Portal vein tumor thrombus (PVTT) is very common, and it plays a major role in the prognosis and clinical staging of hepatocellular carcinoma (HCC). We have published the first version of the Consensus in 2016. Over the past several years, many new evidences for the treatment of PVTT become available especially for the advent of new targeted drugs which have further improved the prognosis of PVTT. So, the Chinese Association of Liver Cancer revised the 2016 version of consensus to adapt to the development of PVTT treatment. Future treatment strategies for HCC with PVTT in China would depend on new evidences from more future clinical trials.

Hepatocellular carcinoma (HCC) is the sixth most prevalent cancer worldwide, and China accounts for more than half of new cases and deaths related to HCC every year [1]. The latest data indicated that the morbidity and mortality rates of HCC ranked the fourth and third, respectively, among all malignant tumors reported in China [2]. Given the advances in diagnosis and treatment strategies for different stages of HCC, the prognosis of HCC patients has improved. Unfortunately, 70–80% of patients are still diagnosed at an advanced stage as there are no obvious clinical symptoms at early stages. At present, the overall prognosis of HCC is not satisfactory.

Owing to the biological characteristics of liver cancer and the anatomical characteristics of the liver, HCC is prone to invade intrahepatic vessels, especially the portal venous system. In China, the incidences of portal vein tumor thrombus (PVTT) have been reported to range from 44 to 62.2% [3]. Once developed, PVTT progresses rapidly to cause portal hypertension, hepatocellular jaundice, and intractable ascites. The median survival of HCC patients with main PVTT is 2.7 months [4]. PVTT plays a major role in the prognosis and clinical staging of HCC [5, 6].

There have been no worldwide consensuses or guidelines on the diagnosis and treatment of HCC with PVTT. Guidelines in Europe and America follow the Barcelona Clinic Liver Cancer Staging (BCLC) and regard HCC with PVTT to be at BCLC Stage C. The guidelines also recommend treating HCC patients with PVTT with molecular-targeted drugs such as Sorafenib and Lenvatinib [7]. On the contrary, experts from Southeast Asian countries including China opine that multidisciplinary therapy including surgery, transcatheter arterial chemoembolization (TACE), radiotherapy (RT), and/or molecular-targeted drugs should be considered to achieve more satisfactory outcomes. But the difference is that Chinese doctors tend to use more curable treatments for the same subgroup of PVTT patients.

In May 2016, the Chinese National Research Cooperative Group for Diagnosis and Treatment of HCC with Tumor Thrombus launched The Chinese Expert Consensus on Multidisciplinary Diagnosis and Treatment of HCC with PVTT (version 2016) [8] based on the existing evidences published internationally and in China at that time. This version (version 2016) has been widely used and recognized clinically.

Over the past several years, many new evidences for the treatment of PVTT become available especially for the advent of new targeted drugs which have further improved the prognosis of PVTT. So, the Chinese Association of Liver Cancer revised the 2016 version of consensus to adapt to the development of PVTT treatment.

Based on internationally accepted practice, the grades of evidence we use are presented in Table 1 [9]. We also adopted the United States Preventive Service Task Force recommendations to assign 5 alphabets (A–D, I) to denote the strength of recommendation for clinical practice (Table 2) [10]. Child-Pugh score was used for liver function evaluation in this edition, and ALBI score would be considered in the future as more and more evidence has become available.

Table 1.

Grades of evidences

Grades of evidences
Grades of evidences
Table 2.

Ranking of recommended opinion

Ranking of recommended opinion
Ranking of recommended opinion

Diagnosis and Classification of PVTT

PVTT is one of the most common complications of HCC. A diagnosis of HCC is a prerequisite to diagnose PVTT [11]. The imaging features of PVTT include solid lesions within the portal vein in all the phases of intravenous enhanced 3-phase computed tomography, especially with enhancement of contrast in the arterial phase and washout in the portal venous phase of the procedure [12, 13]. Clinically, PVTT should be distinguished from portal vein thrombosis, which occurs as a complication of cirrhosis or after splenectomy. Portal vein thrombosis is not enhanced in the arterial phase. It occasionally disappears or improves after anticoagulant therapy [14].

The extent of PVTT is closely related to prognosis of HCC. The HCC staging systems that are commonly used today are the TNM staging, BCLC staging, and Japanese integrated staging systems. All these staging systems accept the importance of PVTT. However, they do not further define the extent of PVTT. At present, there are 2 classifications for PVTT: the Japanese VP classification [15] and the Cheng’s classification as suggested by Professor Cheng Shuqun of China [16-18].

The Cheng’s classification comprises 4 levels based on the extent of tumor thrombus in the portal vein shown on medical imaging: type I, tumor thrombus involving segmental or sectoral branches of the portal vein or above; type II, tumor thrombus involving the right/left portal vein; type III, tumor thrombus involving the main portal vein; and type IV, tumor thrombus involving the superior mesenteric vein. Type I0, tumor thrombus found only under microscopy. Many studies have supported that the Cheng’s classification to be more applicable than the VP classification for disease assessment, treatment selection, and prognostic judgment in patients with PVTT [17-19], and hence it is recommended to be used for classifying the extent of PVTT.

A multidisciplinary team to coordinate diagnosis and treatment of HCC patients with PVTT provides maximal benefits to patients. The therapeutic plan for the treatment of HCC with PVTT formulated by the National Research Cooperative Group for Diagnosis and Treatment of HCC with Tumor Thrombus is presented in Figure 1. Patients with Child-Pugh A liver function can undergo any treatment according to the PVTT type. When the lesion is resectable and when there is no extrahepatic metastasis, patients with type I/II PVTT should undergo surgical resection of the PVTT en bloc with the primary HCC. For patients with PVTT type III, the treatment choices include surgery, RT, and/or TACE depending on the patient’s preference. For unresectable lesions, patients with type I/II/III PVTT should receive RT combined with TACE as the primary treatment, and patients with type IV PVTT should receive RT or systemic therapy. Patients with Child-Pugh B liver function should first receive antiviral treatment for HCC secondary to hepatitis B or C infections. If the liver function improves to Child-Pugh A, then these patient subgroups can be treated as mentioned above. Surgery and TACE are not recommended for Child-Pugh B patients. Child-Pugh C patients should only receive supportive care. Child-Pugh A and Child-Pugh B patients who have extrahepatic metastases can receive systemic chemotherapy and/or local treatment. Sorafenib and Lenvatinib can be used for patients with all extents of PVTT with Child-Pugh A liver function. Regorafenib is the second-line treatment of sorafenib-resistant PVTT patients.

Fig. 1.

Diagnosis and treatment of HCC with PVTT. HCC, hepatocellular carcinoma; PVTT, portal vein tumor thrombus; RT, radiotherapy; TACE, transcatheter arterial chemoembolization.

Fig. 1.

Diagnosis and treatment of HCC with PVTT. HCC, hepatocellular carcinoma; PVTT, portal vein tumor thrombus; RT, radiotherapy; TACE, transcatheter arterial chemoembolization.

Close modal

Recommended First-Line Treatment Options for PVTT

The treatment of HCC patients with PVTT is based on the patients’ liver function, the stage of hepatic lesion, and the extent of PVTT. A strategy that can either eliminate or control HCC with PVTT using multimodality therapy can extend survival and improve quality of life of the patient.

Recommendations

Surgery is the preferred treatment in patients with Child-Pugh A, PVTT type I/II, and ECOG PS 0–1 (Evidence level IIb, Recommendation A); type III PVTT patients can undergo surgery directly or after tumor downstaging using RT and/or TACE (Evidence level IIb, Recommendation B).

Adjuvant TACE after surgery can be used to reduce recurrence (Evidence level Ib, Recommendation B).

Surgical treatment is considered to be potentially curative and is the preferred treatment option for HCC patients with type I/II PVTT. En bloc resection of the primary HCC and PVTT provides a potential for cure. Many studies reported that patients who had undergone surgery had better prognosis than those treated with TACE [11, 20, 21] or TACE combined with RT [22].

Type I/II PVTT are more suitable for resection than type III/IV (Evidence level IIb) [17, 23, 24]. En bloc resection can be performed in type I/II PVTT patients with partial hepatectomy or hemi-hepatectomy. For type III PVTT patients, as the PVTT has extended to the main portal vein, partial hepatectomy has to be combined with thrombectomy or main portal vein resection followed by reconstruction. At present, studies have revealed that there is no significant difference in prognosis among these surgical procedures (Evidence level IIb) [25]. Thrombectomy is by far the most commonly used surgical procedure.

The following are the recommendations for reducing recurrence rates and metastasis after surgery: (1) preoperative small-dose RT has been reported to downstage some type III PVTT patients, reduce recurrence rate without increasing surgical risks, and reduce postoperative hepatic failure rates (Evidence level IIa) [26]. (2) Adjuvant TACE after surgery has been reported to reduce recurrence rates and prolong survival of PVTT patients in a randomized controlled trial (from January 1996 to December 2004, including 126 patients) (Evidence level Ib) [27]; but a recent meta-analysis revealed that adjuvant TACE can only increase the 1-year survival rate. (3) Adjuvant hepatic artery infusion chemotherapy (HAIC) would be effective for recurrence prevention (IIb) [28].

Other treatment recommendations that are controversial include the following: (1) preoperative TACE has been reported to improve postoperative survival, but it may increase operative risks (Evidence level IIb) [29]. (2) There is a lack of high-level evidence for targeted therapy, adjuvant RT, or intravenous chemotherapy.

HAIC or TACE

Recommendations

  • Patients with nonresectable primary tumor, type I/II PVTT, and Child-Pugh A liver function may receive HAIC (Evidence level Ib, Recommendation B), TACE (Evidence level IIb, Recommendation B), alone or in combination with RT (Evidence level IIb, Recommendation A).

  • Patients with Child-Pugh B liver function or type III/IV PVTT are not recommended to receive TACE (Evidence level IIb, Recommendation C).

TACE is one of the most commonly used techniques to manage nonresectable HCC with PVTT [30]. Despite the possible benefit of TACE in prolonging overall survival (4–7 months) in patients with HCC and PVTT type III/IV, the use of TACE in patients is controversial due to the risk of liver infarction and hepatic failure [31]. At present, TACE is considered for PVTT patients with good liver function with adequate collateral circulation around the obstructed portal vein [32, 33]. The overall survival rate varies greatly among patients with PVTT after TACE. The patient survival rates decreased from 82% at 3 months to 71% at 6 months and 47% at 12 months, with a median survival of 10 months. Patients with Child-Pugh A liver function had better median survival when compared to patients with Child-Pugh B (15 vs. 13 months) [34], and the complete remission rate, partial remission rate, and stable disease rate were reported to be 0, 19.5–26.3, and 42.5–62.7%, respectively [35-37]. Lipiodol and gelatin sponge are common embolizing agents used in TACE [38]. Some reports have suggested that TACE, when combined with lipiodol, is more effective than TAI or conservative treatment [30, 39]. The effectiveness of the embolizing agents depends on their size. The smaller the diameter of an embolizing agent, the better is the effect on PVTT patients and the lower is its adverse side effects [40, 41]. The use of super-selective catheterization improves therapeutic effects and reduces damages to the normal liver when compared with conventional TACE. Recently, TACE with drug-eluting beads has been introduced into clinical application; however, its effects on HCC patients with PVTT are controversial [42].

HAIC was developed to treat metastatic liver tumors and was known to be more effective than conventional systemic chemotherapy. Recently, HAIC was then applied to advanced HCC [43]. A prospective randomized controlled study including 58 HCC patients with PVTT in Korea revealed that the median OS of HAIC group was 14.9 months, which was significantly higher than that of Sorafenib group (7.2 months, p = 0.012) [44].

External Beam Radiation Therapy

Recommendations

  • Patients with nonresectable HCC with all types of PVTT, with Child-Pugh A or B liver function, are recommended to receive RT with the target region containing both the primary tumors and PVTT – 3-dimensional conformal RT or intensify-modulated RT (IMRT) 95% plan target volume 40–60 Gy/2–3 Gy (Evidence level IIb, Recommendation B) or SBRT 36–40 Gy/5–6 Gy (Evidence level IIb, Recommendation A).

  • Patients with Child-Pugh A liver function and types I, II, and III PVTT are recommended to receive combined RT and TACE (Evidence level Ib, Recommendation A). The RT target region includes the primary tumor and PVTT or only the PVTT.

With development of newer technologies such as 3-dimensional conformal RT, IMRT, and 3-dimensional oriented RT (SBRT), radiation dosage to the targeted regions can be increased while giving better protection to the adjacent healthy tissues [45-47]. This allows the maximum use of RT technologies and enables their use in HCC patients with all types of PVTT.

The use of RT alone or in combination with other treatment such as TACE improved survival and quality of life in HCC patients with PVTT. Yoon et al. [48] conducted a prospective randomized controlled study including 90 HCC patients with PVTT and there were 45 cases in the TACE combined with RT group and 45 cases in the Sorafenib group. The results revealed that the median OS of TACE combined with RT group was 12.8 months, which was significantly higher than that of Sorafenib group (10.0 months, p = 0.04).

Target localization suggests the use of computed tomography and MRI image fusion technology based on the area of lipiodol deposition after TACE. The clinical target volume is 4 mm larger than the diameter of the tumor area [49]. The plan target volume should be determined on the basis of a moving target, set-up error, and random error. The designation of the irradiation area is still controversial, which should be determined individually. The hepatic lesion and PVTT should be irradiated simultaneously if the hepatic lesion is small and PVTT is nearby. If the volume of the primary tumor is large or PVTT is distant to the primary tumor, only the PVTT should receive irradiation [50].

There is not enough evidence to determine the best radiation and fraction doses. The existing evidence suggests a positive correlation between total radiation dose and tumor response [51]. However, multivariate analysis only showed response to RT to be associated with survival [51, 52]. Image-guided IMRT should be applied if available, which is better than conventional 3D-CRT [53].

Radiation-induced liver disease (RILD) or radiation hepatitis is a subacute form of liver injury, which occurs due to over exposure of the liver to radiation [54]. The key to prevent RILD is to keep the total dose within the tolerance range limit when designing the RT plan [54]. As most HCC patients in China have a cirrhotic background, the radiation tolerance dose of the liver in these patients is lower than that in patients from other countries. The liver tolerance dose (average dose of the liver) is 23 Gy for Child-Pugh A patients and only 6 Gy for Child-Pugh B patients [55]. The most common risk factors of RILD include preexisting poor liver function, high irradiation volume, coexisting PVT, and acute liver toxicity due to other causes [54, 55]. It is reported that individualized adaptive RT based on a direct biomarker of liver function such as ICG 15 can be used to achieve both high rates of local control and a high degree of safety without sacrificing either (Evidence level IIa) [56].

Evidence from clinical studies has shown a combination of RT and TACE produces better clinical outcomes than TACE or RT alone. The time interval between TACE and RT should not exceed 1 month [57]. When TACE is combined with RT, the order of the treatments given should be decided clinically. As the effect on liver function is less in patients receiving RT first than those receiving TACE first, with similar treatment outcomes, RT should be given before TACE [58].

Internal Radiation Therapy

Recommendations

  • Patients with nonresectable primary tumors; type I, II, and III PVTT; and Child-Pugh A liver function could be treated with transarterial arterial radio-embolization (TARE; Evidence level IIb, Recommendation C) or portal veins I125 seed implantation (Evidence level IIb, Recommendation B).

Patients treated with I125 particle seeds implanted in the portal vein and TACE have been reported to have better survival outcomes when compared to patients treated with TACE alone. This combination therapy also improved the reperfusion rate of portal vein significantly [59]. Another study showed I125 seeds followed by TACE significantly improved the median survival and progression-free survival rates when compared to I125 alone (p = 0.037 and 0.002, respectively) [60]. TARE with yttrium-90 (Y90) microspheres is considered to be a viable treatment option in HCC patients with PVTT. TARE has been shown to produce better long-term survival outcomes than TACE [61]. However, The SARAH trial revealed that the overall survival did not significantly differ between the Sorafenib group and TARE group for advanced HCC patients. [62]. Furthermore, there is no uniform dosage standard at present for internal radiation therapy.

Recommendations

  • Nucleoside analogs are recommended in patients with PVTT with positive HBV-DNA (Evidence level Ia, Recommendation A). Reactivation of HBV is of high importance in patients detected with negative HBV-DNA.

  • Sorafenib and Lenvatinib are recommended as the basic drug for PVTT patients with Child-Pugh A liver function (Evidence level Ib, Recommendation A). Regorafenib is recommended as the second-line treatment for PVTT patients with Child-Pugh A liver function (Evidence level Ib, Recommendation A).

  • Chemotherapy is recommended in PVTT patients (Evidence level IIb, Recommendation B) with extrahepatic metastasis and Child-Pugh A liver function.

Persistent HBV infection is an important poor risk factor for occurrence, progression, recurrence, and death in patients with HCC secondary to HBV infection. Antiviral therapy reduces postoperative recurrence and improves survival of HCC patients [63]. Antiviral therapy should also be given to PVTT patients [64, 65].

Sorafenib and Lenvatinib are universally accepted therapy that effectively prolongs survival in patients with advanced HCC (Evidence level Ib) [66, 67]. Both have been listed by the China Food and Drug Administration as the first-line treatment option in patients with advanced HCC. The STORM was a phase 3, double-blind, randomized, placebo-controlled study, which evaluated the effectiveness of sorafenib as adjuvant therapy to surgery. When compared to placebo, sorafenib did not show any significant improvement in the median recurrence-free survival (33.3 vs. 33.7 months, p = 0.26), suggesting that adjuvant sorafenib to be ineffective [68]. The effectiveness of Sorafenib and TACE combination has also been controversial [69-71]. Regorafenib is recommended as the second-line treatment for PVTT patients (Evidence level Ib) [72].

The EACH study demonstrated that FOLFOX 4 (an oxaliplatin-containing chemotherapy) provided partial cure in patients with advanced HCC (including PVTT patients). FOLFOX 4 might be administered in patients with good liver function and tolerance (Evidence level Ib) [73]. A phased II prospective study revealed that mFOLFOX4 combined with Sorafenib would be more effective, but the results need further validation [74].

Recommendations

  • Local ablation therapies should be recommended in PVTT patients with caution; further studies are warranted (Evidence level III, Recommendation C). Local ablation therapies may be combined with TACE (Evidence level IIb, Recommendation B).

The local ablation therapies include percutaneous ethanol injection, radiofrequency ablation, and laser ablation. These therapies may be adopted to reduce tumor load and recanalization of portal vein. However, local therapies must be used cautiously as there is a risk of damaging the portal vein wall and bile duct. In addition, a high recurrence rate of PVTT has been reported within a short period of time (Level III evidence) [75, 76].

Recommendations

  • Symptomatic and supportive treatment is recommended in patients with Child-Pugh C liver function, with massive ascites or gastrointestinal bleeding due to esophageal varices and hepatic encephalopathy (Evidence level Ia, Recommendation A).

Portal vein stenting may be adopted to recanalize blood flow in the portal veins of PVTT patients, with resultant increase in blood flow to the liver, but without reducing the tumor load. In patients with PVTT, portal vein stenting can result in improved liver functions, reduced portal vein pressure, and at the same time, win time for other therapies such as RT and TACE to act (Evidence level III) [77].

Most complications of PVTT result from portal hypertension. The common complications include upper gastrointestinal hemorrhage, ascites, hypersplenism, hepatorenal syndrome, and hepatic failure. For therapeutic methods, please refer to the article on treatment of portal hypertension [78]. In addition, Chinese medicine such as Huaier granule [79] could also be used for PVTT patients with nonresectable primary tumors.

It is necessary to develop a treatment consensus in China as HCC patients with PVTT in China are different from those in Europe and America in terms of etiology and biological behavior. Although treatment of HCC patients with PVTT is still controversial, new evidences are being gathered. Similar to the multidisciplinary approach of HCC treatment in the United States (the American Association for the Study of Liver Diseases practice guidelines) and Europe (the European Association for the Study of the Liver – European Organization for Research and Treatment of Cancer) for HCC management, we have adopted a multidisciplinary approach for HCC with PVTT. This treatment approach when combined with early diagnosis will enable a larger number of patients to receive an appropriate treatment based on the stage of the disease.

In our consensus meetings, the following principles in clinical practice are emphasized: (1) Multidisciplinary treatment should be used in HCC patients with PVTT to achieve better results. (2) Prolongation of overall survival is the most important target, and the chance of cure is low. Emphasis should also be given to the quality of life of these patients. The treatment complication rate should be kept at a minimum. (3) Local treatment should be combined with systemic treatment to provide better long-term survival for these patients.

More RCTs should be conducted in HCC patients with PVTT. The molecular mechanisms underlying the genesis and development of PVTT also need to be studied to lay the foundation of more future effective treatment. The role of Chinese traditional medicine in the treatment of PVTT as an adjuvant to other therapeutic options such as surgical treatment, TACE, or RT should be evaluated.

The authors would like to acknowledge Prof. Lau Wan Yee for providing writing support and technical assistance in developing the English version of this consensus. Also we acknowledge the Consensus Revision Committee.

Committee members: Wei Ding, Xiao Hui Yu, Chi Dan Wan, Zhi Ming Wang, Jian Wang, Kui Wang, Lu Wang, Zhen Xia Wang, Yao Dong Wang, Yi Lei Mao, Tian Fu Wen, Chi Hua Fang, Tao Yin, Xue Tao Shi, Jie Shi, Shi Chun Lu, Qi Ping Lu, Sheng Long Ye, Li Guo Tian, Lin Hu Tong, Wen Ming Cong, Ming Kuang, Xin Yu Bi, Bin Liu, Ji Ye Zhu, Yu Zhu, Tian QI Liu, Yong Xiong Liu, Lian Xin Liu, Yan Yan Liu, Jian Hua Liu, Ying Bin Liu, Zhao Hui Tang, Jun Hui Sun, Bei Cheng Sun, Hui Chuan Sun, Yi Ping Mou, Jiang Tao Li, Qi Yong Li, Jun Li, Bo Li, Xiang Cheng Li, Ai Jun Li, Jing Li, Bin Li, Ding Hua Yang, Zhen Yu Xiao, Li Qun Wu, Zheng Ping Yu, Min Gang Ying, Feng Shen, Tian Qiang Song, Zhi Wei Zhang, Xue Wen Zhang, Jian Jun Zhang, Shao Geng Zhang, Min Zhang, Ti Zhang, Qi Zhang, Cai De Lu, Wei Chen, Min Chen, Xin Shi Chen, Rui Fang Fan, Lin Lin, Dong Zhou, Cun Cai Zhou, Jie Zhou, Jian Zhou, Dong Hai Zheng, Ya Xin Zheng, Yan Meng, Ming Zhao, Wei Dong Jia, Yi Ren Hu, De Fei Hong, Lin Zhong, Ning Yang Jia, Yi Jun Xia, Jing Lin Xia, Li Xu, Xiao Yu Yin, Wei Xing Guo, Rong Ping Guo, Yu Fu Tang, Yang Qing Huang, Li Ping Cao, Wei Gong, Li Jian Liang, He Ping Peng, Bao Gang Peng, Shu You Peng, Xu Ting Zhi, Zhang Jun Cheng, Xian Bo Fu, Zhi Xiang Jian, Yang Cai, Jian Zhai, Le Qun Li, Gao Jun Teng, Zhi Ping Yan, Zuo Jun Zhen, Chao Liu Dai. Secretariats: Ju Xian Sun, Rong Ping Guo, Xin Yu Bi.

Our manuscript complies with the guidelines for human studies and was conducted ethically in accordance with the World Medical Association Declaration of Helsinki. In the manuscript, all authors state that subjects have given their written informed consent and that the study protocol was approved by the institute’s committee on human research.

The authors have no conflicts of interest to declare.

None.

All the authors planned the study and contributed to the interpretation of the data, revisions, and gave input at all stages of the study. All the authors have approved the final version of the manuscript.

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