Pathologically successful conversion hepatectomy for advanced giant hepatocellular carcinoma after multidisciplinary therapy: A case report and review of literature

Abstract

BACKGROUND

Hepatocellular carcinoma (HCC) is one of the leading causes of death due to its complexity, heterogeneity, rapid metastasis and easy recurrence after surgical resection. We demonstrated that combination therapy with transcatheter arterial chemoembolization (TACE), hepatic arterial infusion chemotherapy (HAIC), Epclusa, Lenvatinib and Sintilimab is useful for patients with advanced HCC.

CASE SUMMARY

A 69-year-old man who was infected with hepatitis C virus (HCV) 30 years previously was admitted to the hospital with abdominal pain. Enhanced computed tomography (CT) revealed a low-density mass in the right lobe of the liver, with a volume of 12.9 cm × 9.4 cm × 15 cm, and the mass exhibited a “fast-in/fast-out” pattern, with extensive filling defect areas in the right branch of the portal vein and an alpha-fetoprotein level as high as 657 ng/mL. Therefore, he was judged to have advanced HCC. During treatment, the patient received three months of Epclusa, three TACE treatments, two HAIC treatments, three courses of sintilimab, and twenty-one months of lenvatinib. In the third month of treatment, the patient developed severe side effects and had to stop immunotherapy, and the Lenvatinib dose had to be halved. Postoperative pathological diagnosis indicated a complete response. The patient recovered well after the operation, and no tumor recurrence was found.

CONCLUSION

Multidisciplinary conversion therapy for advanced enormous HCC caused by HCV infection has a significant effect. Individualized drug adjustments should be made during any treatment according to the patient's tolerance to treatment.

Key Words: Hepatocellular therapy; Conversion hepatectomy; Interventional therapy; Epclusa; Lenvatinib; Sintilimab; Case report

Core Tip: The present study describes the excellent efficacy of conversion therapy including interventional therapy, anti-hepatitis C virus therapy, and immunotargeted therapy for advanced giant hepatocellular carcinoma (HCC). After 21 months of conversion therapy, the patient underwent surgical resection completely and the postoperative pathology suggested a complete response. In summary, conversion therapy is a promising treatment option for unresectable HCC patients.

INTRODUCTION

At present, primary liver cancer is the fourth most common malignant tumor in China and the second most common cause of death[1]. It has seriously threatened the life and health of Chinese people, and hepatocellular carcinoma (HCC) accounts for the majority of of this disease[2]. Several liver diseases, such as hepatitis virus infection, alcoholism, and nonalcoholic fatty liver disease, are often associated with the development of HCC[3-5]. When diagnosed, more than 80% of patients are in the advanced stage when they are diagnosed and have obvious resistance to conventional chemotherapy and radiotherapy[6-8].

Conversion therapy is an effective method for transforming unresectable HCC into resectable HCC[9,10]. However, large tumors and portal vein invasion contribute to a poor prognosis in all stages of HCC[11]. In recent years, immunotargeted therapy has become an attractive and promising approach because it can improve the efficacy of antitumor drugs[12]. Lenvatinib, a newly developed polytyrosine kinase inhibitor, has a stronger effect on tumor vasculature and a greater tumor regression effect than does sorafenib[13]. Moreover, the development of immunotherapy has also promoted the treatment of advanced HCC[14]. Sintilimab, a programmed cell death factor-1 (PD-1) inhibitor, was introduced into clinical practice in 2018 and has now become an important therapy for patients with advanced HCC[15].

For people with hepatitis C virus (HCV), antiviral treatment can help prevent further damage to the liver from the virus. The earlier the time of antiviral treatment, the better the therapeutic effect. Epclusa is a single tablet fixed-dose compound preparation composed of two potent active antiviral ingredients. The drug has few side effects and a 98% cure rate for HCV[16].

Transcatheter arterial chemoembolization (TACE) is the main treatment method for primary liver cancer patients who cannot be treated by radical surgery[17]. TACE is less traumatic than the other surgical methods, significantly improves the therapeutic efficacy of patients and prolongs patient survival. In hepatic arterial infusion chemotherapy (HAIC), which is another local interventional therapy used in treating HCC, chemical drugs are delivered directly to the tumor vessel through hepatic arterial infusion. In 2013, EACH released the FOLFOX regimen (oxaliplatin + calcium folinate + 5-fluorouracil), which has good efficacy in the treatment of advanced HCC, and confirmed for the first time that the FOLFOX protocol can improve the survival rate of HCC patients[18].

To our knowledge, few studies have reported that patients with giant advanced HCC caused by hepatitis C successfully underwent surgical resection and achieved a pathological complete response after individualized conversion therapy.

CASE PRESENTATION

Chief complaints

A 69-year-old male patient who presented with abdominal pain for several days was admitted to the Shanghai Tenth People's Hospital on November 9, 2021.

History of present illness

The patient presented with abdominal pain that started 1 wk prior to hospitalization, and ultrasound indicated a space-occupying lesion in the right liver, so he was hospitalized.

History of past illness

The man underwent subtotal gastrectomy 30 years prior to treating the bleeding from a gastric ulcer, and the patient was infected with HCV through an intraoperative blood transfusion and visited a primary doctor. However, he did not receive any therapy for HCV. Before the tumor was discovered, the patient was in poor health and had cirrhosis resulting in hypersplenism and ascites, atrial fibrillation, and malnutrition.

Personal and family history

The patient had been smoking and drinking for more than 40 years and had stopped smoking 10 years prior. The patient had no significant family history.

Physical examination

Physical examination revealed light pressure pain in the right upper abdomen and a hard liver upon palpation.

Laboratory examinations

Venous blood was collected, and the indicators in Table 1 were measured.

Table 1 Local laboratory data before the initiation of therapy in a 69-year-old man with advanced hepatocellular carcinoma with invasion of the right branch of the portal vein.

Variables	Value	Unit
AFP	657	ng/mL
WBC	3.18	109/L
Hemoglobin	104	g/L
Platelet	95	109/L
ALT	36.7	U/L
AST	102.8	U/L
ALP	212	U/L
γ-GTP	111.1	U/L
Albumin	25.7	g/L
T-BIL	15.3	umol/L
D-BIL	7.6	umol/L
PT	13.6	s
APTT	31.2	s
TT	19.1	s
Fibrinogen	2.16	s

γ-GTP: γ-glutamyl transpeptidase; AFP: Alpha-fetoprotein; ALP: Alkaline phosphatase; ALT: Alanine aminotransferase; AST: Aspartate aminotransferase; D-BIL: Direct bilirubin; T-BIL: Total-bilirubin; PT: Prothrombin time; APTT: Activated partial thromboplastin time; TT: Thrombin time; WBC: White blood cell.

Imaging examinations

Enhanced computed tomography (CT) of the upper abdomen showed a low-density mass in the right lobe of the liver, with a volume of 12.9 cm × 9.4 cm × 15 cm; this mass exhibited a “fast-in/fast-out” pattern, with extensive filling defect areas in the right branch of the portal vein (Figure 1A and B). In addition, CT revealed that the total liver volume was 2764 cm³, the residual liver tissue was 786 cm³, and the residual liver tissue/total liver volume was 0.2843 (Figure 2).

Figure 1 Contrast-enhanced computed tomography and magnetic resonance images of the patient. A: Axial images of the arterial phase before treatment; B: Axial images of the portal phase before treatment; C: Axial images of the arterial phase after 3 months of treatment; D: Axial images of the portal phase after 3 months of treatment; E: Sagittal sectional magnetic resonance image (MRI) images before surgery; F: Cross-sectional MRI images before surgery.

Figure 2 Three-dimensional computed tomography reconstruction of the liver and volume calculation. A: The total liver volume was 2764 cm³ and the residual was 786 cm³ before treatment; B: After three months of conversion therapy, the total liver volume was 1975 cm³ and the residual was 650 cm³.

FINAL DIAGNOSIS

The patient was diagnosed with advanced HCC (T4N0M0, stage IIIB) according to the 8^th edition of the American Joint Committee on Cancer TNM Classification for HCC. The tumor was judged to be unresectable because the patient had an insufficient volume of his remaining healthy liver, and he had many basic diseases and malnutrition and was Child-Pugh stage B (Table 2)[19].

Table 2 Child-Pugh scores.

Variables	1	2	3
Hepatic encephalopathy (stage)	None	1-2	3-4
Ascites	None	mild	Moderate-severe
T-BIL (umol/L)	< 34	34-51	< 51
Albumin (g/L)	< 35	28-35	< 28
Prothrombin time (s)	< 14	14-18	< 18

Child-Pugh stage A: 5-6; Child-Pugh stage B: 7-9; Child-Pugh stage C: ≥ 10.

TREATMENT

Symptomatic supportive treatment was given to improve the general condition of the patient. From the first day of hospitalization, 20 mg of albumin was administered intravenously daily for 5 consecutive days, and his albumin concentration increased from 25.7 g/L to 37 g/L. After a comprehensive analysis of the patient’s condition, TACE with epirubicin was performed first. To further increase the antitumor efficacy, the patient was given intravenous Sintilimab 200 mg of intravenous Sintilimab in combination with oral Lenvatinib 8 mg of oral lenvatinib after the first TACE treatment. During the whole treatment period, the patient received a total of 3 TACE and 2 HAIC treatments (FOLFOX regimen, oxaliplatin 150 mg + calcium folinate 200 mg + fluorouracil 3 g micropump) treatments (Figure 3). Epclusa was administered orally, 1 tablet once daily, for 3 months from the time that HCC was initially diagnosed, at which point the patient’s HCV RNA test became negative, and the patient did not develop any adverse reactions.

Figure 3 Angiography with the iodine contrast agent. A: Before the first transcatheter arterial chemoembolization (TACE) treatment on November 19, 2021; B: After the first TACE treatment on November 19, 2021; C: Before the second TACE treatment on December 10, 2021; D: After the second TACE treatment on December 10, 2021; E: Before the third TACE treatment on December 31, 2021; F: After the third TACE treatment on December 31, 2021.

OUTCOME AND FOLLOW-UP

After 3 months, CT three-dimensional CT reconstruction of the liver and volume calculations showed that the tumor size was 14 cm × 9.6 cm × 12 cm (Figure 1C and D); the total liver volume was 1975 cm³; the residual liver tissue was 650 cm³; and the residual liver tissue/total liver volume was 0.3291 (Figure 2). This finding demonstrated the effectiveness of the combined treatment regimen. Unfortunately, the patient presented with mild neutropenia (neutrophil: 1.47 × 10⁹), thrombocytopenia [platelet (PLT): 33 × 10⁹], grade 3 diarrhea, and moderate hypothyroidism (Figure 4) at the point where the immunotherapy had to be discontinued and the oral lenvatinib dose was halved. Surprisingly, after three months of anti-HCV therapy with oral Epclusa, his HCV RNA level decreased to normal, and the drug was discontinued. For neutropenia, human granulocyte colony-stimulating factor was injected as a treatment, and the neutrophil count returned to the normal range after treatment. Recombinant human thrombopoietin as an injection was used to treat the thrombocytopenia, but the PLT was still at a low level after two treatments, which may be related to the patient’s hypersplenism. Furthermore, we used smectite powder and bifico to treat his Grade 3 diarrhea. Euthyrox is one of the most commonly used drugs for the treatment of hypothyroidism and is used for the treatment of patients with subclinical hypothyroidism, but the effect was limited in these patients. After the treatment regimen was changed, the thyroid function of the man improved significantly.

Figure 4 Changes in thyroid function indices with treatment time.

After up to 21 months of treatment, the patient's liver function (Child-Pugh A) and nutritional status were significantly improved, especially his albumin concentration and weight (Figure 5), which reached the highest values during treatment, and liver enhanced magnetic resonance imaging revealed that the tumor volume had decreased to 11.2 cm × 7.3 cm × 9.4 cm (Figure 1E and F). Some of the test indicators obtained during the whole treatment of the patient are shown in Figure 6. The patient underwent partial hepatectomy one month after the end of the discontinuation of oral lenvatinib. The operation time was 236 min, and the bleeding volume was 500 mL. Two units of red blood cells were given intraoperatively.

Figure 5 Changes in body mass index over time. BMI: Body mass index.

Figure 6 Changes in laboratory indices over the time of treatment.

The postoperative pathological diagnosis revealed extensive coagulation necrosis of the tumor tissue because of the combination therapy. The arteries contained a lot of lipiodol deposition. The noncancerous liver tissue exhibited a micronodular pattern, indicating liver cirrhosis. However, no active cancer cells were found upon pathological examination (Figure 7). In other words, the patient achieved a complete pathological response.

Figure 7 Histopathology of tumor tissue after conversion therapy and resection. A and B: At low magnification (50 ×) and high magnification (200 ×), the primary lesion showed massive coagulation necrosis with lymphocyte infiltration; C and D: At low magnification (50 ×) and high magnification (200 ×), hyperplasia of the surrounding fibrous tissue and lymphocyte infiltration were visible in nontumor normal tissues; E: Macroscopic view of the patient's intrahepatic lesion.

The patient was discharged from the hospital on the 9^th d after surgery without serious complications. All tumor marker levels were within the normal range. We used a timeline figure to summarize the patient’s clinical characteristics and treatment (Figure 8).

Figure 8 Timeline of patient history development.

DISCUSSION

HCV are a group of single-stranded RNA viruses that belong to the Flaviviridae family, and HCV does not integrate with host chromosomes in vivo, as compared with those of hepatitis B virus group (HBV); therefore, the clinical characteristics of HCV-associated HCC and HBV-associated HCC may differ. It has been suggested that patients with HCV-associated HCC are older than patients without HCV-associated HCC[20], have a better prognosis, and have a lower risk of recurrence[21]. A sustained virological response can reduce the incidence of HCC in most patients with HCV. Therefore, the introduction of a direct-acting antiviral agent into HCV therapy makes HCV curable. As a result, for large HCV-associated unresectable HCC patients, the addition of antiviral therapy to conversion therapy may be beneficial.

HCC conversion therapy mainly includes immunotherapy, targeted therapy, interventional therapy, radiation therapy, traditional Chinese medicine therapy, etc. Conversion therapy for advanced liver cancer has also been described in detail by other clinicians (Table 3)[22-30], suggesting the importance of individualized therapy and multidisciplinary management in achieving surgical resection. Wei et al[22] successfully performed R0 hepatectomy after 5 months of conversion therapy in a 67-year-old man who had bulky bilobar HCC with right hepatic artery anatomic variation and achieved partial remission. Ning et al[23] performed two-stage associating liver partition and portal vein ligation for staged hepatectomy (ALPPS) for a male patient with large, unresectable HCC with HBV after TACE and immunotherapy, and the postoperative pathological diagnosis suggested a complete response. This result suggested that ALPPS may provide another salvage option for future HCC conversion therapy.

Table 3 Summary of published case reports of conversion therapy in advanced hepatocellular carcinoma patients.

Ref.	Age	Sex	Underlying liver disease	Tumor size	Symptom	Previous treatment	Pathological response rate
Wei et al[22]	67	Male	Hepatitis B	7.2 cm × 7.1 cm × 6.4 cm	Abdominal discomfort	HAIC, TACE, Immunotargeted therapy	PR
Ning et al[23]	48	Male	Hepatitis B	16.2 cm × 11.2 cm	Palpable mass	TACE, Immunotargeted therapy	PR
Ning et al[23]	54	Male	Hepatitis B	14.9 cm × 11.8 cm	Abdominal pain	TACE, Immunotargeted therapy	CR
Zhou et al[24]	69	Male	Hepatitis B	12.7 cm × 10.3 cm	None	HAIC, TAE, Immunotargeted therapy	PR
Wu et al[25]	41	Male	Hepatitis B	7.1 cm × 5.5 cm × 5.1 cm	Abdominal pain	Immunotargeted therapy	CR
Chen et al[26]	49	Male	Hepatitis B	7.1 cm × 5.5 cm	None	Immunotargeted therapy	PR
Chen et al[27]	52	Male	Hepatitis B	11.3 cm × 12.0 cm × 11.9 cm	Abdominal pain	TACE, Targeted therapy	CR
Chen et al[27]	42	Male	Hepatitis B	11.4 cm × 8.9 cm × 10.0 cm	None	HAIC, TACE, Targeted therapy	PR
Yano et al[28]	68	Male	None	7.2 cm in S1	None	Immunotargeted therapy	PR
Zhang et al[29]	67	Male	None	The largest was ≥ 10 cm	Epigastric distention	TACE, antiviral therapy	PR
Tomonari et al[30]	69	Male	Alcoholic cirrhosis	7.3 cm	Abdominal pain	TAE, targeted therapy	PR
Tomonari et al[30]	71	Female	Nonalcoholic steatohepatitis	5.8 cm in S3	None	TAE, targeted therapy	PR
Tomonari et al[30]	73	Male	Alcoholic cirrhosis	5.2 cm in S5	None	TAE, targeted therapy	PR

HAIC: Hepatic arterial infusion chemotherapy; TAE: Transcatheter arterial embolization; TACE: Transcatheter arterial chemoembolization; PR: Partial remission; CR: Complete remission.

At present, there have been breakthroughs in the systemic treatment of liver cancer that range from molecular targeted drugs to immune checkpoint inhibitors; however, single-target or immunotherapy effects are limited[31]. Numerous studies have confirmed that combined immunotargeted therapy can improve the treatment and prolong the overall survival of HCC patients, but its efficacy still cannot be used to meet clinical needs[32,33]. To further meet the patient's expectations for a good prognosis of the disease, several scholars have proposed that the combination of immunotargeted therapy and local therapy may be a potential treatment option.

Interventional therapy, including TACE and HAIC, is an effective method for treating liver cancer. TACE involves the use of a mixture of chemical drugs and iodized oil or drug-loaded microspheres to block tumor blood supply vessels, and these microspheres continuously release high concentrations of chemotherapeutic drugs to cause tumor ischemia necrosis and shrinkage[34]. In addition, TACE may improve the immune microenvironment of tumors and stimulate the exposure of neoantigens to enhance the effectiveness of immunotherapy, and the antitumor angiogenesis effect of targeted therapy and immunotherapy may also help reduce the recurrence of tumors caused by tumor angiogenesis after TACE[35]. On the other hand, HAIC involves selective insertion of a catheter into the hepatic artery without embolization or continuous infusion of chemotherapy drugs alone. Notably, HAIC is associated with less severe grade 3-4 adverse reactions than TACE, especially liver function damage, and provides necessary conditions for liver reserve function for subsequent combined treatment of unresectable liver cancer[36]. Recently, clinical experts have actively explored local treatment based on interventional therapy combined with immunotargeted therapy for HCC, which has shown good efficacy[37].

Vascular endothelial growth factor receptor, fibroblast growth factor receptor, and PLT-derived growth factor receptor alpha are the loci of lenvatinib blockade. In 2018, the REFLECT study showed that the overall survival of the patients in the lenvatinib group was not inferior to that of patients in the sorafenib group; thus, lenvatinib became the second first-line drug for unresectable HCC, overcoming the treatment dilemma associated with HCC[38]. Common side effects of lenvatinib include hypertension, hemorrhage, hypothyroidism, and diarrhea[39]. In this patient, Grade 3 diarrhea and moderate hypothyroidism occurred during the use of this drug. Hence, we halved the dose of lenvatinib after 3 months of standard treatment. After the use of this personalized treatment, the patient's treatment tolerance was significantly improved.

PD-1 inhibitors are immune checkpoint inhibitors that can prevent tumor cells from hiding and enhance the body's immune response to tumor cells by blocking the binding of PD-1 and ligands on tumor cells to play an antitumor role. PD-1 inhibitors have shown good antitumor potential in many advanced tumors[40]. The microenvironment of HCC can induce the expression of vascular endothelial growth factor and promote tumor angiogenesis, during which the expression of a variety of tumor inhibitory receptors, including PD-1 and cytotoxic T lymphocyte associated antigen 4, is upregulated[14]. PD-1 expression was found during treatment of patients with middle-stage and advanced HCC with immune checkpoint inhibitors. Theoretically, actively blocking the binding of PD-1 to its ligand can effectively improve the prognosis of patients with middle-stage and advanced HCC. Sintilimab, as one of the most commonly used PD-1 inhibitors, has become a treatment option for patients with advanced HCC and has achieved good results. The side effects of sintilimab are an issue that clinicians cannot ignore. Common side effects include diarrhea, hypothyroidism, thrombocytopenia, and liver and kidney damage[41]. In this case, the patient developed severe diarrhea, hypothyroidism, and thrombocytopenia during standard-dose immunotargeted therapy. In addition to the side effects of immunotherapy, thrombocytopenia may also be related to the hypersplenism caused by liver cirrhosis in patients. After the injection of recombinant human thrombopoietin and oral leucogen, the number of PLT increased at the initial stage of immunotherapy. However, PLT count continued to decrease after 1 month of treatment, and the immunotherapy had to be stopped after comprehensively considering the patient's situation. After stopping the drug treatment, the patient's PLTs gradually recovered.

As the world's first oral anti-HCV drug for treating all 1-6 genotypes of hepatitis C, Epclusa has had excellent clinical performance[16]. It can be used alone in patients without cirrhosis or compensatory cirrhosis or in combination with ribavirin in patients with uncompensatory cirrhosis. Epclusa has achieved a good curative efficacy in all genotypes of patients, and it is expected to eliminate genotyping tests and improve the cure rate of hepatitis C patients[42]. After three months of oral administration of Epclusa, the patient’s HCV RNA test became negative. Therefore, the drug was no longer used in follow-up treatment, and the patient did not experience common adverse effects such as headache, fatigue or nausea during treatment.

In this patient, tumor shrinkage and marked improvement in liver function were observed following immunotherapy, targeted therapy, or anti-HCV therapy combined with interventional therapy. The improvement in liver function may be due to the death of tumor cells and the regeneration of healthy liver cells. When alanine aminotransferase and aspartate aminotransferase levels are elevated during antitumor therapy, we recommend the use of glutathione and polyene phosphatidylcholine to promote liver cell repair and regeneration. Moreover, based on the Response Evaluation Criteria in Solid Tumors, the patient was judged to exhibit complete remission[43].

In summary, multidisciplinary treatments, which include conversion hepatectomy, TACE, HAIC, Epicla and immunotargeted therapy, could be potential treatment options for advanced HCC. For serious adverse drug reactions, individual treatments, such as drug adjustment, should be carried out at the same time as active symptomatic treatment to find a long-term treatment plan suitable for patients. In addition, this paper has several limitations. First, patient indicators should be tested more frequently to determine the most suitable time for surgery. Second, long-term follow-up of patients should be conducted after surgery. Third, due to the poor physical condition of the patient, no needle biopsy of liver tissue was performed before conversion therapy.

CONCLUSION

This study describes the case of an unresectable advanced HCC patient who underwent complete conversion therapy and surgical resection completely, and the postoperative pathology suggested a complete response. Moreover, the drug dose should be reasonably adjusted according to the patient's body tolerance and adverse reactions to better complete the conversion therapy.