Heterochronic triple primary malignancies with Epstein-Barr virus infection and tumor protein 53 gene mutation: A case report and review of literature

Wen-Xia Peng,Xin Liu,Qi-Feng Wang,Xiao-Yan Zhou,Zhi-Guo Luo,Xi-Chun Hu

Wen-Xia Peng,Xin Liu,Zhi-Guo Luo,Xi-Chun Hu,Department of Medical Oncology,Fudan University Shanghai Cancer Center,Shanghai 200032,China

Qi-Feng Wang,Xiao-Yan Zhou,Department of Pathology,Fudan University Shanghai Cancer Center,Shanghai 200032,China

Abstract BACKGROUND The diagnosis and etiology of multiple primary malignant neoplasms (MPMNs)are difficult to establish.Here,we report a case of heterochronic triple primary malignancies with gastric cancer,nasopharyngeal squamous cell cancer,and then rectal cancer.CASE SUMMARY The patient was first diagnosed with gastric cancer at the age of 33 in 2014 and underwent distal gastrectomy and gastrojejunostomy and six cycles of adjuvant chemotherapy.Three years later,he was diagnosed with nasopharyngeal cancer and treated with radical chemoradiotherapy in 2017.Recently,a mass in the middle of the rectum was resected and reported as ulcerative,moderately to poorly differentiated adenocarcinoma.Research on the etiology of MPMNs showed that Epstein-Barr virus (EBV) infection may be the cause of gastric cancer and nasopharyngeal squamous cell cancer since these two primary lesions were positive for transcripts of EBV-encoded ribonucleic acid using an in situ hybridization EBV-encoded ribonucleic acid probe in formalin-fixed,paraffinembedded tissue.The cause of rectal cancer may be due to a somatic mutation of tumor protein 53 gene in exon 8 (c.844C>T,p.Arg282Trp) through highthroughput sequencing for the rectal cancer.Appropriate standard therapy for each primary cancer was administered,and the patient has no evidence of cancer disease to date.CONCLUSION To our knowledge,this is the first report on heterochronic triple primary malignancies whose cause may be associated with EBV infection and tumor protein 53 genetic mutations.The etiological research may not only elucidate the cause of MPMN but also has implications in clinical management.

Key Words: Multiple primary malignant neoplasms; Epstein-Barr virus infection; Epstein-Barr virus-encoded RNA; TP53 mutation; Etiology; Case report

INTRODUCTION

Multiple primary malignant neoplasms (MPMNs) refer to two or more primary malignant tumors simultaneously or successively occurring in different organs and/or tissues in the same patient,which is clinically rare and comprises only 0.52%-11.7% of all malignant cancers[1,2].Heterochronic primary malignancy is defined as the second primary cancer,which is diagnosed more than 6 mo after the diagnosis of the first primary cancer.Herein,we reviewed cases of heterochronic triple primary malignant tumors and only found 19 prior cases with heterochronic triple primary malignancies in the English literature.The increasing number of MPMN clinical cases is due to improvements in diagnostic techniques,increasingly novel evidence-based medicine,and increased survival times of cancer patients,justifying that the establishment of a confirmative diagnosis and etiology of MPMNs still plays a pivotal role in extending the life span of cancer patients.

The causes of triple primary malignant tumors are unclear,and multiple factors may synergistically contribute to the occurrence and development of cancer.Epstein-Barr virus (EBV),a ubiquitous human oncovirus,is closely associated with malignant lymphoma,nasopharyngeal carcinoma,and gastric cancer in China and eastern Asia.Studies have shown that EBV genome integration in the human cancer genome is detected in 10% of all gastric cancers and more than 95% of nasopharyngeal squamous cell cancers[3,4].EBV-positive tumors have a much poorer prognosis than EBV-negative tumors,and EBV-targeted therapies can significantly improve the prognosis of EBVassociated tumors[5,6].In addition to viral factors,many gene mutations in the human genome have been implicated in the pathogenesis of MPMNs,such as p53,breast cancer gene 1/2,phosphatase and tensin homolog,adenomatous polyposis coli (APC),p16,etc.As is well known,tumor protein 53 (P53) gene mutations,carried by more than 50% of human tumors,can induce cell cycle disturbances and inhibit cell apoptosis that contribute to the generation of most malignant tumors[7,8].In this study,we present a rare case of heterochronic triple primary malignancies with EBV infection-associated stomach cancer and nasopharyngeal cancer and TP53 mutationassociated rectal carcinoma.

CASE PRESENTATION

Chief complaints

A 39-year-old man who was 178 cm in height and 83 kg in weight came to our institute for consultation for rectal cancer resected more than 1 mo ago.

History of present illness

In February 2020,blood was found in his stool,and colonoscopy showed irregular protuberant lesions 7 cm above the anus.On April 3,2020,he was pathologically diagnosed with moderately to poorly differentiated adenocarcinoma.

History of past illness

In December 2014,the patient was admitted to the First Affiliated Hospital of Nanjing Medical University for abdominal distention.On December 9,2014,he was found to have mostly circular protuberant lesions in the gastric body and antrum by gastroscopy and then underwent distal gastrectomy and gastrojejunostomy.Histopathological examination of the surgical specimens revealed a 10 cm × 7 cm × 2 cm-sized mass,which invaded the entire layer of the gastric wall and reached the extracorporeal adipose fibrous connective tissue.This confirmed the diagnosis of stomach carcinoma with lymphoid stroma,diffuse type in the Lauren classification(Figure 1A).There was involvement of only one lymph node in the greater curvature with immunohistochemical staining including cytokeratin (CK)-L (++),Villin (+),P63(-),P40 (-),CK5/6 (-),and EBV-encoded ribonucleic acid (RNA) (EBER)in situhybridization (+) (Figure 1B).Adjuvant chemotherapy was administered after the operation.After two cycles of paclitaxel,cisplatin,and tegafur,the treatment regimen was changed to paclitaxel,oxaliplatin,and tegafur for four cycles because of Grade 4 myelosuppression.

On March 13,2017,the patient had epistaxis,and he was diagnosed with poorly differentiated squamous cell carcinoma of the nasopharynx with pathology of nasal endoscopic biopsy (Figure 2A).Immunohistochemical findings were as follows: CKpan (-),CK5/6 (-),P63 (-),Melan A (-),human melanoma black 45 (-),Ki67 (+),EBER(+) (Figure 2B),CK7 (-),CK8/18 (+),CK-L (+),and P40 (focal+).

On March 27,2017,his nasopharyngeal biopsy specimen was pathologically consulted by the Cancer Hospital of Sun Yat Sen University and Fudan University Shanghai Cancer Center,and both institutions found that there was great similarity between the gastric and nasopharyngeal lesions in terms of hemoxylin & eosin morphology and immunohistochemistry (IHC).Both of them were likely to be primary tumors,but nasopharyngeal metastasis of gastric cancer could not be completely ruled out.The patient was concurrently treated with radical radiotherapy and cisplatin chemotherapy,followed by nimotuzumab for six cycles.

Personal and family history

The patient had no history of diabetes mellitus,hypertension,or tobacco or alcohol abuse,and his family history was unremarkable.

Physical examination

The Eastern Cooperative Oncology Group score of the patient was 1,and no superficial lymph nodes could be palpated.

Laboratory examinations

His serum tumor markers and other laboratory values were all within normal range.

Imaging examinations

The patient came to our hospital.Magnetic resonance imaging indicated a rectal malignant tumor approximately 58 mm away above the anus (Figure 3A).On April 13,2020,whole-body positron emission topography/computed tomography with 18-fluorodeoxy-glucose (FDG) scanning revealed thickening of the mid-rectal wall with high FDG uptake,suggesting a malignant tumor (Figure 3B),and increased FDG uptake at the junction of rectum and colon,which was likely to be inflammatory.No abnormal FDG-uptake was observed in the rest.

Biospy

Figure 1 Histopathological and immunohistochemical staining of gastric cancer.A: Poorly differentiated carcinoma in the distal stomach with lymphoid interstitial carcinoma; B: Positive staining for Epstein-Barr virus-encoded ribonucleic acid.

Figure 2 Histopathological and immunohistochemical staining of nasopharyngeal cancer.A: Poorly differentiated squamous cell carcinoma of the nasopharynx by pathology of nasal endoscopic biopsy; B: Positive staining for Epstein-Barr virus-encoded RNA.

On April 26,2020,he underwent low anterior resection of the rectum and distal ileostomy.During the operation,the tumor was located 3 cm above the dentate line,with a size of 3 cm × 3 cm and no infiltration into the whole intestinal wall.Postoperative pathology revealed that the tumor was ulcerative,moderately to poorly differentiated adenocarcinoma (Figure 4A),a tumor size of 2.5 cm × 1.5 cm × 1 cm,infiltration into the superficial muscle layer,and T2N0,mesorectal fascia (-),and extramural venous invasion (-).IHC indicated the following tumor cells: Special ATrich sequence-binding protein 2 (+),caudal-type homeobox 2-88 (+),CK20 (+),Villin(+),human MutL homolog 1 (+),human melanocyte stimulating hormone 2 (+),human melanocyte stimulating hormone 6 (+),PMS1 homolog 1 (+),CD44 (focal+),Ecadherin (+),hair and enhancer of split-1 (+),Ki-67 (80%+),CK7 (-),human epidermal growth factor receptor 2 (-),BRAF (-),5-hydroxytryptamine receptor 2B (-),zinc finger E-box binding homeobox 1 (-),and EBER (-) (Figure 4B).

MULTIDISCIPLINARY EXPERT CONSULTATION

On Apr 20,2020,a consultation involving the whole Department of Pathology in our hospital occurred.

The pathology of the gastric lesion was performed,and based on the IHC results in the original hospital,poorly differentiated carcinoma in the distal stomach was observed,consistent with lymphoepithelioma-like carcinoma.The cancer invaded the whole gastric wall and reached the serosa without definite nerve invasion.No cancer was found in the upper or lower margins or anastomotic rings.One lymph node metastasis was found in 14 lymph nodes in the great curvature of the stomach,whereas there were no positive nodes in 37 Lymph nodes in the lesser curvature of the stomach.It is difficult to classify further into subtypes based on the Lauren classification.IHC of the original hospital was reevaluated with tumor cells of CK+++,EBER+.

The morphology of the nasopharyngeal biopsy was consistent with EBV-related undifferentiated carcinoma and p63-tumor cells.Based on the medical history,nasopharyngeal metastasis of stomach carcinoma could not be fully ruled out.

Figure 3 Axial computed tomography images reveal a rectal mass.A: Axial maximum intensive projection at the same imaging level,and coronal images showed a 40 mm solitary nodule approximately 58 mm away above the anus in the rectum; B: Axial images of positron emission topography-computed tomography at the same imaging level,and rectal image of positron emission topography-computed tomography maximum intensive projection showed a thickened medial rectum wall with homogeneous uptake of 18F-fluorodeoxy-glucose,and the maximum standardized uptake value was 14.6.

Figure 4 Histopathological and immunohistochemical staining of rectal cancer.A: Postoperative pathology revealed ulcerative,moderately to poorly differentiated adenocarcinoma; B: Negative staining for Epstein-Barr virus-encoded ribonucleic acid.

On May 14,2020,the next-generation sequencing test for his rectal cancer specimens revealed the following: 24 microsatellite (MS) loci were evaluated,and 22 MSs were analyzed.The sample status was microsatellite stable (MSS).The following pathogenic/probably pathogenic variations were detected in the paraffin tissue deoxyribonucleic acid: (1) KRAS (NM_033360.3) missense mutation in exon 4 c.436G >A (p.Ala146Thr),AF 34.43%; (2) APC (NM_000038.5) nonsense mutation in exon 16 c.3340C>T (p.Arg1114*),AF 20.54%; (3) APC (NM_000038.5 code shift mutation in exon 16 c.4127_4128del (p.Tyr1376fs),AF 22.71%; (4) TP53 (NM_000546.5) nonsense mutation in exon 9 c.991C>T (p.Gln331*),AF 3.71% (Figure 5A); (5) TP53(NM_000546.5) missense mutation in exon 8 c.844C>T (p.Arg282Trp),AF 37.89%(Figure 5B); and (6) single nucleotide polymorphisms of drug metabolism-related enzymes indicated that bilirubin UDP-glucuronosyltransferase 1A1*28,bilirubin UDPglucuronosyltransferase 1A1*6,cytochrome P450 2D6*10,dihydropyrimidine dehydrogenase*2A,and dihydropyrimidine dehydrogenase*13 were wild type.In September 2020,gene sequencing revealed that the mutation in theTP53gene was not present in the peripheral blood samples (Figure 6).

Figure 5 Next-generation sequencing test in rectal cancer specimens.A: Tumor protein 53 (TP53; NM_000546.5) nonsense mutation in exon 9 c.991C>T (p.Gln331*),AF 3.71%; B: TP53 (NM_000546.5) missense mutation in exon 8 c.844C>T (p.Arg282Trp),AF 37.89%.

Figure 6 Mutation of waveform of the tumor protein 53 gene fragment.A and B: There were no base mutations.

FINAL DIAGNOSIS

After combining clinical features and pathological findings,the patient was diagnosed with MPMN with rectal cancer (pT2N0M0,stage I) as the third primary,nasopharyngeal undifferentiated cancer as the second primary (EBER+),and gastric cancer as the first primary (pT3N1M0,stage III,EBER+).The timeline of diagnosis and treatment is shown in Figure 7.

Figure 7 The timeline of diagnosis and treatment for multiple primary malignant neoplasms.EBER: Epstein-Barr virus-encoded ribonucleic acid;TP53: Tumor protein 53.

TREATMENT

There was no adjuvant chemotherapy or radiotherapy administered.The patient was regularly followed up.

OUTCOME AND FOLLOW-UP

The patient was followed up until September 30,2020.The postoperative recovery of rectal cancer was satisfactory,and normal life was resumed.The blood tests for the tumor markers showed no findings,and the routine imaging examination showed no evidence of tumor occurrence or metastasis.The patient provided written informed consent for publication of this case report.

DISCUSSION

Currently,the diagnosis of MPMNs is mostly based on Warrenet al[9]'s revised diagnostic criteria: (1) Each tumor is pathologically confirmed as malignant; (2) Each tumor must exist independently in the anatomy; and (3) Each tumor must be excluded as metastases of other tumors.According to the time interval between the two primaries,Moertelet al[10]divided MPMN into synchronous and metachronous MPMNs[10],which occur within 6 mo and more than 6 mo,respectively.In this case,the middle-aged male patient developed three distinct primary malignant tumors within three different organs (stomach,nasopharynx,and colorectum),and the time interval between them was longer than 6 mo; thus,the progression of the patient’s disease met the criteria of the diagnosis of metachronous MPMN.

Notably,there was a debate about the pathological diagnosis of primary nasopharyngeal carcinoma in the present case.This case and published studies have shown that EBV infection-related lymphoepithelioma-like gastric cancer and nasopharyngeal carcinoma share the same characteristics,except for different sites of occurrence[11].However,90% of nasopharyngeal squamous cell cancers in China are EBER positive,and patients with gastric cancer undergo radical treatments.Furthermore,the lesion in the nasopharynx was the only cancer lesion at that time and occurred 27 mo after the gastric cancer.Therefore,the tumor board of the multidisciplinary team for Cancer of Multiple and Unknown Primaries in Fudan University Shanghai Cancer Center agreed on nasopharyngeal carcinoma as the second primary carcinoma.

Possible causes of MPMN include abnormal activation of oncogenes,silencing of tumor suppressor genes,epigenetic alterations,chromosome instability,immune deficiency,exposure to environmental factors,and an unhealthy lifestyle[12-14].Recently,EBV has become the focus of attention of many scholars.EBV,a double-stranded deoxyribonucleic acid virus with a length of approximately 172 kb,mainly attacks human B lymphocytes and epithelial cells through proliferative infection and latent infection,and the virus is mostly in the state of latent infection and does not replicate[15].EBV has an infection rate of 1.09% in the general population and is linked to the development of two major epithelial malignancies,including gastric and nasopharyngeal carcinoma[16].EBV-encoded small RNA (EBER,EBER1,and EBER2),used as a molecule to signal EBV infection in tissues byin situhybridization,is highly expressed in latent EBV-infected cells to evade immune surveillance and maintain lifelong latent infection[17,18].EBER1/2 could promote the growth of cells,regulate the innate immune system,and promote the formation of tumorsviathe following mechanisms: Adjusting the interleukin-6/signal transducer and activators of transcription-3/P21 and p27 pathways to promote the occurrence of gastric cancer,promoting the expression of focal adhesion kinase phosphorylation to promote cancer cell migration,and serving as an autocrine growth factor to promote the growth of cancer cells[19,20].Several reports have shown that early diagnosis and early intervention of EBV infection are helpful to improve the prognosis of EBV virus-associated tumors.The patient denied smoking,drinking,and other bad living habits,which might exclude lifestyle carcinoma,and had no family history of cancer,which can exclude familiar and hereditary cancer; therefore,EBV infection may be the common cause for gastric and nasopharyngeal cancer.

However,the EBER transcript was not found in the colorectal cancer of the patient.The allele frequencies of the K-ras gene missense mutation,APC gene shift mutation,andTP53gene missense mutation (exon 8) were 34.43%,22.7%,and 37.89% by nextgeneration sequencing,respectively.Moreover,the mutation in theTP53genes in the patient was a somatic heterozygous mutation,and no germline gene mutations were found,providing a direction for us to explore the etiologic factors of the third primary cancer.

Lvet al[2]reported that the most common organ of MPMN involved the digestive system with adenocarcinoma,including the stomach and the esophagus[2].A literature review of metachronous triple primary neoplasms was performed after searching the PubMed database.Only 19 cases of clinical metachronous triple primary neoplasms have been reported between 1995 and 2020.Table 1 shows a summary of the previous studies describing metachronous triple primaries.Approximately half of the patients had primary colorectal cancer.There have been no reports of heterochronic triple primary malignancies with gastric cancer,nasopharyngeal cancer or rectal cancer.Katoet al[21]reported a high incidence of gastric cancer complicated with colorectal cancer[21].Colorectal cancer is the fourth most common malignant tumor in China,posing a serious threat to human health.Obviously,there were different etiologic factors for gastric and rectal cancers in this patient.

In this study,the patient was 6 years past the first onset of primary gastric cancer,2 more years past the second primary nasopharyngeal cancer,and 7 mo past the third primary rectal cancer.All the treatment of this patient followed the guidelines for each primary cancer.Currently,this patient is in good survival condition without any evidence of recurrence or metastasis.Generally,patients with MPMN have a better prognosis than other cancer patients with no MPMN.As expected,the misdiagnosis of a primary lesion as the metastasis of the prior cancer can lead to incorrect treatment and a poor prognosis.

CONCLUSION

The occurrence of triple heterochronic primary malignancies associated with EBV infection and genetic mutations is an extremely rare event.To the best of our knowledge,this is the first case of a 39-year-old male patient with triple heterochronic primary tumors including EBV-associated stomach cancer and nasopharyngeal cancer and TP53 mutant rectal carcinoma in the literature,and appropriate therapy for each primary cancer led to his good clinical outcome.This case further confirms the value of precision medicine; only a precise diagnosis can lead to appropriate treatment and good prognosis.Further research is needed to elucidate the role of EBV infection and theTP53gene in the carcinogenesis of MPMN.

Table 1 Summary of all existing cases of heterochronic triple primary malignancies in the English literature,n = 19

CT: Computed tomography; DFS: Disease free; DOD: Died of disease; ET: Endocrinotherapy; F: Female; M: Male; NED: No evidence of disease; NM:Not mentioned; RT: Radiotherapy.