Nivolumab, Ipilimumab and Chemoradiation in Pancreatic Cancer.

Summary

Pancreatic ductal adenocarcinoma (PDAC) remains a dreadful disease due to its often advanced stage at diagnosis and poor sensitivity to chemotherapy. A locally unresectable tumor (locally advanced pancreatic cancer (LAPC)) is present in 30% of the cases and is defined as a surgically unresectable tumor encasing the adjacent arteries \[celiac axis, superior mesenteric artery (SMA)\]. In these patients, chemotherapy has been the standard treatment for decades, optionally combined with radiotherapy. Patients with borderline resectable pancreatic cancer (BRPC) comprise a group of patients with PDAC who are at a high risk of having positive margins if upfront resection is pursued. In addition, multiple studies have reported these patients have increased probability of early recurrence of local and systemic disease resulting in poorer outcomes. Although some patients are treated with an aggressive surgery-first approach and adjuvant systemic therapies, a preoperative chemotherapy and/or chemoradiation approach is becoming more common for all patients with BRPC, and this strategy is adapted in Danish and international guidelines. Majority of patients present with metastatic pancreatic cancer (mPC). Therapy options are limited by chemotherapy in palliative setting. The superiority of the FOLFIRINOX regimen demonstrated in the phase III mPC setting led many centers to investigate FOLFIRINOX with or without chemoradiotherapy in patients with LAPC tumor. Gemcitabine combined with nab-paclitaxel is the approved first-line treatment for patients with advanced PC. This regimen showed a median progression-free survival (PFS) of 5.5 months and a median overall survival (OS) of 8.5 months and is the predominantly used regimen in metastatic PC. The role of radiation therapy in the management of nonresectable PC remains controversial. The results of small randomized trials comparing chemoradiotherapy with chemotherapy of patients with LAPC are divergent. Immunotherapy has emerged as a therapeutic approach that offers effective and durable treatment options for subsets of patients with various types of cancer. However, these successes have not manifested similar benefits for PDAC patients mostly due to a lack of pre-existing T-cell immunity and/or a highly immunosuppressive tumor microenvironment (TME). Considering the emerging role of the TME, the combination of checkpoint blocking antibodies with agents that target the inhibitory effects of the TME could lead to better responses in tumor historically resistant to checkpoint blocking antibody approaches. For example, in heavily pretreated patients with advanced/metastatic PDAC, preliminary data from the phase 2 study CHECKPAC (NCT02866383) showed that checkpoint inhibition in combination with stereotactic body radiotherapy (SBRT) provided durable clinical benefit in a small proportion of patients, including prolonged, sustained partial responses. Furthermore, the addition of standard-of-care chemotherapy could further potentiate the anti-tumor effects of immunotherapy approaches by reducing the tumor burden, exposing antigens, and directly affecting the immunosuppressive TME compartment. To explore the safety and synergy of the proposed combinatorial approach, participants with borderline resectable, locally advanced or mPC will receive nivolumab and ipilimumab administered in combination with gemcitabine and nab-paclitaxel followed by immune-chemoradiation.

Timeline

Start

2020-06-02

Primary completion

2024-05-24

Completion

2024-12-05

Drugs

Indications