DelMar Pharmaceuticals has achieved two-thirds enrollment in its ongoing Phase 2 clinical study investigating the first-line treatment of VAL-083 with radiation therapy in newly-diagnosed MGMT-unmethylated GBM. The trial, which is being conducted at the Sun Yat-sen University Cancer Center (SYSUCC) in Guangzhou, China and in collaboration with Guangxi Wuzhou Pharmaceutical Company, is designed to enroll up to 30 patients to determine whether first-line therapy with VAL-083 treatment improves progression free survival (PFS). The current standard of care is first-line temozolomide (TMZ) with radiation.
"While treating glioblastoma patients with an unmethylated MGMT promoter is particularly challenging, we have been encouraged by the enhanced levels of tumor shrinkage observed to date following treatment with VAL-083 in combination with radiation," said Professor Zhong-ping Chen, founder chairman of the Department of Neurosurgery/Neuro-oncology at Sun Yat-sen University Cancer Center, and who is also the study's principal investigator. "Having reached this two-thirds enrollment point, we look forward to seeing further results corroborating the preliminary data we've received, which does appear to support the premise that VAL-083 may provide an additional and valuable treatment option for these difficult-to-treat patient conditions."
The Phase 2 trial is a single-arm, open-label study testing VAL-083 in combination with standard radiotherapy in GBM patients who have an unmethylated promoter of the methylguanine DNA-methyltransferase (MGMT) gene. The clinical trial in newly-diagnosed GBM patients is designed to determine if first-line treatment with VAL-083 plus radiotherapy can provide improvements over the historical efficacy of standard of care temozolomide (TMZ) plus radiotherapy. Efficacy will be measured based on tumor response to treatment, progression-free survival, progression-free survival at six months, and overall survival compared to historical results in the target population.
"This first line study continues to enroll at a consistent pace, and we look forward to completing enrollment in this very important patient population. Once complete, we believe that the data from this study may provide additional support for the advancement of the adjuvant setting trial at MD Anderson Cancer Center, as well as to potentially support a future US study for utilization of VAL-083 as a first-line therapy for newly-diagnosed patients with an unmethylated MGMT gene promoter," said Saiid Zarrabian, DelMar's Chief Executive Officer. "In the meantime, we are very proud to be advancing all three of our Phase 2 programs for VAL-083, including the two-arm trial being conducted at MD Anderson Cancer Center in Texas for patients with recurrent GBM and those who have undergone surgery and chemoradiation with TMZ but will now receive VAL-083 in place of standard of care TMZ for adjuvant therapy. We look forward to continuing to provide updates on the progress of all three patient populations."
The company recently announced the initiation of an adjuvant arm to the MD Anderson study to provide early disease data on VAL-083. This arm will enroll up to 24 newly-diagnosed patients who have undergone surgery and chemoradiation with TMZ but will now receive VAL-083 in place of standard of care TMZ for adjuvant therapy. This arm is in addition to a trial arm treating patients with recurrent disease, administering VAL-083 in patients who have been heavily pre-treated with TMZ prior to disease recurrence. The recurrent arm will allow a total of 83 patients to be enrolled, and both arms are being conducted at the University of Texas MD Anderson Cancer Center.
VAL-083 (dianhydrogalactitol) is a "first-in-class," bifunctional DNA-targeting agent that introduces inter-strand DNA cross-links at the N7-position of guanine leading to DNA double-strand breaks and cancer cell death. VAL-083 has demonstrated clinical activity against a range of cancers including GBM and ovarian cancer in histo...
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