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Is Linitis Plastica a Contraindication for Surgical Resection: a Multi-Institution Study of the U.S. Gastric Cancer Collaborative

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Is Linitis Plastica a Contraindication for Surgical Resection: a Multi-Institution Study of the U.S. Gastric Cancer Collaborative Ann Surg Oncol (2016) 23:1203–1211 DOI 10.1245/s10434-015-4947-8 ORIGINAL ARTICLE – GASTROINTESTINAL ONCOLOGY Is Linitis Plastica a Contraindication for Surgical Resection: A Multi-Institution Study of the U.S. Gastric Cancer Collaborative Aaron U. Blackham, MD1, Doug S. Swords, MD1, Edward A. Levine, MD1, Nora F. Fino, MS2, Malcolm H. Squires, MD3, George Poultsides, MD4, Ryan C. Fields, MD5, Mark Bloomston, MD6, Sharon M. Weber, MD7, Timothy M. Pawlik, MD, MPH, PhD8, Linda X. Jin, MD5, Gaya Spolverato, MD8, Carl Schmidt, MD6, David Worhunsky, MD4, Clifford S. Cho, MD7, Shishir K. Maithel, MD3, and Konstantinos I. Votanopoulos, MD, Phd, FACS1 1Department of Surgery, Wake Forest School of Medicine, Winston-Salem, NC; 2Department of Biostatistics, Wake Forest School of Medicine, Winston-Salem, NC; 3Department of Surgery, Emory University, Atlanta, GA; 4Department of Surgery, Stanford University Medical Center, Stanford, CA; 5Department of Surgery, Washington University School of Medicine, St Louis, MO; 6Department of Surgery, The Ohio State University Comprehensive Cancer Center, Columbus, OH; 7Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI; 8Division of Surgical Oncology, The Johns Hopkins University School of Medicine, Baltimore, MD ABSTRACT 37.8 months, p \ 0.01). There was no difference in median Background. Current staging and treatment guidelines OS of LP patients based on stage (I/II, 17.3 mo; III, 10.6 for gastric adenocarcinoma do not differentiate between mo; IV, 12.0 mo; p = 0.46). LP and non-LP patients who linitis plastic (LP) and non-LP cancers. Significant con- underwent optimal resection (negative margin and D2/3 troversy exists regarding the surgical management of LP lymphadenectomy) had better survival compared with patients. those with nonoptimal resections. The median OS for Methods. Using the multi-institutional U.S. Gastric Can- optimally resected stage III LP (n = 22) and stage III non- cer Collaborative database, 869 gastric cancer patients who LP (n = 185) patients was nearly identical (26.7 vs. 25.3 underwent resection between 2000 and 2012 were identi- mo; p = 0.69). fied. Clinicopathologic and outcomes data of 58 LP Conclusions. Future staging systems and treatment patients were compared to 811 non-LP patients. guidelines should differentiate between LP and non-LP Results. Stage III/IV disease was more common at pre- gastric cancers. Long-term survival in select LP patients sentation in LP patients compared with non-LP patients (90 who undergo optimal resections is comparable to optimally vs. 44 %, p \ 0.01). Despite the fact that most LP patients resected non-LP patients. underwent total gastrectomy (88 vs. 39 %, p \ 0.01), final positive margins were more common in LP patients (33 vs. Linitis plastica (LP) is an uncommon variant of gastric 7%, p \ 0.01). The use of frozen section allowed 15 adenocarcinoma found in 7–14 % of cases.1,2 It represents intraoperative positive margins in 38 patients to be con- a diffusely infiltrative and desmoplastic process usually verted to negative final margins. Median overall survival involving the entire stomach giving it a stiffness described (OS) was significantly worse in patients with LP (11.6 vs. as ‘‘leather bottle stomach.’’2,3 Also referred to as Bor- rmann Type IV or scirrhous carcinoma of the stomach, LP Presented at the Gastrointestinal Cancers Symposium, San Francisco, portends a poor prognosis compared with other forms of CA, January 2015. gastric cancer.4 The diagnosis of LP carries significant controversy Ó Society of Surgical Oncology 2015 regarding its surgical management. Lymph node involve- First Received: 5 May 2015; ment is almost always present at the time of diagnosis, and Published Online: 3 November 2015 due to its diffuse nature, microscopic disease is often found 3,5 K. I. Votanopoulos, MD, Phd, FACS at the resection margins. Peritoneal dissemination is e-mail: [email protected] frequently encountered at the time of surgery or as the main 1204 A. U. Blackham et al. site of recurrence.5–7 As such, curative resection is possible minor (grade I/II) and major (grade III/IV) based on the in less than half of patients and early recurrence is com- Clavien-Dindo classification system.17 Optimal resection mon, leading to a dismal median survival, ranging from 6 was defined as patients who underwent D2 or D3 lym- to 12 months, and 5-year survival between 8 and phadenectomy and had negative final proximal and distal 13 %.2,5,6,8–11 margins (R0). It remains unknown whether its poor prognosis is simply related to its advance stage at presentation or the innate Statistical Analysis biology of the disease. Furthermore, current treatment guidelines do not differentiate between LP and non-LP Demographic and perioperative characteristics were cancers, and it is not known if the same staging system compared by LP status using ANOVA for continuous should be applied to both subtypes. The number of studies variables and Chi squared tests for categorical variables. available to assess the clinical outcomes of LP is fairly Overall survival (OS) and recurrence-free survival small and limited mostly to reports from Eastern Asia and (RFS) were estimated by using Kaplan–Meier methods. Europe.2,4–6,8,10 The primary purpose of this study was to OSwasdefinedastimetodeathorcensorshipfrom analyze perioperative and long-term outcomes following date of operation, whereas RFS was defined as time to the surgical management of LP from a large, multicenter death, recurrence, or censorship from date of operation. American database and identify potential subgroups of LP Differences in survival by LP and stage were assessed patients who derive a survival benefit from surgical by using the log-rank test. In patients with LP, uni- resection. variate and multivariate Cox proportional hazards models were used to quantify the relationships between OS and patient characteristics. The multivariate model METHODS was adjusted for age, sex, lymphovascular invasion, total comorbidities, neoadjuvant chemotherapy, adjuvant Patients were identified from the U.S. Gastric Cancer chemotherapy, adjuvant radiotherapy, type of nodal Collaborative retrospective database who underwent gas- dissection, complications, and LNR. Hypothesis testing tric resection for gastric adenocarcinoma between 2000 and was two-sided and performed at the 0.05 significance 2012 at one of seven major academic centers (Johns level. All analysis was performed in SAS Version 9.4 Hopkins Hospital, Baltimore, MD; Emory University, (Cary, NC). Atlanta GA; Stanford University, Palo Alto, CA; Wash- ington University, St. Louis, MO; Wake Forest University, Winston-Salem, NC; University of Wisconsin, Madison, RESULTS WI; The Ohio State University, Columbus, OH). This study was approved by the Institutional Review Boards of each Of the 869 patients with gastric adenocarcinoma who respective institution. Data regarding patient demographic underwent gastric resection with curative intent, LP was and clinical characteristics, perioperative variables, tumor diagnosed in 58 patients (6.7 %). These patients differed pathologic features, and multimodality therapies were ret- from non-LP patients in several ways (Table 1). Most rospectively collected by the individual institutions and notably, patients with LP were younger (61.1 vs. combined into a single database for analysis as previously 65.3 years, p = 0.017), had larger tumors (8.9 vs. 4.8 cm, reported.12,13 Patients with gross peritoneal disease and/or p \ 0.001), and were more likely to present with who underwent palliative resection or bypass procedures advanced-stage disease (stage III/IV; 90 vs. 44 %, (n = 77) were excluded. The presence of LP was reported p \ 0.001). Both T-stage and N-stage were proportionally by each individual institution and was based on clinical worse in LP patients (p \ 0.001). As expected, patients assessment (endoscopic or intraoperative) or histologic with LP were more likely to have poorly differentiated evaluation. Patients were excluded if the presence or tumors (98 % vs. 57 %, p \ 0.001). The extent of nodal absence of LP was not clearly stated (n = 19). dissection was similar in both groups (D2/D3; 62 vs. 60 %, Pathologic classification and TNM staging following p = 0.756). surgical resection were defined by AJCC, 7th edition.14 Positive resection margins occurred more often in LP The extent of lymphadenectomy was recorded based on the patients (33 vs. 7 %, p \ 0.001) despite the fact that total Japanese Gastric Cancer Association classification system gastrectomy was much more commonly performed (88 vs. (D1/D2/D3).15 Lymph node ratio (LNR) was categorized 39 %, p \ 0.001). Frozen sections of the proximal or distal into four groups (LNR1, B1/15; LNR2, 1/15\LNR B3/10; margins were performed on 38 LP patients (66 %). Sixteen LNR3, 3/10\LNR B7/10; and LNR4,[7/10) as described patients had a positive proximal margin on frozen sec- by Wang et al.16 Operative complications were classified as tion. Ten of those patients were converted to a negative final Surgical Management of Linitis Plastica 1205 TABLE 1 Comparison of demographic and perioperative data TABLE 1 continued among gastric cancer patients with or without linitis plastica who underwent curative gastric resection Linitis plastica Non-Linitis p value (%) plastica (%) Linitis plastica Non-Linitis p value (%) plastica (%) Nodal stage N0 9 (15) 322 (40) p = 0.002 Total patients (n = 869) 58 811 N1 8 (14) 154 (19) Age (yr) 61 ± 13 65 ± 12 0.017 N2 16 (28)
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