Trial Outcomes & Findings for Efficacy, Safety and CNS Exposure of G-202 (Mipsagargin) in Patients With Recurrent or Progressive Glioblastoma (NCT NCT02067156)

Efficacy, Safety and CNS Exposure of G-202 (Mipsagargin) in Patients With Recurrent or Progressive Glioblastoma

Percentage of patients who received at least 2 cycles of G-202 and have not progressed or died within 6 months of beginning treatment with G-202. Progression is defined using Response Assessment in Neuro-Oncology Working Group (RANO) for high-grade glioma, as any of the following: by any of the following: 25% or greater increase in sum of the products of perpendicular diameters of enhancing lesions (compared with baseline if no decrease) on stable or increasing doses of corticosteroids; a significant increase in T2/FLAIR nonenhancing lesions on stable or increasing doses of corticosteroids compared with baseline scan or best response after initiation of therapy, not due to comorbid events; the appearance of any new lesions; clear progression of nonmeasurable lesions; or definite clinical deterioration not attributable to other causes apart from the tumor, or to decrease in corticosteroid dose.

Percentage of all analyzed patients experiencing treatment-emergent adverse events.

Percentage of analyzed participants experiencing a complete response (CR) or partial response (PR) using RANO criteria. CR is defined as complete disappearance of all enhancing measurable and nonmeasurable disease sustained for at least 4 weeks; no new lesions; stable or improved nonenhancing (T2/FLAIR) lesions; and patient must be off corticosteroids or on physiologic replacement doses only, and stable or improved clinically. PR is defined as at least 50% decrease, compared with baseline, in the sum of products of perpendicular diameters of all measurable enhancing lesions sustained for at least 4 weeks; no progression of nonmeasurable disease; no new lesions; stable or improved nonenhancing (T2/FLAIR) lesions on same or lower dose of corticosteroids compared with baseline scan; and patient must be on a corticosteroid dose not greater than the dose at time of baseline scan and is stable or improved clinically.

Duration of time from the first administration of G-202 until the first documented progression or date of death, assessed up to 12 months. Progression is defined using Response Assessment in Neuro-Oncology Working Group (RANO) for high-grade glioma, as any of the following: by any of the following: 25% or greater increase in sum of the products of perpendicular diameters of enhancing lesions (compared with baseline if no decrease) on stable or increasing doses of corticosteroids; a significant increase in T2/FLAIR nonenhancing lesions on stable or increasing doses of corticosteroids compared with baseline scan or best response after initiation of therapy, not due to comorbid events; the appearance of any new lesions; clear progression of nonmeasurable lesions; or definite clinical deterioration not attributable to other causes apart from the tumor, or to decrease in corticosteroid dose.

Duration of time from the first administration of G-202 until the date of death, assessed up to 12 months

PSMA immunohistochemistry staining score on tumor tissue collected prior to start of G-202 study treatment. Intensity of staining was ranked on a scale of 0, 1, 2, or 3 (with 0 representing no staining and 3 representing maximum intensity): absence of staining (0), weak staining (1), medium staining (2), or strong staining (3) relative to a staining calibration curve and normalized to the image mean background intensity. The scoring scale does not have a title nor does it have a subscale. It is not known whether PSMA staining intensity is associated with tumor molecular phenotypes or response outcome to G-202; therefore, this was an exploratory analysis. However, the lack of objective tumor response in the trial precluded comparative analysis.