risk' and 'intermediate-risk' MIPI patients.
In sum, the study shows a statistically-significant association between OS and specific vaccine-induced anti-tumor GM-CSF cytokine (T-cell) responses.
Sattva S. Neelapu, M.D., Associate Professor at the Department of Lymphoma/Myeloma, Division of Cancer Medicine, MD Anderson Cancer Center, co-investigator of this Phase II study and an investigator on another trial, noted that "These results complement the body of data supporting the safety and efficacy of BiovaxID."
Source: MarketWatch