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        Individualized treatment for gastric cancer with rib metastasis:A case report

        2021-01-15 06:42:14

        Yu Zhang,Zhen-Xing Zhang,Geng-Yuan Hu,Feng Tao,Min-Feng Ye,Department of Gastrointestinal Surgery,Shaoxing People's Hospital;Shaoxing Hospital,Zhejiang University School of Medicine,Shaoxing 312000,Zhejiang Province,China

        Zeng-Xin Lu,Department of Radiology,Shaoxing People's Hospital;Shaoxing Hospital,Zhejiang University School of Medicine,Shaoxing 312000,Zhejiang Province,China

        Fang Liu,Department of Pathology,Shaoxing People's Hospital;Shaoxing Hospital,Zhejiang University School of Medicine,Shaoxing 312000,Zhejiang Province,China

        Abstract BACKGROUND Gastric cancer (GC) with bone metastasis is rare,and rib metastasis is even less common.The clinical prognosis of GC with bone metastasis is poor given the lack of an effective treatment.CASE SUMMARY A 70 year old man was referred to Shaoxing People’s Hospital with left chest pain and slight dyspnea.Chest computed tomography (CT) revealed a metastatic lesion in the left 3rd rib.Esophagogastroduodenoscopy revealed several ulcers in the angle and antrum of the stomach,and tumor biomarkers including CEA and CA-199 were clearly increased.In addition,lymph node metastasis in the lesser curvature of the stomach was identified by positron emission tomography/CT scanning.Further pathological examination confirmed metastatic adenocarcinoma in the rib and medium-low differentiated adenocarcinoma in the gastric space.The patient had GC with rib metastasis,and was clinically staged as T3NxM1 (IVB).Based on multidisciplinary team opinions,the patient received five courses of chemotherapy (CAPOX plus aptinib),and then underwent rib resection and laparoscopic radical distal gastrectomy.The patient started four courses of chemotherapy after surgery,and then capecitabine and aptinib were administered orally for 3 mo.Follow-up was performed on an outpatient basis using abdominal/chest CT and tumor biomarkers.The patient exhibited an overall survival greater than 2 years,and the disease-free survival was approximately 18 mo.His adverse events were tolerable.CONCLUSION The incidence of GC with rib metastases is extremely low,and patients can obtain more benefits from individualized treatment formulated by multidisciplinary team.Chemotherapy plus surgery might represent an alternative option for GC with rib metastasis.

        Key Words:Gastric cancer;Rib metastasis;Chemotherapy;Apatinib;Surgery;Case report

        INTRODUCTION

        Gastric cancer (GC) with bone metastasis is infrequent,and rib metastasis is even less common.The clinical prognosis of GC with bone metastasis is poor given lack of an effective treatment[1,2].It has been reported that the incidence of bone metastasis in GC is 0.9%-2.1%,and the incidence of bone metastasis in postoperative GC is approximately 0.9%-1.8%[3-6].As a special bone metastasis in GC,rib metastasis is relatively rare clinically,and its treatment options are limited.To our knowledge,there is still no large retrospective report about the incidence of rib metastasis in GC.Only a few cases have been mentioned in clinical analysis.Mikamiet al[7]reported ten patients who were radiologically diagnosed as having GC with rib metastasis between January 2010 and December 2015.Wenet al[8]reported 31 GC cases with rib metastasis that were identified from a retrospectively conducted gastric cancer database in their institute between April 2008 and April 2018.Thus,there are a variety of rib metastasis patients who were included in the reports about the incidence of GC with bone metastasis.Correspondingly,there is no specialized report about the treatment for GC with rib metastasis.We present a successful treatment case of GC with rib metastasis,viachemotherapy and surgery under the guidance of multidisciplinary team (MDT)that led to a long-term tumor-free survival in the patient.

        CASE PRESENTATION

        Chief complaints

        A 70yearold man was referred to Shaoxing People’s Hospital with left chest pain and slight dyspnea but without significant loss of body weight.

        History of present illness

        On September 6,2018,the patient was admitted to our hospital with outpatient chest CT indicating a lump of approximately 10.0 cm × 5.2 cm in the left 3rdrib with an unclear surrounding boundary,mainly growing into the pleural cavity.Positron emission tomography (PET)/CT examination showed that the maximum standardized uptake values (SUV) in the gastric antrum and left 3rd rib were abnormally increased.Further esophagogastroduodenoscopy confirmed several ulcers in the angle and antrum of the stomach,and pathology suggested HER-2(-) low-grade adenocarcinoma.Puncture biopsy of the rib was performed,which confirmed metastatic adenocarcinoma by pathology (Figure1).CAPOX pus apatinib were selected as the chemotherapy regimen for five courses.Left 3rdrib resection and laparoscopic distal gastrectomy D2 lymph node dissection were performed.The patient recovered well,and was administered four courses of the same chemotherapy half a month after the operation.Then capecitabine and aptinib were given orally for 3 mo.

        History of past illness

        The patient suffered from hypertension,asthma,and chronic bronchitis for years.

        Personal and family history

        No family history was identified.

        Physical examination

        Physical examination revealed mild tenderness in the left chest.

        Laboratory examinations

        Routine blood and biochemical examinations showed no obvious abnormalities.Tumor biomarkers were present at the following levels:CEA = 60.51 ng/mL,CA199 =2773.4 U/mL,CA242 >300 IU/mL,and CA50 >500 IU/mL.Then,these levels gradually returned to normal levels with chemotherapy (Figure2).

        Imaging examinations

        PET/CT examination showed that the maximum SUV in the gastric antrum (SUVmax=3.6) and the left 3rdrib (SUVmax= 8.05) were abnormally increased.After five courses of chemotherapy,PET/CT suggested that the activity of gastric lesions was moderately reduced,whereas metastatic lymph nodes were devitalized.The activity of metastatic tumors in the rib was significantly reduced (Figure3).

        FINAL DIAGNOSIS

        The preoperative diagnosis was GC with left 3rdrib metastasis,and the tumor was clinically staged as T3NxM1 (IVB).The final pathologic report was ypT1N1M0(IB).

        TREATMENT

        CAPOX pus apatinib was selected as the chemotherapy regimen.Capecitabine (1500 mg/m2per day) was orally administered twice daily for the first 2 wk of a 3 wk course,and aptinib (started with 500 mg/body per day,then decreased to 250 mg/body per day) was administered orally throughout the 3-wk course.Oxaliplatin was given as an intravenous infusion of 130 mg/m2per day on day 1 of each course.Zoletriphosphate was used to alleviate chest pain,and chest and abdominal CT were used to evaluate changes in the size of primary and metastatic lesions after every two courses of chemotherapy.After five courses of chemotherapy,left 3rdrib resection was performed on February 4,2019,and postoperative pathology suggested complete regression of rib metastasis.Laparoscopic distal gastrectomy and D2 lymph node dissection were performed on March 4,2019,and postoperative pathology suggested ulcerative gastric adenocarcinoma with moderate differentiation (Figure4).The patient started the same chemotherapy as previously noted for four courses half a month after the operation.Then,capecitabine and aptinib were administered orally for 3 mo.

        OUTCOME AND FOLLOW-UP

        The patient’s overall survival was >2 years,and the disease-free survival was approximately 18 mo.The patient has been monitored regularly in the outpatient department and no tumor recurrence has been noted to date.

        Figure1 Initial endoscopic and pathology examination.A:Esophagogastroduodenoscopy revealed several ulcers in the angle and antrum of the stomach;B:Pathology suggested low grade adenocarcinoma (× 100).Immunohistochemistry revealed HER-2(-);C:The biopsy pathology of the rib suggested metastatic adenocarcinoma (× 100).Immunohistochemistry showed CK7(-),CK20(+),CDX2(+),TTF-1(-),NapsinA (-),and TG (-).

        Figure3 Positron emission tomography/chest computed tomography scanning presentation at different times.A-D:Baseline lesions.A:Rib bone metastasis,SUVmax = 8.08;B:Gastric tumor,SUVmax = 3.65;C:Metastatic lymph nodes 1,SUVmax = 6.5;D:Metastatic lymph nodes 2,SUVmax = 3.2.E-H:Changes in the target lesions after five courses of chemotherapy.E:Rib metastasis,SUVmax = 2.65;F:Gastric tumor,SUVmax = 3.58;G and H:Metastatic lymph nodes,SUVmax = 0.

        DISCUSSION

        Figure4 Postoperative specimens and pathologies.A:Left 3rd rib metastasis;B:Pathology of metastasis,with complete regression and no metastatic tumor left (tumor regression grade classification:0,× 100);C:Gastric cancer;D:Pathology of ulcerative gastric moderately differentiated adenocarcinoma that infiltrated into the submucosa and adjacent to the superficial muscle layer locally,low-grade intraepithelial neoplasia of some glands in the surrounding mucosa,and tumor stroma infiltrated with a small amount of inflammatory cells,with 1/36 lymph node metastasis (partial response,tumor regression grade classification:2,× 100).Immunohistochemistry revealed CD34(+),blood vessels(+),CDX2(+),CgA(-),CK20(-),CK7(+),CKpan(+),CyclinD1(+),EGFR(+),Ki-67 (+75%),P53(+),Survivin(+),Syn(-),CerbB-2(2+),MLH1(+),MSH2(+),MSH6(+),and PMS2(+).

        Currently,the most effective treatment for GC is radical gastrectomy with D2 lymph node dissection.Once GC transfers to bone tissues,the prognosis is extremely poor.The survival time is typically less than half a year because GC with bone metastasis is mostly found in those types with poor pathological differentiation,a large number of lymph node metastases,and late T stage.Studies have reported that the 8-mo and 1-year survival rates of patients with GC with bone metastasis were 18.3% and 3.3%,respectively.A survival rate of greater than 2 years has not been reported[9,10].In recent years,the diagnosis and treatment of GC with bone metastasis have greatly improved.It has been reported that the survival of GC with bone metastasis patients can be improved by systemic chemotherapy[11].S-1 plus oxaliplatin,docetaxel plus S-1,and FOLFOX were the most common regimens for first-line chemotherapy.Case reports from Japan revealed good therapeutic effects of S-1 plus cisplatin for bone metastasis[12,13].In addition to chemoradiotherapy,the available treatment options for GC with bone metastasis can also be combined with other treatment methods,such as targeted therapy,biotherapy,and immunotherapy.Therefore,for GC with bone metastasis,individualized treatment formulated according to the actual situation can obtain more benefit and maximize the survival time.

        For GC patients with metastasis,radical resection of primary and metastatic lesions can also improve overall survival.A retrospective study enrolled 414 patients with GC associated with a single distant metastasis.In total,333 patients only received palliative chemotherapy,and 81 patients underwent gastrectomy + D2 lymph node dissection after conversion chemotherapy.The study demonstrated that patients with liver metastasis may benefit from aggressive surgery[14].In this patient,the metastatic lesion was simple and localized to one rib compared to spinal,pelvis,skull,and femur metastases,and the rib was looser and easily subject to radical resection.The primary lesion and metastasis were both potentially resectable when viewed separately.However,radiography examination revealed that the primary lesion had perigastric lymph node metastasis,whereas rib metastasis boundary with surrounding tissue was unclear.Thus,radical resection was difficult.In patients with liver metastases from GC who underwent resection for primary cancer and metastasis,55 research centers in 17 European countries and Japan conducted a questionnaire survey and found that most centers recommend that patients undergo resection of the primary lesion and metastasis after preoperative chemotherapy[15].Based on these experiences,MDT first suggested neoadjuvant chemotherapy.

        Fluorouracil,platinum,and paclitaxel are the primary chemotherapeutic agents for advanced GC.The first-line chemotherapy is usually a two- or three-drug regimen based on fluorouracil,combined with platinum and/or paclitaxel[16-19].Evidence in the literature has confirmed that chemotherapy with a two-drug combination is routinely recommended for advanced GC in first-line treatment[20-23].Meanwhile,oral fluorouracil (S-1,capecitabine) is tantamount to intravenous 5-FU and oxaliplatin can substitute for cisplatin.In China,the priority for platinum is oxaliplatin due to better toleration in patients and the real-world clinical application[24,25].Therefore,we selected a two-drug combination of oxaliplatin and capecitabine.The patient was simultaneously administered apatinib to improve the effect of chemotherapy based on some studies by Chinese scholars,which demonstrated that apatinib can improve the therapeutic effect of advanced GC.Penget al[26]reported a real-world study of apatinib for GC in first-line therapy and suggested that the median PFS was 3.33 mo and 5.03 mo for apatinib alonevsapatinib plus chemotherapy,respectively,which was statistically significant.Chenget al[27]conducted a phase II clinical study (Ahead-G325)and showed that patients with unresectable advanced GC could benefit from conversion therapy with apatinib in combination with S-1/paclitaxel/cisplatin/5-FU.The median-survival time was 30.2 mo in the surgical group compared to 8.9 mo in the nonsurgical group.

        After five courses of chemotherapy,the evaluation suggested that chemotherapy was effective.Both the primary tumor and metastatic tumor exhibited a partial response,indicating the possibility for surgical resection,and the patient smoothly received radical distal gastrectomy and left third rib resection.Postoperative pathology demonstrated that the rib metastasis had a complete response and the gastric lesion showed a partial response,suggesting that CAPOX plus aptinib was highly effective in this patient.

        On the other hand,based on the data from the phase III study,apatinib was approved in October 2014 by the China Food and Drug Administration for patients with metastatic gastric or gastroesophageal junction adenocarcinoma after second-line chemotherapy[28].We must note that the use of apatinib in GC with rib metastasis in first-line treatment is currently controversial because the benefit from apatinib is unclear statistically.

        CONCLUSION

        We provide a very special case of GC with simultaneous rib metastasis.Fortunately,the patient had a very good outcome after MDT-guided individualized treatment.Chemotherapy plus surgery represents a potential alternative option for GC with rib metastasis,but the role of apatinib in this type of treatment needs to be further investigated.

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