a study on Adenocarcinoma
We will be conducting a Phase II study investigating PEGPH20 in combination with gemcitabine and nab-paclitaxel in patients with borderline resectable PDAC at the Helen Diller Family Comprehensive Cancer Center at UCSF. There are multiple definitions of borderline resectable PDAC including the MD Anderson definition and the criteria developed during the Consensus Conference sponsored by the American Hepato-Pancreato-Biliary Association, Society of Surgical Oncology, and Society for Surgery of the Alimentary Tract. Borderline resectable PDAC cases will be identified per the definition developed in the currently running inter-group pilot trial for borderline resectable pancreatic cancer (NCT01821612). Per this trial, borderline resectable PDAC is defined as "presence of any one or more of the following on CT: - An interface between the primary tumor and the superior mesenteric vein or portal vein (SMV-PV) measuring ≥ 180° of the circumference of the vessel wall - Short-segment occlusion of the SMV-PV with normal vein above and below the level of obstruction that is amenable to resection and venous reconstruction - Short segment interface (of any degree) between tumor and hepatic artery with normal artery proximal and distal to the interface that is amenable to resection and reconstruction. - An interface between the tumor, and SMA measuring < 180º of the circumference of the vessel wall. This trial will be conducted in two parts. In Part I, pre-treatment EUS-guided core biopsies of the pancreatic tumor, CA 19-9 levels and functional MRIs including DCE-MRI and DWI-MRI will be obtained for the first fifteen patients enrolled. After a 1-week run-in period with PEGPH20 on days 1 and 4, patients will have repeat EUS-guided core biopsies, functional MRI, CA 19-9 level and baseline CT chest, abdomen and pelvis. Subsequently, patients will be started on treatment with PEGPH20, gemcitabine and nab-paclitaxel given weekly for 3 weeks, every 28 days. To evaluate the disease response to treatment, CA 19-9 levels will be checked monthly and restaging CT chest, abdomen and pelvis will be obtained every 8 weeks. If there is disease progression at any point in the study, patients will be taken off of study and alternative treatments will be offered. At the completion of 4 cycles of therapy, restaging CT scans will be obtained to determine resectability. If the patients are found to have resectable disease, an additional functional MRI will be obtained to evaluate the PDAC stroma. If the patients are able to have successful surgeries, tissue analyses will be performed on the resected pancreatic tumor. These patients will then proceed to get 2 cycles of adjuvant chemotherapy with gemcitabine and nab-paclitaxel. If the patients are deemed to be surgical candidates but are found to have unresectable disease in the operating room, an intraoperative core biopsy of the pancreatic tumor will be obtained for tissue analyses. At the time of initiation of therapy with PEGPH20, patients will be started on prophylactic dose of enoxaparin 1 mg/kg subcutaneous daily. This will be continued throughout the study participation. In Part II, an additional 21 patients will be enrolled, and will begin neoadjuvant therapy with PEGPH20, gemcitabine and nab-paclitaxel without the 1 week run-in of PEGPH20-only or the pre- and post-run-in EUS-guided biopsies.
Perioperative Stromal Depletion Strategies in Pancreatic Ductal Adenocarcinoma
For Specific Aim 1, we will be monitoring the post-operative complication of clinically relevant pancreatic fistula within one week of surgery per the standard clinical guidelines as noted above. Common clinical presentations of pancreatic fistula include abdominal pain, leukocytosis and fever (temperature>100.4 degrees). Diagnostic work-up of pancreatic fistula will be with CT abdomen with contrast, which has a sensitivity of 63% and specificity of 83% for detecting pancreatic fistula. The pancreatic fistulas will be categorized into grades A, B or C as previously reported. Our study will be investigating only clinically relevant pancreatic fistulas, i.e. grades B or C. Depending on the grade of pancreatic fistula, patients will be treated as indicated with conservative treatment options including bowel rest, antibiotics, somatostatin analogues and percutaneous drainage or surgical re-exploration. We will also track other relevant post-operative complications such as delayed wound healing, development of wound dehiscence or wound infection.
The tissue analyses will include review of the immunohistochemical (IHC) stains for actin, hyaluronic acid staining with binding protein probe, proliferation as measured by ki-67% and Phospho-histone H3 (Ph-H3); cell apoptosis as evaluated by IHC stain for cleaved caspase 3 (CC3) and Tunel. If limited tissue sample is obtained via the core biopsies, the priority of tissue analysis will be as follows: (1) fixed in formalin for H&E and IHC (Ph-H3; CC3/Tunel; HA binding); (2) fixed in OCT such that IHC with difficult antibodies can be done (to potentially obtain mRNA or DNA). The IHC studies will be done at the UCSF Helen Diller Family Comprehensive Cancer Center Immunohistochemistry and Molecular Pathology Core. The tissue analyses of the biopsy and surgical specimens will be done by study pathologist.
The CT and MR imaging analyses will be performed at the Abdominal Imaging at UCSF. To decrease the impact that metal stents may have on the functional MRI results, we will include only patients who have plastic stents in our study. In addition, to reduce variability in results, the DCE-MRI and DWI-MRI will be obtained on the same MR machine at a similar time of day as the baseline scan. The DCE-MRI images will be analyzed by calculating Ktrans and DWI-MRI images will be analyzed by calculating ADC as described elsewhere. We will scan patients in a torso coil on a 3T clinical MR scanner. Imaging will include MR diffusion with b-values of 0, 125, and 500 for estimates of perfusion and tumor, and dynamic contrast-enhanced MR imaging (DCE-MRI) for measurement of Ktrans, blood volume, and blood flow. The region of tumor will be determined by MR imaging in reference to the baseline CT scans. The native T1 of the pancreas and liver will be calculated from a series of four, 3D, spoiled gradient recalled echo (SPGR) sequences with different flip angles. The conventional DCE-MRI will be acquired as a 3D, fast spoiled gradient echo sequence, covering the targeted areas of the pancreas or liver, at a temporal resolution of 5 sec over 6 minutes after the administration of 0.1 mmol/kg gadobenate dimeglumine. DCE-MRI images will be post-processed using MIStar software (Apollo Medical Imaging, Melbourne, Australia), which allows for motion correction to account for any shifts in data. Datasets with artifacts will be eliminated before further post processing. After contrast delivery, the new T1 is calculated and is presumed to change with the Gd concentration such that [Gd] = (1/T1-1/T10)/R1 where R1 is assumed to be 4.5 sec-1 mmol/L-1 at 3T.
Run-in Period with PEGPH20
PEGPH20 3 ug/kg Dexamethasone 8mg PO 1-2 hours pre-PEGPH20 and PO 8-to-12 hours post-PEGPH20
*Start enoxaparin 1 mg/kg subcutaneous daily on day 1 (to be continued throughout the trial)
Cycle 1 and onward
-Day 1, 8, 15
PEGPH20 3 ug/kg + Gemcitabine 1000mg/m2 + nab-Paclitaxel 125mg/m2 Dexamethasone 8mg PO 1-2 hours pre-PEGPH20 and PO 8-to-12 hours post-PEGPH20
Adenocarcinoma Pancreatic Gemcitabine Paclitaxel Albumin-Bound Paclitaxel
Open to people ages 18 years and up
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