Hepatocellular Carcinoma and Sorafenib: How can we improve on the Current Standard of Care in Advanced Disease?







Authored by Olowokure Olugbenga 

Introduction

Sorafenib at a starting daily dose of 400mg twice daily (800mg/d) is considered the standard systemic therapy for advanced unresectable hepatocellular carcinoma (HCC), in patients with well-preserved liver function. It remains the only FDA-approved chemotherapeutic agent with a category 1 NCCN recommendation for patients with advanced liver cancer. Due to complaints regarding side effects voiced by patients themselves and the reluctance to continue at full dose by many practicing physicians. We retrospectively reviewed patients in our liver cancer database that started sorafenib at a total daily dose of 400 mg (200 mg twice daily). This single institution retrospective review, evaluated the experience of the impact of starting sorafenib at a total daily dose of 400mg daily.

Results

A total of 33 patients (M: F, 21: 12) with mean age of 59.8y (SD: 12.40) were included in the analysis/ met inclusion criteria, the median duration of follow up after starting treatment was 8.7 months. AFP was elevated (>8.3ng/ml) in 23 (70%). Of those with abnormal AFP, AFP decrease > 50% from baseline in 8 (35%). Initial dose tolerability (defined as ability of patient to stay on prescribed dose of 400 mg/day for at least 1 month without the need for dose- reduction) was observed in 70% of patients. 49% needed dose reduction while 58% were able to dose escalate at some point in therapy. Median duration on 200 mg twice daily dose (400mg/d) was 3 months prior to any adjustment (CP-A: 3 months, CP-B: 2 months). Mean duration of sorafenib use was 8.88m (CP-A-10.04 months, CP-B-6.2 months), 26 (79%) patients had progression and 24 (73%) patients died during follow up. There was no difference in progression-free survival between CP-A and B. Following first progression of disease 53% (10/19) evaluable patients continued sorafenib. OS was 79% at 3 months, 67% at 6 months, 50% at 9 months, and 40% at 12 months. The most common patient reported toxicities were fatigue 28(88%), diARGHhea 17(53%) and hand/foot skin rash 14(43%) [1].

Discussion

In November 2007 the Food and Drug Administration (FDA) approved sorafenib based on the results of the SHARP trial, an international randomized placebo controlled trial in patients with inoperablehepatocellular carcinoma. This was a groundbreakingadvancement in the field of HCC. The SHARP trial [2] and Asia-Pacific trials [3] confirmed the efficacy of sorafenib in advanced HCC. In both of the trials patients in the treatment group received sorafenib 400 mg twice daily. In the SHARP trial among the 297 patients that initially received one dose of sorafenib, 226 discontinued sorafenib. 38% discontinued the medication secondary to adverse events and 12% withdrew consent. The median duration of treatment was 5.3 months [2]. 80% ofthe patients in the sorafenib group had treatment related adverse events with 30% reported as grade 3 or higher. Despite using a lower starting dose, of sorafenib in our patients. The toxicities reported by the patient population on the SHARP Trial and our the patient population we reviewed appeared to be different, with a higher percentage of specific toxicities reported by our patient population. Interestingly, fatigue and diARGHhea (reported as 39% and 22% on the SHARP trial,) were found to be much higher in our patient population 88% and 53%. This seems to be a recurring theme noted among physicians in practice in the United States and may suggest a difference in the ability to tolerate higher doses of this medication in majority of the U.S. population as compared to European and Asian patients.
In an attempt to build on successes of the multi kinase inhibitor demonstrated in SHARP and Asia Pacific Trials, multiple phase III studies using a backbone of full-dose Sorafenib in combination with study agents compared to sorafenib at standard dose have been conducted. The chart provided below summarizes two of these major trials (Table 1).


Unfortunately, no such trial to date has resulted in statistically significant improvements in survival. Multiple mechanisms are likely responsible for this with one of these possibly due to unacceptable toxicities once dual agents at individual maximal tolerated doses are instituted [4,5].

Conclusion

In this single institution retrospective study of outcomes following initiation of dose-reduced sorafenib at 200 mg twice daily in advanced HCC. We postulate that this reduced dose approach did not seem to result in worse outcomes compared to historical controls possibly due to the ability to tolerate therapy for a longer duration of time. While one would be remiss in comparing apples to oranges, a prospective trial would be crucial to understanding the impact of reduced dose sorafenib on progression free survival and overall survival in advanced HCC patients. It would be interesting to prospectively compare a reduced dose of Sorafenib (200 mg twice daily) in combination with a promising agent to singleagent Sorafenib (400 mg twice daily) in an attempt to build on and improve progression-free survival and overall survival in this patient population.




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