fermentation technology: Japanese P2 study shows potential of combined vaccine and steroid drug in castration-resistant PCa

Japanese P2 study shows potential of combined vaccine and steroid drug in castration-resistant PCa

Public release date: 15-Mar-2013
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Contact: Ivanka Moerkerken
i.moerkerken@uroweb.org
31-026-389-0680
European Association of Urology

Arnhem, 11 March 2013- Multi-peptide vaccination therapy combined with the low-dose steroid drug dexamethasone shows promise in treating chemotherapy-naive castration resistant prostate cancer (CRPC) patients.

The study, which won the third prize for best abstract in oncology at the 28th European Association of Urology Congress held in Milan, Italy from 15 to 19 March, showed the promising benefit of this combination therapy in patients who are chemotherapy-naive or those not yet exposed to specific antigens.

"Results of our randomized prospective study suggest that multi-peptide vaccination therapy in combination with low dose dexamethasone has the therapeutic potential as a safe and efficient option for chemotherapy-nave CRPC patients," said lead study author Dr. Takahiro Kimura, of the Jikei University School of Medicine, Dept. of Urology, Tokyo, Japan.

Since immunotherapy does not have a strong ability to decrease tumour burden, it is considerably difficult to evaluate the full extent of a significant therapeutic effect with peptide vaccines, explained Kimura. "Taking this into consideration, the present evidence is promising," he said.

The researchers have previously developed MHC class-I restricted peptide vaccines for prostate cancer and carried out a phase 1 trial to assess safety and immunological evaluation. In the present study, Kimura and his colleagues conducted a randomized phase 2 study to evaluate the efficacy of peptide vaccine therapy for chemotherapy nave CRPC patients.

Early stage CRPC (PSA
Kimura said that although percentage PSA decline is the same in both vaccination/dexamethasone and dexamethasone alone group, PSA-PFS was significantly longer (p
"This means that the anti-tumour immune response may play an important role in suppressing disease progression. This therapeutic strategy using peptide vaccines is likely to be comparable as that from currently developed anti-androgenic agents such as abiraterone acetate, MDV3100," Kimura noted.

Castration resistant prostate cancer is a difficult patient group to manage since although a number of therapeutic modalities have been developed, none have lived up to the full expectations and treatment options remain limited.

Kimura added that although the concept of immunotherapy for cancer is not new, recent technological advances have opened new avenues to explore and optimize peptide-based immunotherapy.

"Since the anti-tumour effects of peptide vaccination are driven by different mechanisms as those from ADT and chemotherapy, we may circumvent many of the pitfalls experienced with the current therapies. We believe that this treatment approach will be key in order to achieve a breakthrough as a new therapeutic option for CRPC," he said.

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Japanese P2 study shows potential of combined vaccine and steroid drug in castration-resistant PCa Public release date: 15-Mar-2013
[ | E-mail | Share ]
Contact: Ivanka Moerkerken
i.moerkerken@uroweb.org
31-026-389-0680
European Association of Urology