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Oncological management of primary liver cancer 189
response rate and tumor control, but a benefit on overall survival has not been clearly demonstrated [75]. The combination of infusional 5-fluorouracil, leucovorin, and oxaliplatin (FOLFOX) was recently evaluated in Asian patients with HCC in a randomized trial compared with doxorubicin [76]. At the time of final analysis, there was a nonsignificant trend towards improved overall survival in patients treated with FOLFOX com­pared with doxorubicin (6.4 versus 4.97 months, P = 0.07). A post hoc analysis with longer follow-up later found that the overall survival advantage with FOLFOX was maintained. For patients with advanced HCC who experience progressive disease on sorafenib or who are intolerant of sorafenib, this study suggests that FOLFOX may provide modest benefit.
stage HCC. Because HCCs are vascular tumors with increased expression of VEGF and microvessel density, inhibition of angiogenesis has been investigated as a poten­tial therapeutic strategy [77]. Two randomized studies have demonstrated improved overall survival in patients with advanced HCC treated with sorafenib (Table 12.1). In the phase III Sorafenib HCC Assessment Randomized Protocol (SHARP) trial, 602 patients with ECOG PS 0–2andChild– Pugh class A liver function were randomized to receive sorafenib or a placebo [48]. Although the number of com­plete (0%) and partial responses (2%) to treatment was low, sorafenib was associated with improved overall sur­vival (median OS, 10.7 months versus 7.9 months, P < 0.001). Furthermore, sorafenib was also associated with a delay in TTP. Similar results were seen in the phase III Asian-Pacific study of sorafenib versus placebo [78].
12.2.3.2 Molecularly targeted therapy
Until recently, no systemic therapies had been associated with improved overall survival in patients with advanced-
Table 12.1 Results of selected randomized phase III clinical trials of molecularly targeted therapies for advanced HCC.
Agent Molecular target Line of
therapy
Sorafenib versus placebo [48] VEGFR, PDGFR, 1
FLT-3, RAF (0.45–0.74) 0.69 (0.55–0.87)
Sorafenib versus placebo [78] VEGFR, PDGFR, 1
FLT-3, RAF (0.42–0.79) 0.68 (0.50–0.93)
st
st
Other receptor tyrosine kinase inhibitors have been eval­uatedinpatientswithadvancedHCCandcompareddirectly against sorafenib (see Table 12.1). However, neither
ORR (%) TTP (months) Median OS
(months)
2 versus 1 5.5 versus 2.8; HR 0.58 10.7 versus 7.9; HR
3.3 versus 1.3 2.8 versus 1.4; HR 0.57 6.5 versus 4.2; HR
Brivanib versus placebo [138] VEGFR, FGFR 2
Ramucirumab versus VEGFR-2 2 placebo [83] 0.63 (0.52–0.75) 0.87 (0.72-1.05) Brivanib versus sorafenib [80] VEGFR, FGFR 1
Sunitinib versus sorafenib [79] VEGFR, PDGFRα/β, 1
c-kit, FLT3, RET (0.96–1.31) 1.3 (1.13–1.50)
Linifanib versus sorafenib [81] VEGFR, PDGFR 1
Erlotinib + sorafenib versus EGFR 1 placebo + sorafenib [82] 1.14 (0.94–1.37) 0.93 (0.78–1.11)
Everolimus versus placebo [84] mTOR 2
EGFR, epidermal growth factor receptor; FGFR, fibroblast growth factor receptor; FLT-3, FMS-related tyrosine kinase 3; HR, hazard ratio; mTOR, mammalian target of rapamycin; ORR, overall response rate (complete response or partial response as measured by Response Evaluation Criteria in Solid Tumors [RECIST] or modified RECIST for HCC); OS, overall survival; PDGFR, platelet-derived growth factor receptor; PFS, progression­free survival; RAF, Raf kinases; RET, glial cell line-derived neurotropic factor receptor (REarranged during Transfection); VEGFR, vascular endothelial growth factor receptor.
nd
nd
st
st
st
st
nd
10 versus 2 4.2 versus 2.7; HR 0.56 9.4 versus 8.2; HR
(0.42–0.75) 0.89 (0.69–1.15)
7 versus 1 PFS: 2.8 versus 2.1; HR 9.2 versus 7.6; HR
12 versus 9 4.2 versus 4.1; HR 1.01 9.5 versus 9.9; HR
(0.88–1.16) 1.06 (0.93–1.22)
6.6 versus 6.1 4.1 versus 3.8, HR 1.13 7.9 versus 10.2; HR
13.0 versus 6.9 5.4 versus 4.0; HR 0.76 9.1 versus 9.8; HR
(0.64–0.90) 1.05 (0.90–1.22)
3.2 versus 4.0 mo; HR 9.5 versus 8.5; HR
2.2 versus 1.6 3.0 versus 2.6; HR 0.93 7.6 versus 7.3; HR
(0.75–1.15) 1.05 (0.86–1.27)
190 Chapter 12
sunitinib, brivanib, linifanibnor the combination of sorafenib plus erlotinib have demonstrated superiority or noninferior­ity to sorafenib [79–82]. Additionally, no significant survival advantage was observed in phase III trials of ramucirumab, a monoclonal antibody that blocks activation of VEGFR-2, or everolimus, an inhibitor of the mammalian target of rapa­mycin(mTOR), versus placeboand in patientswith advanced HCC following first-line therapy with sorafenib [83,84].
KEY POINTS: HEPATOCELLULAR CARCINOMA
• Hepatocellular carcinoma arises in the setting of chronic liver disease and cirrhosis in over 80% of patients. This can adversely affect overall survival, limit surgical options, and affect tolerance to systemic therapy.
• For patients with early-stage HCC, potentially curative treatment options exist.
– For patients without advanced cirrhosis, surgical resection is the preferred management. – For patients with cirrhosis who are not candidates for resection, liver transplantation can be considered for patients
meeting transplant criteria.
– For patients with small HCCs who are poor surgical candidates because of impaired liver function or other serious medical
comorbidities, local ablative therapy can be considered.
– Neoadjuvant and adjuvant therapies have no proven bene fit and remain under investigation.
• For patients with intermediate-stage HCC, preserved liver function, and large or multifocal tumors without main portal vein
occlusion or extrahepatic metastases, hepatic artery embolization or radiation therapy can be considered.
• Cytotoxic chemotherapy has limited efficacy against HCC. Sorafenib has demonstrated an overall survival benefit for patients with advanced HCC. Other molecularly targeted agents remain under investigation.
Other agents targeting different molecular pathways involved in hepatocarcinogenesis, including hepatocyte growth factor/c-MET (tivantinib, cabozantinib) and other inhibitors of angiogenesis, remain under investigation [85,86]. Furthermore, early promising results have been demonstrated with the immune checkpoint inhibitor nivo­lumab, a monoclonal antibody that blocks the programmed cell death 1 (PD-1) receptor on activated T cells [87].
12.3 Biliary tract cancers
Biliary tract cancers represent a heterogeneous group of malignancies that include cholangiocarcinoma and gallbladder carcinoma. Cholangiocarcinomas, primarily adenocarcinoma, arise from the epithelium of the bile ducts and are classified according to location as intrahepatic and extrahepatic cholangiocarcinoma (Figure 12.2). Extrahe­patic tumors can be further subclassified into hilar carcino­mas, arising at or near the junction of the left and right hepatic ducts, and distal cholangiocarcinoma. Approxi­mately 60–70% of biliary tract cancers arise in the perihilar region (Klatskin tumors). Extrahepatic and intrahepatic cholangiocarcinomas occur in approximately 20–30% and 5–10% of patients, respectively [88]. Because most biliary tract cancers present at an advanced stage, these cancers are associated with a poor prognosis with five-year survival rates less than 5–10% [89].
12.3.1 Resected, localized biliary tract cancers: role of adjuvant therapy
Surgical resection represents the only potentially curative treatment modality, but it is estimated that less than 35%
of patients are candidates for resection owing to extent of local disease or presence of metastatic disease [90,91]. The five-year survival rates for patients with resected biliary tract cancers are in the range of 30–50% [92]. Outcomes vary depending on location and stage of the primary lesion. Distal cholangiocarcinomas have a more favorable prognosis compared with perihilar
Figure 12.2 Anatomical classification of biliary tract cancers.
Source: Turaga [149]. Reproduced with permission of Springer.
Oncological management of primary liver cancer 191
cholangiocarcinoma [93]. Gallbladder carcinoma, in gen­eral, is the most aggressive of the biliary tract cancers and is associated with the shortest median survival [94].
Multiple studies have demonstrated that the presence of lymph node metastases in patients with cholangiocarci­noma is a poor prognostic factor [93,95–97]. Furthermore, studies including patients with perihilar carcinoma and distal cholangiocarcinoma have demonstrated survival dif­ferences related to total lymph node count among those with pathologically node-negative disease [96,97]. This observation has raised the possibility of a therapeutic benefit for lymphadenectomy, but more likely reflects the effects of accurate staging of disease. While lymph node dissection itself may have little direct impact on survival, staging information may influence decisions regarding postsurgical treatment that potentially could affect outcome. Although regional lymphadenectomy is performed routinely for car­cinomas arising from extrahepatic bile ducts, indications for lymph node dissection for intrahepatic cholangiocarcinoma remain controversial [27,98]. Nonetheless, because lymph node involvement is such an important prognostic factor, lymphadenectomy should be considered to obtain a precise stage of disease and to provide prognostic information that could influence postoperative management.
Local recurrence in the liver is the most common pattern for relapse following resection of biliary tract cancers although there is a suggestion that gallbladder cancer may also be associated with greater risk of distant metastatic spread [90,94]. Because of the high rate of recurrence, adjuvant chemotherapy and radiation have been investigated as potential strategies to improve out­come. However, most of the studies investigating the efficacy and tolerance of adjuvant therapy in this patient population have been retrospective in nature and based on small numbers of patients that include both gallbladder and bile duct cancers arising from various locations. Thus, the role of adjuvant therapy for resected biliary tract cancers remains a controversial topic, and its benefits have not been well defined.
12.3.1.1 Adjuvant chemotherapy
Although retrospective studies have suggested an advan­tage with adjuvant chemotherapy alone, randomized studies have not demonstrated that chemotherapy can improve survival following resection of cholangiocarci­noma. A multicenter randomized trial conducted in Japan compared postoperative chemotherapy with mitomycin C and 5-FU versus surgery alone in patients with resected pancreaticobiliary malignancies. Among patients with
resected cholangiocarcinoma, five-year OS in patients receiving chemotherapy (27%) was not significantly dif­ferent to those undergoing surgery alone (24%) [99]. Furthermore, the European ESAPC-3 study randomized patients with resected periampullary malignancies to receiveadjuvant 5-FU with leucovorin versusgemcitabine versus observation following surgery. Amongthe subsetof patients with bile duct cancer, there was no improvement in median survival associated with receipt of chemo­therapy. The median survival rates of patients receiving no chemotherapy, 5-FU/leucovorin, and gemcitabine were 27, 18, and 20 months, respectively [100].
12.3.1.2 Adjuvant radiation therapy
Data have been mixed regarding the benefits of adjuvant radiation therapy following complete resection of biliary tract cancers. Some retrospective studies have demon­strated improved local control and survival among patients with undergoing intraoperative and post­operative radiation therapy [101–103]. However, con­trasting studies also suggest no improvement in outcome and significant side-effects [104 – 106]. One subgroup of patients who may benefit from postoperative radiation is those with positive resection margins. In a retrospective study of patients undergoing curative-intent surgery for extrahepatic cholangiocarcinoma, those with microscop­ically positive resection margins who received adjuvant radiation therapy had higher median disease-free sur­vival rates than those who underwent surgery alone (21 months versus 10 months, respectively, P = 0.042) [107].
12.3.1.3 Adjuvant chemoradiation therapy
Several retrospective and phase II studies have suggested benefit for postoperative chemoradiation therapy in patients with completely or incompletely resected biliary tract cancers. In a retrospective analysis of patients with resected extrahepatic cholangiocarcinoma, similar sur­vival was observed between patients with standard risk disease (R0 resection, node-negative disease) and those with high-risk disease (R1 resection, node-positive dis­ease) who receivedadjuvantchemoradiation.The lack of a survival difference between the two groups suggests that patients at high risk for locoregional recurrence may benefit from adjuvant chemoradiation following sur­gery [108]. Similarly, in another retrospective study of patients with extrahepatic cholangiocarcioma undergoing curative-intent resection, receipt of adjuvant chemoradia­tion therapy was associated with improved overall sur­vival, disease-free survival, and locoregional control
192 Chapter 12
compared with surgical resection alone after controlling for other prognostic factors [109]. A recent phase II study provides prospective data regarding the benefitofadju­vant chemotherapy (capecitabine plus gemcitabine) fol­lowed by 5-FU-based chemoradiation after resection of extrahepatic cholangiocarcinoma and gallbladder cancer. Promising results were demonstrated: two-year OS, DFS, and local recurrence rates were 65%, 52%, and 11% respectively, among all 79 patients treated (54 with chol­angiocarcinoma, 25 with gallbladder cancer) [110].
Among more recent retrospective studies that include only patients with gallbladder carcinoma, adjuvant che­moradiation therapy following resection has been associ­ated with improved survival after adjusting for other predictors of survival [111,112]. Similarly, a model based on treatment and outcome of patients with resected gallbladder carcinoma included in the United States National Cancer Institute SEER-Medicare database dem­onstrated the greatest benefit for adjuvant chemoradia­tion therapy among patients with node-positive disease or with tumors staged as T2 or higher [113].
A recent meta-analysis has further examined the role of adjuvant therapy in the treatment of biliary tract can­cers [114]. The analysis was composed of trials of adjuvant therapy for patients undergoing adjuvant chemotherapy, radiotherapy, or both after curative-intent surgery for gallbladder and bile duct cancers and included patients who underwent surgery alone as a comparator group. In the pooled data, there was a nonsignificant improvement in OS with any adjuvant therapy compared with surgery alone (odds ratio [OR] 0.74; 95% confidence interval [CI]
0.55–1.10;P = 0.06). A nonsignificant survival benefitwas also observed when patients with gallbladder and bile duct carcinomaswere analyzed independently. Those receiving chemotherapy (OR 0.39; 95% CI 0.23–0.66; P < 0.001) or chemoradiation therapy (OR 0.61; 95% CI 0.38–0.99; P = 0.049) appeared to derive greater benefit than those treated with radiation alone (OR 0.98; 95% CI 0.67–1.43; P = 0.90). The greatest benefit was observed for adjuvant therapy in patients with high-risk lymph node-positive disease and those with incomplete R1 resections. These data suggest that adjuvant chemotherapy or chemoradia­tion therapy may improve outcome in patients with resected, high-risk gallbladder and bile duct cancers and provide support for a common practice of administering adjuvant therapy. However, prospective, randomized tri­als are necessary to further evaluate the benefit of post­operative therapy.
12.3.2 Locally advanced and metastatic biliary tract cancers
12.3.2.1 Radiation and chemoradiation therapy
The majority of patients with cholangiocarcinoma present with locally unresectable disease. There is limited experi­ence with neoadjuvant therapy as a surgical conversion strategy in the management of patients with initially unre­sectable, locally advanced disease. However, reports have suggested a potential role for selected patients. In a retro­spective report of 45 patients with resected extrahepatic cholangiocarcinoma, 12 patients were treated with neo­adjuvant therapy. Of these 12 patients, 10 had disease deemed initially unresectable and two had potentially resectable disease but received neoadjuvant chemoradia­tion therapy owing to physician preference. Supporting the concept that neoadjuvant therapy can improve the ability to resect initially unresectable disease, three of the 12 patients who received neoadjuvant chemoradiation therapy had a complete pathological response to treatment, and 11 of the 12 patients underwent an R0 resection [115]. Additionally, in a series of patients with extrahepatic cholangiocarci­noma, three of nine patients who were treated with pre­operative chemoradiation therapy had a pathological complete response to therapy. Furthermore, all nine patients who received chemoradiation therapy had nega­tive margins at resection, compared with only half who did not receive neoadjuvant therapy [116]. Although these results are promising, particularly for patients with initially unresectable disease, additional prospective studies are needed to clarify the benefits of neoadjuvant therapy.
Although data are limited, radiation may also pro­vide local control of disease for patients with unresect­able, locally advanced disease. In a retrospective study of patients with locally advanced extrahepatic chol­angiocarcinoma who were treated with external beam radiation thera py with concurrent chemotherapy and/ or brachytherapy, overall survival and local control rates at one year were 59% and 90%, respectively. At the time of death, the majority of patients had local control of disease, suggesting that local effects of tumor might be effectively controlled with r adiation ther­apy [117]. A more recent p hase II study demonstrated high l ocal control rates with high-dose hypofractio­nated proton beam radiation therapy for locally advanced, unresectable HCC and intrahepatic cholan­giocarcinoma, supporting further investigation into the role of radiation therapy for unresectable primary liver cancers [64].
Oncological management of primary liver cancer 193
12.3.2.2 Hepatic artery-based therapy
Much of the data supporting the role of hepatic artery-based therapy for primary liver cancers is derived from series also including patients with HCC. Recent studies, however, have examined the efficacy of hepatic artery embolization, par­ticularly radioembolization, for localized, unresectable intra­hepatic cholangiocarcinoma [118–122]. In a multi­institutional series including 198 patients with intrahepatic cholangiocarcinoma treated with chemoembolization, bland embolization or yttrium-90 radioembolization, com­plete or partial radiographic responses were reported in 26% of patients, while 62% had stable disease [123]. Median OS was 13.2 months and did not vary according to type of embolization technique. Randomized studies comparing the various hepatic artery-based therapies to radiation or chemotherapy are not yet available.
12.3.2.3 Chemotherapy
Systemic chemotherapy remains a cornerstone in the palliative management of patients with unresectable and metastatic biliary tract cancers. The combination of 5-FU, leucovorin, and etoposide has demonstrated an overall survival benefit compared with best supportive
care in a randomized study of patients with advanced biliary tract and pancreatic cancers (median OS, six months versus 2.5 months) [124]. Furthermore, quality of life measures improved more and deteriorated less often in the patients receiving chemotherapy. Multiple phase II studies have also demonstrated activity of chemotherapy in the treatment of this disease. In a pooled analysis of 104 trials including 2810 patients with advanced biliary tract cancer, superior tumor response and control rates were observed in patients receiving chemotherapy regimens containing gemcitabine and platinum [125].
The combination of gemcitabine and cisplatin has been showntoimproveoverallsurvivalinpatientswithadvanced biliary tract cancers. In the UK ABC-02 trial, patients with advanced biliary tract cancers were randomized to receive gemcitabine and cisplatin or gemcitabine alone. OS was significantly improved in patients receiving combination therapy compared with single-agent gemcitabine (11.7 months versus 8.1 months, P < 0.001) [126]. The rate of tumor control, as defined by complete or partial responses and stable disease, was also higher in patients receiving gemcitabine and cisplatin (81.4% versus 71.8%, P = 0.049). Similarly, a randomized phase II study reported
Table 12.2 Results of selected clinical trials of molecularly targeted therapies for advanced biliary tract cancers.
Agent/target Trial phase Line of
therapy
EGFR
Erlotinib [139] Gemcitabine + oxaliplatin +/erlotinib [140]
Gemcitabine + oxaliplatin +/cetuximab [141] Gemcitabine + oxaliplatin + capecitabine + panitumumuab [142]
VEGF
Gemcitabine + oxaliplatin + bevacizumab [143] Sorafenib [144] Sorafenib [145] Sunitinib [146]
HER2
Lapatinib [147] II 1
MEK
Selumetinib [148] II 2
EGFR, epidermal growth factor receptor; HER2, human epidermal growth factor receptor 2; HR, hazard ratio; MEK, mitogen-activated protein kinase; ORR, overall response rate; OS, overall survival; PFS, progression-free survival; VEGF, vascular endothelial growth factor.
II III (randomized)
II (randomized) II
II II II II
1 1
1 1
1 Any 1 2
st/2nd
st
st
st
st
st
nd
st/2nd
nd
ORR (%) Median PFS
(months)
8 30 versus 16 (P = 0.005) 24 versus 23 33
40 2 0
8.9
0 1.8 5.2
12 3.7 9.8
2.6
5.8 versus 4.2; HR
0.80 (0.61–1.03)
6.1 versus 5.5
8.3
7.0
2.3 3
1.7
Median OS (months)
7.5
9.5 versus 9.5; HR
0.93 (0.69–1.25)
11.0 versus 12.4
9.8
12.7
4.4 9
4.8
194 Chapter 12
by Okusaka et al. also showed improved outcome for patients with advanced biliary tract cancers treated with the combi­nation of gemcitabine and cisplatin compared with gemci­tabine alone [127]. Although gemcitabine plus cisplatin has been shown to be superior to gemcitabine alone, this com­bination has not been compared with other chemotherapy combinations. Other regimens that have demonstrated activity in advanced biliary tract cancers in phase II trials have included gemcitabine and oxaliplatin [128–130], gem­citabine and fluoropyrimidine [131–133], and fluoropyri­midine and oxaliplatin [134].
Although chemotherapy has improved outcomes for
patients with advanced biliary tract cancers, prognosis for
KEY POINTS: BILIARY TRACT CANCERS
• Biliary tract cancers are a heterogeneous group of tumors composed of gallbladder carcinoma, intrahepatic, perihilar, and distal cholangiocarcinoma. Most patients present at an advanced stage with unresectable disease.
• Surgical resection remains the only curative treatment modality.
• The role of adjuvant therapyfor completelyresected biliary tract cancersis controversial, and benefits have not been well defined.
– In R0 resected patients, external beam radiation has not shown survival benefit. However, adjuvant radiation may benefit
patients with positive resection margins.
– Adjuvant chemoradiation therapy may have benefit for patients with high-risk disease (lymph node and/or margin positive).
• There are limited data about the role of chemoradiation therapy for patients with locally advanced disease. In selected patients, it
may improve ability to resect initially unresectable tumors and improve local control. Radiation may also provide local control of disease for patients with unresectable, locally advanced disease.
• Hepatic artery-based therapies are a promising strategy for patients with unresectable locally intrahepatic cholangiocarcinoma and warrant prospective evaluation in comparison to other standards of care.
• Systemic chemotherapy with gemcitabine and cisplatin improves overall survival for patients with advanced biliary tract cancer. Other combination chemotherapy regimens are active in the treatment of patients with metastatic disease.
patients remains poor. Targeted therapies directed against signaling pathways in biliary tract cancers, including the epidermal growth factor receptor (EGFR), angiogenesis, and the mitogen-activated protein kinase (MEK) pathway, have been investigated with early promising results (Table 12.2). Recent studies have also identified genomic alterations in cholangiocarcinoma and gallbladder cancer involving chro­matin remodeling genes and the IDH1 and IDH2 genes that encode metabolic enzymes [135]. Furthermore, alterations in fibroblast growth factor receptor 2 (FGF2), including novel gene fusions, have been identified [136,137]. These findings have the potential to translate into new targets and improve­ments in therapy for patients with advanced disease.
12.4 Conclusion
Although the management of patients with primary liver cancers remains challenging because of underlying liver dysfunction, complex molecular biology, and heteroge­neity of disease, recent progress in surgical and medical therapy has improved the prognosis of patients with both early and advanced disease. Future advances, including those involving minimally invasive surgery, interven­tional radiology, and radiation techniques, have the potential to further improve outcomes for patients with early and intermediate-stage disease. Systemic chemo­therapy can improve survival of patients with advanced disease, and hopefully the identification of novel molec­ular targets and predictors of response will translate into
new therapeutic strategies. A multidisciplinary approach is essential to optimizing patient outcome.
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