29-year-old Hispanic woman presented to the clinic with complaints of abdominal pain, nausea, fatigue, and constipation. Laboratory tests indicated the presence of iron deficiency anemia and transaminitis. Imaging evaluation revealed marked hepatomegaly with multiple hepatic metastases and pelvic lymphadenopathy. Biopsy of the hepatic lesions showed adenocarcinoma positive for pan-cytokeratin, CMA5.2, villin, and CDX2. She was positive for tumor markers CA 19-9, CA-125, and CEA. Upon further evaluation, she was found to have colorectal cancer positive for KRAS and BRAF mutations. Unfortunately, her disease progressed rapidly and she expired within 3 months from the time of her first diagnosis. KRAS and BRAF mutations are rare enough to be considered virtually mutually exclusive but coexistent mutations appear to be a distinct molecular and clinical subset with aggressive course of illness, which is in dire need of new treatment strategies. Panitumumab and Cetuximab are approved for patients with wild type KRAS CRC. Vemurafenib is a potent inhibitor of the kinase domain in mutant BRAF and its use in BRAF mutated colon cancer remains to be well established. Our report highlights the need to obtain tissue samples from these patients for analysis and to evaluate the benefit of Vemurafenib in colorectal cancers.

e15744 Background: FOLFIRINOX (FFN) and Gemcitabine plus nab-paclitaxel (GN) have been established as first line chemotherapy in advanced pancreatic cancer (PC). But there is no head-to-head randomized trial data available to support preferable first line choice between these two regimens. Methods: We retrospectively evaluated 154 chemotherapy-naïve locally advanced and metastatic PC patients treated with FFN or GN at KU Cancer Center between January 2011 and November 2016. FFN consisted of Oxaliplatin 85mg/m2, Irinotecan 180mg/m2, 5-FU 400mg/m2 as a bolus and 2,400 mg/m2over 46 hour on days 1 and 15 every 4 weeks. GN consisted of Gemcitabine 1000mg/m2 plus nab-paclitaxel 125mg/m2 day1,8,15 every 4 weeks. We compared characteristics, efficacy and adverse events between FFN and GN. Results: 107 patients were treated with FFN and 47 patients with GN as first line therapy. Demographic and baseline characteristics (FFN/GN) were as follows: Median age 61/63 years, ECOG performance status (0-1): 90% / 83%, Gender (male): 57% / 54%, distant metastases: 52%/70%, biliary stenting: 41%/20%, locally advanced tumor: 48%/30%, pancreatic head tumors: 63%/55%, median number of cycles: 4/4 respectively. Objective response rate (13% vs. 10%), Stable disease rate (76% vs 82%) and disease control rate (89% vs. 92%, p = 0.5) were similar in FFN and in GN. Median PFS was 11.7 months (95% CI: 7.2-16.1) in FFN and 5.7 months (95% CI: 2.7-8.8) in GN [p = 0.07]. Median OS was 15.9 months (95% CI: 13.7-18.1) in FFN and 10.8 months (95% CI: 7.1 – 14.5) in GN [p = 0.17]. Incidences of grade 3 or higher adverse effects were neutropenia (33% vs. 17%), anemia (14% vs 31%), thrombocytopenia (28% vs 6%), elevated creatinine (2.8% vs 4%), elevated transminases (3.7% vs 6%), diarrhea (5% vs. 0%), and peripheral neuropathy (6% vs. 6%) respectively. Conclusions: Patients treated with FFN showed statistically better PFS compared to GN. However this difference in PFS did not translate into statistically significant difference in OS. Response rates were similar. Incidences of adverse events were relatively more with FFN compared to GN as expected.

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