Introduction: There are no standard systemic therapies for the treatment of fibrolamellar carcinoma (FLC), as surgery remains the only definitive option. We share our experiences using systemic “triple therapy” (TT) with 5-fluorouracil, interferon, and nivolumab for the treatment of relapsed, refractory, metastatic, or unresectable FLC. Methods: Data from all patients who received TT from May 2018 to July 2020 were reviewed to assess response, survival, and toxicity. Results: A total of 22 patients were treated with TT, of which 14 (median age of 21 years) were evaluable. They received a median of 18 cycles (8–44). At the time of analysis, the median progression-free survival was 9 months (4.5–26), 29% longer than prior to TT, with 5 patients achieving clinical remission, 8 patients stable or improving, and 1 progression. Overall objective response (clinical remission + partial response) was 50% and tumor control rate (clinical remission + partial response + stable disease) was 93%. Two patients withdrew from treatment due to side effects. Discussion/Conclusion: Our early results support TT as a promising medical option to slow disease progression and prolong survival in high-risk patients with FLC. TT can be administered in the outpatient setting and has shown good tolerability. Further longitudinal data is needed to confirm outcomes, especially in patients still early in their treatment.

Glycosylation is ubiquitous throughout the central nervous system and altered following spinal cord injury (SCI). The glial scar that forms following SCI is composed of several chondroitin sulfate proteoglycans, which inhibit axonal regrowth. Cyclosporin-A (CsA), an immunosuppressive therapeutic, has been proposed as a potential treatment after SCI. We investigated CsA treatment in the spinal cord of healthy, contusion injured, and injured CsA-treated rats. Lectin histochemistry using fluorescently labeled lectins, SBA, MAA, SNA-I, and WFA, was performed to identify the terminal carbohydrate residues of glycoconjugates within the spinal cord. SBA staining decreased in gray and white matter following spinal cord injury, whereas staining was increased at the lesion site in CsA-treated animals, indicating an increase in galactose and N -acetylgalactosamine terminal structures. No significant changes in MAA were observed. WFA staining was abundant in gray matter and observed to increase at the lesion site, in agreement with increased expression of chondroitin sulfate proteoglycans. SNA-I-stained blood vessels in all spinal cord regions and dual staining identified a subpopulation of astrocytes in the lesion site, which expressed α-(2,6)-sialic acid. Glycosylation were altered in injured spinal cord treated with CsA, indicating that glycosylation and alteration of particular carbohydrate structures are important factors to consider in the examination of the environment of the spinal cord after injury.

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510 Background: Fibrolamellar Carcinoma (FLC) is a rare liver cancer affecting young adults without underlying liver disease. Surgery is the only proven therapy, and recurrence is common. There are no proven systemic treatments, especially for high-risk FLC (unresectable, relapse, progression, metastatic). Research suggests that immunotherapy may work. We share our experience using systemic “triple immunochemotherapy” (TT): 2 week cycles of 7 days continuous infusion 5FU or oral capecitabine, interferon alpha-2b on days 1,3,5,7 or PEG-Interferon and nivolumab on day 1. Methods: Data from all patients who received TT from 5/2018 to 9/2019 was reviewed to assess tolerability, survival and toxicity. Results: 14 patients were treated with TT of which 10 (8F,2M with a median age of 20) were evaluable. They received a median of 13 cycles (6-31). At time of analysis, the median progression free survival was 6 months, 22% longer than prior to TT, with 80% of patients (8) stable or improving, 1 progression, and 1 who died 2 months after initiating TT. For the 4 patients who achieved surgical remission, none have relapsed (PFS 9 months). Overall objective response (CR+PR) and tumor control rate (CR+PR+SD) were 60% and 80%, respectively. There were no withdrawals from treatment due to side effects, though 2 had dose adjustments. All experienced mild adverse effects, most commonly fever and headache, but only 2 patients had grade 3 toxicity. Conclusions: Our early results of TT for high-risk FLC are promising, with good tolerability and treatment response, particularly in patients who have achieved surgical CR. Further longitudinal data is needed to confirm outcomes, especially in patients still early in their treatment. [Table: see text]

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