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Numazu, Japan

Krug L.M.,Sloan Kettering Cancer Center | Wozniak A.J.,Karmanos Cancer Center | Kindler H.L.,University of Chicago | Feld R.,Princess Margaret Hospital | And 12 more authors.
Lung Cancer | Year: 2014

Background: CBP501, a synthetic duodecapeptide, increases cisplatin influx into tumor cells through an interaction with calmodulin enhancing cisplatin cytotoxicity, and effects cell cycle progression by abrogating DNA repair at the G2 checkpoint. In phase I clinical trials of CBP501 alone or in combination with cisplatin, the most common toxicity was infusion-related urticaria. Activity of CBP501 plus cisplatin was observed in patients with ovarian cancer and mesothelioma, including some patients previously treated with cisplatin. Methods: Chemotherapy naïve patients with unresectable MPM were stratified by histology and performance status, and randomized 2:1 to pemetrexed/cisplatin plus CBP501 25mg/m2 IV (Arm A) or pemetrexed/cisplatin alone (Arm B). The primary endpoint was progression free survival (PFS) at 4 months. Results: 65 patients were randomized, and 63 were treated. Patient characteristics in the two arms were balanced. Based on independent radiology review of the treated population, 25/40 patients (63%) in Arm A and 9/23 (39%) in Arm B had PFS. ≥. 4. mo; the median PFS was 5.1. mo (95% CI, 3.9, 6.5) vs 3.4. mo (2.5, 6.7). Median OS was 13.3. mo (9.2, 16.3) in Arm A and 12.8 (6.5, 16.1) in Arm B. Adverse events were not different than expected from standard chemotherapy, and comparable in the two arms, aside from infusion reactions which occurred in 70% of patients treated with CBP501. Conclusions: While this randomized phase II trial met its primary endpoint of PFS at 4 months, other parameters such as response rate and overall survival suggest that the addition of CBP501 does not improve the efficacy of standard chemotherapy for MPM. © 2014 Elsevier Ireland Ltd.

CanBas Co. | Date: 2015-05-21

Disclosed herein, inter alia, are methods and uses for treating a cancer in a subject. In various embodiments, a method or use includes measuring expression of nuclear factor erythroid-2 related factor 2 (NRF2), or an NRF2 target gene, in a candidate subject having cancer, or a cancer sample from the candidate subject, and determining the amount of NRF2 in the sample or in the subject having cancer, then comparing the amount of NRF2 determined, or NRF2 target gene determined, to a baseline or reference amount of NRF2 or NRF2 target gene. If the amount of NRF2 or NRF2 target gene in the sample or in the subject having cancer is less than the baseline or reference amount of NRF2 or NRF2 target gene, the subject having the cancer may be or is treated with a peptide or peptidomimetic sequence set forth herein, such as P1, P2, P3, P4, P5, P6 (SEQ ID NO:1) or P6, P5, P4, P3, P2, P1 (SEQ ID NO:2), e.g., CBP501.

This invention provides compounds including peptides and peptidomimetics that can be used to treat cell proliferative disorders, such as those associated with benign and malignant tumor cells. While the invention is not limited to any particular mechanism, the compounds of the invention appear to function at least in part by inhibiting G2 cell cycle checkpoint. Thus, invention compounds can be used to inhibit cell growth alone or be used in combination with a nucleic acid damaging treatment to inhibit cell growth.

Sakakibara K.,CanBas Co. | Saito N.,CanBas Co. | Sato T.,CanBas Co. | Suzuki A.,CanBas Co. | And 6 more authors.
Blood | Year: 2011

CRM1 plays an important role in the nuclear export of cargo proteins bearing nuclear exporting signal sequences. Leptomycin B (LMB), a well-known CRM1 inhibitor, possesses strong antitumor properties. However, its toxicity prevents it from being clinically useful. In this study, we demonstrate that a novel compound, CBS9106, inhibits CRM1- dependent nuclear export, causing arrest of the cell cycle and inducing apoptosis in a time- and dose-dependent manner for a broad spectrum of cancer cells, including multiple myeloma cells. CBS9106 reduces CRM1 protein levels significantly without affecting CRM1 mRNA expression. This effect could be reversed by adding bortezomib or LMB. Moreover, CBS9106-biotin allows capture of CRM1 protein by streptavidin beads in a competitive manner with LMB and vice versa. Mass spectrometric analysis shows that CBS9106 reacts with a synthetic CRM1 peptide that contains Cys528 but not with a Cys528 mutant peptide. Oral administration of CBS9106 significantly suppresses tumor growth and prolongs survival in mice bearing tumor xenograft without a significant loss in body weight.Areduced level of CRM1 protein is also observed in tumor xenografts isolated from mice treated with CBS9106. Taken together, these results indicate that CBS9106 is a novel reversible CRM1 inhibitor and a promising clinical candidate. © 2011 by The American Society of Hematology.

Saito N.,CanBas Co. | Sakakibara K.,CanBas Co. | Sato T.,CanBas Co. | Friedman J.M.,CanBas Co. | And 3 more authors.
Molecular Cancer Therapeutics | Year: 2014

Chromosome region maintenance 1 (CRM1) mediates the nuclear export of proteins and mRNAs, and is overexpressed in various cancers. Recent studies have also reported that CRM1 protein expression is a negative prognostic factor in patients with cancer. Therefore, CRM1 is considered a potential target for anticancer therapy. Our previous study demonstrated that CBS9106, a synthetic small-molecular inhibitor of CRM1, decreases CRM1 protein through proteasomal degradation without affecting CRM1 mRNA levels. However, the mechanism by which CRM1 is degraded is not well understood. Here, we demonstrate a novel signaling pathway that plays an important role in CBS9106-induced CRM1 degradation. We found that MLN4924, a selective inhibitor of NEDD8-activating enzyme (NAE), effectively inhibits cullin neddylation and attenuates CBS9106-induced CRM1 degradation in a time- and dose-dependent manner. MLN4924 also attenuated CBS9106-induced nuclear accumulation of Ran-binding protein 1 (RanBP1), cell growth inhibition, and apoptosis. Furthermore, RNAi-mediated knockdown of neddylation pathway proteins (NEDD8 and UBA3) or cullin ring ligase (CRL) component protein (Rbx1) attenuated CRM1 protein degradation and G1 phase cell-cycle arrest by CBS9106. Knockdown of CSN5 or CAND1 also partially inhibited CBS9106-induced CRM1 degradation. These findings demonstrate that CBS9106-induced CRM1 degradation is conferred by CRL activity involving the neddylation pathway, and that this response to CBS9106 leads to cell growth inhibition and apoptosis. ©2014 AACR.

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