Review Article

Epstein-Barr Virus as a Promising Immunotherapeutic Target for Nasopharyngeal Carcinoma Treatment

Table 2

EBV targets for the development of NPC immunotherapy and therapeutic vaccine in the past 10 years.

CTL specificityProminent effectsSide effectsReferences

EBV-specific cytotoxic T-lymphocytes (CTLs) immunotherapy

LMP1 & LMP2Majority of pulmonary lesions were no longer evident in patients with recurrent NPC although primary tumour did not regressSide effects such as fatigue, weakness, arthralgia, pain, haemoptysis, and epistaxis[15]
Highly efficient on patients with relapsed/refractory NPC (62% remains disease-free up to 75 months) particularly with locoregional diseaseNo long-term toxicity was reported[51]
6 out of 11 NPC patients, in whom conventional treatment has failed, showed either tumour regression or disease stabilization lasting more than 4 monthsFour patients developed grade 3 neutropenia. Two patients suffered grade 2 thrombocytopenia. One patient suffered grade 2 anaemia. Mild toxic effects such as fatigue and nausea were observed in 6 patients[52]

LMP1 & LMP2, EBNA1Refractory NPC patients showed a median survival of 478 days, while patients with no or minimal residual disease remain alive10 out of 30 patients suffered grade 1 adverse events; 6 out of 30 suffered grade 2 adverse events and 2 out of 30 suffered grade 3[53]
The median overall survival increased from 220 to 530 days compared with patients who did not receive the therapyFew patients have been reported to have flu-like symptoms, malaise, dry cough, and low blood pressure[54]

LMPs, EBNAs, BZLF1, BRKF1, BRMF1 Combination treatment of gemcitabine and carboplatin (GC) and CTL resulted in improved survival outcomesMost of the reported side effects were grade 1. Mild toxic effects such as rash, fever, and fatigue were seen[55]

LMP2, EBNAs, lytic proteins (BZLF1, BRLF1, BMLF1) Patients with recurrent NPC produced higher number of autologous CTLs following CD45 mAbsGrade 1 and 2 nonhematologic toxicities were observed among patients, including fever, abdominal pain, hypotension, and nausea. Transient neutropenia was also observed[49]

EBV-based therapeutic vaccine

Truncated LMP1 & full-length LMP2Induced delayed type hypersensitivity (DTH) responses in 9 out of 12 patientsMild nonhematological toxic effects such as fever, fatigue, and skin rash were observed in 9 patients. Total of 15 patients suffered grade 1/2 or 3 anaemia[56]

LMP2 & EBNA1Increased the T-cell responses in 15 of 18 patientsReported negative reactions at injection sites. Flu-like symptoms, fatigue, arthralgia, myalgia, headache/dizziness, and hepatotoxicity were observed[20]
Increased immunity and induced differentiation and functional diversification of responsive T-cell populationsGrade 1 and 2 injection site reaction was observed in all participants. Nine patients experienced systemic toxicity[19]