Abstract
Background: The age of patients with advanced hepatocellular carcinoma (HCC) eligible for molecular-targeted drug treatment is increasing. We assessed liver function after lenvatinib administration according to age in patients with advanced HCC. Patients and Methods: In this retrospective, multicenter, observational study, we reviewed the records of patients with HCC who received lenvatinib treatment (March 2018-March 2020). Liver function was measured using the Albumin-Bilirubin Index (ALBI). Results: Of 119 patients, with a median age of 72.0 years, median overall survival was 15.3 months. Overall survival was significantly better in the group which maintained liver function (p=0.02). Older age (≥72 years) was associated with liver-function deterioration within 8 weeks (odds ratio=2.47, 95% confidence interval=1.06-5.75, p=0.035). The ALBI score was significantly higher in the older group at 4 and 8 weeks after lenvatinib administration. Conclusion: Lenvatinib administration was more likely to adversely affect liver function in older patients; dose adjustment should be considered in such patients.
Hepatocellular carcinoma (HCC) is a leading cause of cancer-related death worldwide, including in the Asia-Pacific region (1, 2), notwithstanding the improvement in prognosis in recent years given the advances in early diagnosis and treatment. Therefore, the age of patients with advanced HCC who are eligible for molecular-targeted drug treatment is increasing (3). Systemic therapy using molecular targeted agents is recognized as an effective treatment option for advanced unresectable HCC (4). Lenvatinib is a key drug for advanced HCC and has been shown to have high therapeutic efficacy in clinical practice (5-8). However, some patients experience rapid deterioration of liver function and have a poor prognosis. The purpose of this study was to evaluate the relationship between liver function after lenvatinib administration and patient age.
Patients and Methods
Patients. We retrospectively reviewed the records of 154 patients with HCC treated with lenvatinib at Nagasaki University Hospital and its related facilities between March 2018 and March 2020. Patients with an administration period <28 days (n=21) or incomplete records (n=14) were excluded, leaving the data of 119 patients for the analysis.
Treatment protocol. Patients with unresectable HCC were administered lenvatinib (Lenvima; Eisai Co., Ltd., Tokyo, Japan) orally. The standard dose for patients weighing more than 60 kg was 12 mg/day. The standard dose for patients weighing less than 60 kg and those with Child–Pugh class B was 8 mg/day. Decisions regarding dose reduction and discontinuation of lenvatinib were made by the individual clinician according to the lenvatinib administration guidelines. Lenvatinib continued until disease progression, unacceptable toxicity, or withdrawal of consent.
Evaluation criteria for response and adverse events. Treatment response was evaluated using contrast-enhanced computed tomography or magnetic resonance imaging in accordance with the Response Evaluation Criteria in Solid Tumors (RECIST) (9) and modified Response Evaluation Criteria in Solid Tumors (mRECIST) (10). Tumors were evaluated every 8-12 weeks, and the best response was regarded as the therapeutic effect. Drug-related adverse events (AEs) were assessed using the National Cancer Institute Common Terminology Criteria for Adverse Events, version 4.0 (11).
Assessment of liver function and relative dose intensity (RDI). Liver function was evaluated using the Albumin-Bilirubin (ALBI) score and Modified Albumin-Bilirubin grade (mALBI) (12-14). The ALBI score with grading was defined as follows: Grade 1, ≤−2.60; grade 2a, >−2.60 to −2.27; grade 2b, ≤−2.27 to ≤−1.39; and grade 3, >−1.39. Deterioration of liver function was defined as an increase in the mALBI grade within 8 weeks. The RDI was calculated by dividing the actual lenvatinib dose by the standard dose according to the patient’s body weight and liver function.
Statistical analysis. The median for continuous variables was used to divide patients into two groups. The chi-squared and Fisher’s exact tests were used to compare categorical variables. Comparisons between groups of continuous variables were performed using the Student’s t-test and Mann–Whitney U-test, as appropriate. Survival curves were generated using the Kaplan– Meier method and compared using the log-rank test. Multivariable logistic regression analysis was performed to determine the factors that were associated with a deterioration of liver function. Variables with p-values less than 0.05 in the univariate analysis were selected and included in the multivariable logistic regression model. Variables with p-values less than 0.05 were considered statistically significant. The data were analyzed using SPSS ver. 25.0 (IBM Corp., Armonk, NY, USA).
Ethical issues. All procedures in this study were performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and the ethical standards (institutional and national) of the responsible committee for human experimentation. Informed consent was provided for all patients in advance. The study protocol was approved by the Ethical Committee of Nagasaki University Hospital (confirmation number: 19041523-2).
Results
Patient characteristics. Table I shows the baseline characteristics of the 119 patients (94 men, 25 women) who were included in this study. The median age of patients at the start of lenvatinib therapy was 72.0 years. Of the 119 patients, 64 (53.8%) had mALBI grade 1 or 2a, 44 (37.0%) had extrahepatic spread, 20 (16.8%) had macroscopic portal vein invasion, and 23 (19.3%) had undergone systemic chemotherapy with sorafenib.
Patient characteristics (N=119).
OS and time to dose reduction or discontinuation of lenvatinib. The median OS was 15.3 months. The OS was significantly longer in the group which maintained their mALBI grade (p=0.024) (Figure 1). The median time to dose reduction or discontinuation was 42 days and was significantly shorter in the patients with deterioration of liver function (p<0.001) (Figure 2).
A: Kaplan–Meier curve of the overall survival of the whole patient cohort. The median overall survival was 15.3 months. B: Kaplan–Meier curves of survival according to change in liver function. Overall survival was significantly better for those whose liver function was maintained in (p=0.024).
Kaplan–Meier curves for time to dose reduction or discontinuation stratified by liver function. The time to dose reduction or discontinuation was significantly shorter among patients who experienced deterioration of liver function (p<0.001).
Baseline factors associated with the deterioration of liver function. In the univariate analysis, three factors were significantly associated with deterioration of liver function within 8 weeks: Age, macroscopic portal vein invasion, and etiology. Older age (≥72 years, odds ratio=2.47, 95% confidence interval=1.06-5.75, p=0.035) was a predictor of the deterioration of liver function within 8 weeks (Table II) in the multivariable logistic regression analysis.
Logistic regression analysis of factors associated with a deterioration of liver function within 8 weeks.
Serial changes in the ALBI score. Figure 3 shows the serial changes in the ALBI score stratified by age. The median ALBI scores in the group age ≥72 years were –2.27, –2.05, –2.06, –2.25, and –2.34 at pretreatment, 4 weeks, 8 weeks, 12 weeks, and 16 weeks, respectively. There was no significant difference in the baseline ALBI score between the older and younger groups. The ALBI score was significantly higher in the older group 4 and 8 weeks after lenvatinib administration, but there was no significant difference between the groups 12 and 16 weeks after lenvatinib administration.
Serial changes in the Albumin-Bilirubin Index (ALBI) score according to age. The ALBI score differed significantly (*p<0.05) between the age groups at 4 and 8 weeks. Data values are medians, the error bar represents the interquartile range.
Radiological response. The radiological response rates are shown in Table III. According to RECIST, four patients (3.4%) had a complete response, 18 patients (15.1%) had a partial response (15.1%), and 69 patients (58.0%) had stable disease. The objective response rate (ORR: complete + partial resonse) was 18.5%, and the disease control rate (ORR + stable disease) was 76.5%. The ORR of patients in the younger group was significantly higher than that of the patients in the older group (27.6% vs. 9.8%, respectively, p=0.02) but the disease control rate of the younger and older groups did not differ significantly (82.8% vs. 70.5%, respectively, p=0.11).
Radiological response to lenvatinib therapy.
Adverse events. Treatment-emergent AEs during lenvatinib administration are shown in Table IV. Fatigue and reduced appetite were the most common subjective AEs in the older group but there were no differences in the incidence of other AEs according to age.
Adverse events according to age.
Relative dose intensity. Figure 4 shows the RDI by week, stratified according to age. The median RDI at 8 weeks in the younger and older age groups was 77.0% and 67.5%, respectively. After 8 weeks, the younger age group tended to have a significantly higher RDI (p<0.05).
A: Relative dose intensity (RDI) by week of lenvatinib therapy. The overall RDI was 58.2%. B: RDI by week of lenvatinib therapy according to age. The younger group had a significantly (*p<0.05) higher RDI after 8, 12, and 20 weeks, and overall.
Discussion
In this study, we assessed the relationship between liver function after lenvatinib administration and age. Systemic therapy for advanced HCC is rapidly advancing, and lenvatinib is currently the preferred first-line treatment. It has been reported that lenvatinib is highly safe, even in older individuals, and has a limited effect on hepatic reserve (5, 15). The ORR to lenvatinib is high in patients with good liver function, and it is desirable to use it if liver function is maintained. However, in some cases, even if pretreatment liver function is maintained, liver function deteriorates rapidly after lenvatinib administration, and is associated with a poor prognosis (15). The ALBI score is useful as an index for assessing hepatic reserve, particularly in patients with Child–Pugh class A (14). The mALBI grade is a refinement of the ALBI score and is able to detect slight changes in liver function (12). Similar to previous reports, our study revealed that patients who experienced deterioration of liver function within 8 weeks had a poor prognosis.
Age was identified in advance as a factor affecting liver function after lenvatinib administration. In our study, older patients had higher ALBI scores, especially 4 and 8 weeks after initiating therapy, and were more likely to require dose reduction and drug discontinuation in the short term. One of the causes of liver-function deterioration in older patients may be reduced appetite. Compared with younger patients, older patients are more likely to have reduced appetite. Reduced food intake may cause the serum albumin level to decrease. There was no difference in the frequency of AEs other than fatigue, reduced appetite, and hypothyroidism between the older and younger groups (Table III). However, this does not mean that there is no difference in the therapeutic response to lenvatinib between older and younger patients. Because AEs appeared sooner, the treatment period was significantly shorter in the older group (Figure 5), and dose reduction or discontinuation was required. Therefore, it cannot be concluded that older and younger patients have a similar incidence of AEs. According to our study, there was no significant difference in the ALBI score after 12 weeks according to age. This does not appear to be attributable to an improvement of liver function in the older group but occurred because patients with worsening liver function dropped out because of drug interruption, and the analysis was limited to patients who were able to continue treatment for a long time without deterioration of liver function.
Kaplan–Meier curves for time to dose reduction or discontinuation stratified by age. The time to dose reduction or discontinuation was significantly shorter in the older age group than in the younger age group (p=0.023).
The RDI was significantly lower for the older group. This is attributable to dose reduction or discontinuation with fatigue and reduced appetite in a short period of time. The lower ORR for the older group than the younger group is likely to have occurred as a result of the reduced RDI (Figure 4). We previously reported that the RDI is important for antitumor efficacy with lenvatinib treatment (16). There are several reports of the significance of the RDI for the antitumor effect of lenvatinib (17, 18). In the older group, it may be difficult to achieve a response, especially if dose reduction or discontinuation of lenvatinib is required because of deterioration of liver function. However, no significant difference was found in the disease control rate according to age. In addition, a previous study revealed no significant difference in OS (15). Therefore, optimal dosage adjustment in older patients is required to obtain the same therapeutic benefits as younger patients.
Some of the older patients experienced rapid deterioration of liver function. In our study, baseline factors other than age were not associated with deterioration of liver function within 8 weeks. When administering lenvatinib to older patients, it may be necessary to adjust the dose to consider the body weight and hepatic reserve. The relationship between molecular targeted agents and muscle mass has also been reported, and factors other than age may need further investigation (19). Generally, dose reduction is not recommended for maintaining the RDI. However, the use of low RDI treatment in older patients with HCC should be reconsidered as a means of ensuring continuity of lenvatinib treatment. Although new drugs may be used as an alternative to lenvatinib (20), it is inappropriate to select a second-line molecular targeted agent without first considering the use of lenvatinib at a low RDI and short duration for older patients.
Limitations of this study include its retrospective nature and the requirement for the patients to have been administered lenvatinib for 28 days or longer. Patients who were unable to continue lenvatinib for at least 28 days were excluded. Further studies are required with patients who discontinue lenvatinib after a shorter period. However, unlike previous reports of the effects of lenvatinib on older patients, this was the first study to report that age affects liver function. This is an important consideration regarding lenvatinib administration to older patients who are more likely to experience AEs and in whom dose adjustment needs to be considered for an optimal therapeutic effect.
Footnotes
Authors’ Contributions
All Authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by RS, MF, MH, SM, TM, SH, YK, HS, YM, MS, SI, and NK. The first draft of the article was written by RS, and all authors commented on previous versions of the article. All Authors read and approved the final article.
Conflicts of Interest
The Authors declare that there are no conflicts of interest in regard to this study.
- Received February 7, 2021.
- Revision received February 23, 2021.
- Accepted February 24, 2021.
- Copyright © 2021 International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved.