Polymyositis (PM) is an inflammatory condition of skeletal muscle and is believed to be a paraneoplastic syndrome associated with various types of cancer. PM associated with chronic hepatitis B virus (HBV)-related hepatocellular carcinoma (HCC) is very rare. We report a case of advanced HCC with chronic HBV cirrhosis that presented with proximal muscle weakness. Further investigation showed elevation of muscle enzymes, myopathic pattern of electromyography (EMG), and evidence of myositis compatible with PM. Lamivudine and 1 mg/kg of oral prednisolone were given. Two sessions of transcatheter arterial chemoembolization (TACE) were performed and sorafenib was started. Muscle enzymes normalized after 6 weeks of treatment. Unfortunately, 5 months after treatment, patient was readmitted and died of severe bacterial pneumonia.
Polymyositis (PM) is an idiopathic inflammatory myopathy. It is a systemic disease that affects skeletal muscles and results in proximal muscle weakness. PM is associated with malignancy in 10–15% of patients.1–3 The 3 most commonly associated cancers are nasopharyngeal, lung, and breast cancer.4 Hepatocellular carcinoma (HCC)-associated PM is quite rare. We report a case of hepatitis B virus (HBV) cirrhosis with advanced HCC presenting with PM.
A previously healthy 56-year-old male presented with a 6-week history of fever. Two weeks prior to admission, he developed progressive proximal muscle weakness. Through work-up, he was diagnosed with chronic HBV cirrhosis (Child-Pugh B; MELD 7) with advanced HCC. On physical examination, body temperature was 38°C, blood pressure was 120/75, and pulse rate was 92 bpm. Examination of the limbs showed normal tone without muscle wasting or tenderness. There was bilateral proximal weakness in both upper and lower limbs, with grade 3 of 5 in strength of both flexion and extension based on the Medical Research Council scale (MRC), with normal strength in distal limbs. His neck muscles were also weak. Deep tendon reflexes and sensation were normal. He had hepatomegaly and signs of chronic liver stigmata, but no ascites and no signs of hepatic encephalopathy. His Eastern Cooperative Oncology Group (ECOG) performance status score was 2.
Laboratory revealed albumin 2.2 g/dL, total protein 4.4 g/dL, aspartate aminotransferase (AST) 724 IU/L, alanine aminotransferase (ALT) 236 IU/L, total bilirubin 1.0 mg/dL, alkaline phosphatase 148 U/L, prothrombin time (PT) 14.1 s, international normalized ratio (INR) 1.14, and creatinine 0.8 mg/dL. His creatinine phosphokinase was 17,963 IU/L. Serum electrolytes and thyroid function tests were normal. His viral profiles were positive for HBV with DNA polymerase chain reaction (PCR) of 17,460 IU/mL. Tests for hepatitis C virus and HIV were negative. Alpha-fetoprotein (AFP) was 56,310 ng/mL (normal: <25 ng/mL). Autoantibodies including anti-dsDNA, anti-Jo-1, anti-neutrophilic cytoplasmic antibody, anti-RNP, anti-SSA, and anti-SSB were negative.
Abdominal computed tomography (CT) showed liver cirrhosis with an ill-defined 12 x 7-cm, arterial-enhancing, heterogeneous, hypodense lesion in the left lobe of the liver with increased enhancement on venous and delay phase and central necrosis. The CT showed 2 additional arterial-enhancing lesions, size 6 x 7 cm and 3 x 3 cm, with contrast washout in the venous phase at hepatic segments V/VIII and VII and a left main portal vein thrombosis (Figure 1). Liver biopsy of the largest lesion was performed to exclude secondary liver neoplasm. Histology showed poorly differentiated carcinoma positive for glypican 3 (GPC3) and negative for CK7, CK20, and hepatocyte paraffin 1 (Figure 2), which was consistent with the diagnosis of HCC.
Figure 1. (A) Contrast-enhanced abdominal CT showing liver cirrhosis, an ill-defined, arterial-enhancing heterogeneous isodense to hypodense lesion (arrow), and (B) increased enhancement in the left lobe of the liver on venous phase with central necrosis (arrow) and left main portal vein thrombosis (asterisk).
Figure 2. Histological examination of liver mass with haematoxylin and eosin (H&E) stain showing poorly differentiated carcinoma (arrows).
Electromyography (EMG) showed low-amplitude, short-duration action potentials with an early recruitment pattern, normal nerve conduction study, and repetitive nerve stimulation. These findings were highly suggestive of a myopathic pattern (Figure 3). Muscle biopsy showed increased endomysial connective tissue and lymphocyte infiltration with necrotic and regenerating myofibers (Figure 4). No vasculitis or perifascicular pattern was seen, and a diagnosis was polymyositis (PM) was confirmed. Prednisolone 1 mg/kg for PM treatment and lamivudine for preventing hepatitis B reactivation were given. Two sessions of transcatheter arterial chemoembolization (TACE) were performed. His creatinine kinase level decreased to normal after 6 weeks of treatment, but his muscle strength did not improve. Unfortunately, 5 months after treatment, he was readmitted with severe bacterial pneumonia and died after 16 days of hospitalization.
HCC-associated PM is a rare condition. Only 4 cases of PM associated with HCC have been reported (Table 1).5–8 A previous study showed that large tumor size and a high AFP level were commonly found in HCC patients who had paraneoplastic syndromes.9 Our patient had both a large tumor and a very high AFP level. The pathogenesis of PM has not been identified. A possible mechanism is that an autoimmune process triggered by the tumor leads to clonally expanded CD8-positive cytotoxic T-cells that invade muscle fibers and express major histocompatibility complex (MHC) class 1 antigen and release cytokines, causing muscle inflammation.10,11 HBV-associated PM has also been reported,12 so it is possible that HCC, HBV, or both may have caused PM in this patient.
The role of steroids for treating HCC-associated PM is controversial. Physicians should be aware of an increased risk of infection when using high-dose corticosteroids in patients with advanced HCC and cirrhosis. Our patient’s ability to maintain daily life was limited by his weakness; therefore, corticosteroids were given after discussion with him. As a result of corticosteroid therapy, lamivudine was needed for prevention HBV reactivation. Lamivudine has good efficacy for this indication, particularly when the HBV DNA is low, as in our patient.13,14 Most patients with HCC-associated PM have had poor prognosis and treatment outcomes. Despite high-dose corticosteroids and surgery/chemoembolization for HCC management,5–8 few patients had improvement of muscle weakness and all died from HCC-related causes within 6 months after diagnosis.
Author contributions: K. Thanapirom wrote the first draft, collected the data, and conducted the literature research. S. Aniwan conducted the literature research and drafted the article. S. Treeprasertsuk reviewed the final draft and is the article guarantor.
Financial disclosure: No conflicts of interest or sources of funding to report.
Informed consent was obtained for this case report.
Correspondence: Sombat Treeprasertsuk, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Rama4 Road, Pathumwan district, Bangkok 10330, Thailand (firstname.lastname@example.org).
Received: January 4, 2014; Accepted: March 18, 2014
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