Dinnen R.D.,Pancreas Center at Columbia |
Mao Y.,Pancreas Center at Columbia |
Qiu W.,Columbia University |
Cassai N.,SUNY Downstate Medical Center |
And 5 more authors.
Molecular Cancer Therapeutics
Pancreatic cancer cell lines with mutated ras underwent an alternative form of cell death (aponecrosis) when treated concomitantly with clinically achievable concentrations of arsenic trioxide, ascorbic acid, and disulfiram (Antabuse; AAA). AAA's major effects are mediated through generation of intracellular reactive oxygen species (ROS) and more than 50% decline in intracellular ATP. N-acetyl cysteine and a superoxide dismutase mimetic prevented aponecrosis and restored intracellular ATP levels. DIDS (4,40-diisothiocyanatostilbene-2, 20 disulfonic acid), the pan- Voltage-Dependent Anion Channel (VDAC), -1, 2, 3 inhibitor and short hairpin RNA (shRNA) to VDAC-1 blocked cell death and ROS accumulation. In vivo exposure ofAAAled to a 62% reduction in mean tumor size and eliminated tumors in 30% of nude mice with PANC-1 xenografts. We concluded that early caspase-independent apoptosis was shifted to VDAC-mediated "targeted" aponecrosis by the addition of disulfiram to arsenic trioxide and ascorbic acid. Conceptually, this work represents a paradigm shift where switching from apoptosis to aponecrosis death pathways, also known as targeted aponecrosis, could be utilized to selectively kill pancreatic cancer cells resistant to apoptosis. © 2013 American Association for Cancer Research. Source
Fine R.L.,Columbia University |
Gulati A.P.,Columbia University |
Krantz B.A.,Columbia University |
Moss R.A.,The New School |
And 11 more authors.
Cancer Chemotherapy and Pharmacology
Purpose: We evaluated the efficacy and safety of capecitabine and temozolomide (CAPTEM) in patients with metastatic neuroendocrine tumors (NETs) to the liver. This regimen was based on our studies with carcinoid cell lines that showed synergistic cytotoxicity with sequence-specific dosing of 5-fluorouracil preceding temozolomide (TMZ). Methods: A retrospective review was conducted of 18 patients with NETs metastatic to the liver who had failed 60 mg/month of Sandostatin LAR™ (100 %), chemotherapy (61 %), and hepatic chemoembolization (50 %). Patients received capecitabine at 600 mg/m2 orally twice daily on days 1-14 (maximum 1,000 mg orally twice daily) and TMZ 150-200 mg/m2 divided into two doses daily on days 10-14 of a 28-day cycle. Imaging was performed every 2 cycles, and serum tumor markers were measured every cycle. Results: Using RECIST parameters, 1 patient (5.5 %) with midgut carcinoid achieved a surgically proven complete pathological response (CR), 10 patients (55.5 %) achieved a partial response (PR), and 4 patients (22.2 %) had stable disease (SD). Total response rate was 61 %, and clinical benefit (responders and SD) was 83.2 %. Of four carcinoid cases treated with CAPTEM, there was 1 CR, 1 PR, 1 SD, and 1 progressive disease. Median progression-free survival was 14.0 months (11.3-18.0 months). Median overall survival from diagnosis of liver metastases was 83 months (28-140 months). The only grade 3 toxicity was thrombocytopenia (11 %). There were no grade 4 toxicities, hospitalizations, opportunistic infections, febrile neutropenias, or deaths. Conclusions: CAPTEM is highly active, well tolerated and may prolong survival in patients with well-differentiated, metastatic NET who have progressed on previous therapies. © 2013 Springer-Verlag Berlin Heidelberg. Source
Zacharia B.E.,Pancreas Center at Columbia |
Gulati A.P.,Pancreas Center at Columbia |
Bruce J.N.,Pancreas Center at Columbia |
Carminucci A.S.,Pancreas Center at Columbia |
And 6 more authors.
Background and importance: Rarely, corticotrophic pituitary tumors take on an aggressive form characterized by rapid growth, invasion into local structures, compression of cranial nerves, and possible spread to distant sites. When conventional surgery, radiation therapy, and hormones fail to control progression and symptoms, alternative therapies are needed. A novel chemotherapeutic regimen of capecitabine and temozolomide (CAPTEM), originally designed in our laboratory, demonstrated dramatic antineoplastic effects against corticotrophic pituitary tumors. Clinical presentation: We present a case series of 4 patients with aggressive, adrenocorticotrophic hormone-producing pituitary tumors who had previously depleted all surgical, radiation, and hormonal therapies and were then treated with CAPTEM. Dramatic clinical improvements in neurological deficits and Cushing symptoms were evident in all patients after treatment was initiated. Confirmed by radiographic imaging, 2 of 4 patients demonstrated complete regression of disease, 1 patient had a 75% regression, and the fourth patient has ongoing stable disease for > 4.5 years at the time of this writing. Immunohistochemical analysis of patients' tumor samples showed low O-methyguanyl methyltransferase expression and adequate levels of mismatch repair enzymes (MLH-1, MSH-2, MSH-6, and PMS-2), which are important for the in vivo efficacy of CAPTEM. Conclusion: This is the first report of prolonged antitumor response to and radiographic complete remissions as a result of CAPTEM in patients with aggressive pituitary tumors who had exhausted all other therapies. Source