Association between tumour infiltrating lymphocytes, histotype and clinical outcome in epithelial ovarian cancer
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1 James et al. BMC Cancer (2017) 17:657 DOI /s x RESEARCH ARTICLE Open Access Association between tumour infiltrating lymphocytes, histotype and clinical outcome in epithelial ovarian cancer Fiona R. James 1,3*, Mercedes Jiminez-Linan 2, Jennifer Alsop 3, Marie Mack 3, Honglin Song 3, James D. Brenton 3, Paul D. P. Pharoah 4 and H. Raza Ali 5 Abstract Background: There is evidence that some ovarian tumours evoke an immune response, which can be assessed by tumour infiltrating lymphocytes (TILs). To facilitate adoption of TILs as a clinical biomarker, a standardised method for their H&E visual evaluation has been validated in breast cancer. Methods: We sought to investigate the prognostic significance of TILs in a study of 953 invasive epithelial ovarian cancer tumour samples, both primary and metastatic, from 707 patients from the prospective population-based SEARCH study. TILs were analysed using a standardised method based on H&E staining producing a percentage score for stromal and intratumoral compartments. We used Cox regression to estimate hazard ratios of the association between TILs and survival. Results: The extent of stromal and intra-tumoral TILs were correlated in the primary tumours (n = 679, Spearman s rank correlation = 0.60, P < 0.001) with a similar correlation in secondary tumours (n = 224, Spearman s rank correlation = 0.62, P < 0.001). There was a weak correlation between stromal TIL levels in primary and secondary tumour samples (Spearman s rankcorrelation=0.29,p < 0.001) and intra-tumoral TIL levels in primary and secondary tumour samples (Spearman s rankcorrelation=0.19,p = ). The extent of stromal TILs differed between histotypes (Pearson chi2 (12d.f.) 54.1, P < ) with higher levels of stromal infiltration in the high-grade serous and endometriod cases. A significant association was observed for higher intratumoral TIL levels and a favourable prognosis (HR % CI p =0.047). Conclusion: This study is the largest collection of epithelial ovarian tumour samples evaluated for TILs. We have shown that stromal and intratumoral TIL levels are correlated and that their levels correlate with clinical variables such as tumour histological subtype. We have also shown that increased levels of both intratumoral and stromal TILs are associated with a better prognosis; however, this is only statistically significant for intratumoral TILs. This study suggests that a clinically useful immune prognostic indicator in epithelial ovarian cancer could be developed using this technique. Keywords: Tumour infiltrating lymphocytes (TILs), Epithelial ovarian cancer, Standardised method, Histological subtype, Survival time * Correspondence: fiona.james11@nhs.net 1 Lancashire Teaching Hospitals Foundation NHS Trust, Lancashire, UK 3 Department of Oncology, University of Cambridge, Cambridge, UK Full list of author information is available at the end of the article The Author(s) Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License ( which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated.
2 James et al. BMC Cancer (2017) 17:657 Page 2 of 7 Background Ovarian carcinoma is the fourth most common cancer in women worldwide but it is responsible for the most fatalities due to gynaecological malignancy in the developed world [1]. Known prognostic factors include tumour characteristics (grade, histotype, clinical stage), patient factors (age, fitness, smoking status), treatment factors, and the response to first line treatment [2]. There is evidence that some epithelial ovarian tumours evoke an immune response and that this affects prognosis [3]. Several studies have investigated the effect of various subtypes of immune cell response on prognosis in ovarian cancer [4 20]. These studies have been of modest sample sizes ranging from 9 through to 500 tumours. Immunohistochemistry was used to investigate the immune response, but they have shown conflicting results (outlined in Table 1), though most suggest that CD3(+) and CD8(+) tumour infiltrating lymphocytes are associated with a favourable outcome. Immune infiltration has also been shown to be enriched in some molecular subtypes of ovarian cancer [21]. The anti-tumour immune response is perhaps most easily assessed morphologically using standard histopathology based on haematoxylin and eosin (H&E) staining. Therefore this may represent the most promising avenue for clinical translation. However, no study has yet investigated the effect of total tumour infiltrating lymphocytes (TILs) on prognosis in ovarian cancer. There have been calls for the use of a standardised method of evaluating TILs in cancer and incorporating it clinically as a prognostic variable [22]. Haematoxylin and eosin (H&E) staining and visual analysis is a recognised cheap and clinically accessible method of evaluating TILs. A standardised method for H&E visual evaluation of TILs has been validated in the context of breast cancer [23]. We investigated the pathological and prognostic significance of TILs in epithelial ovarian cancer. We used a standardised method of TIL evaluation and a large prospective population-based study of epithelial ovarian cancer to achieve this. Methods Study population The SEARCH ovarian cancer study is an ongoing, population-based ovarian cancer case control study, covering the regions served by the East Anglia and West Midlands cancer registries in the UK. All patients diagnosed in East Anglia with invasive epithelial ovarian cancer under the age of 70 years since 1991, and still alive in 1998 when recruitment started are eligible to participate. Details of this study and its participants have been published previously [24]. To date over 2500 women with epithelial ovarian cancer have been recruited. We have retrieved archival, formalin-fixed, paraffin-embedded (FFPE) tumour tissue from the primary surgery from 707 SEARCH participants with invasive epithelial ovarian cancer. A total of 953 samples have been retrieved including tumour from both primary and metastatic sites. Survival time data were available through the regional cancer registry which obtains notification of deaths by death certificate flagging through the Office of National Statistics. The lag times for this are a few weeks for cancer deaths and two months to a year for non-cancer deaths. In addition, the cancer registry checks vital status by querying the National Health Service Strategic Tracing Service. Vital status was ascertained at the end of June 2015 and all analyses were censored on 31 December 2014 to allow for delay in reporting of vital status. Ovarian cancer specific mortality was defined as deaths where ovarian cancer was listed as the cause of death on Parts 1a, 1b, or 1c of the death certificate. Evaluation of tumour infiltrating lymphocytes Formalin-fixed, paraffin-embedded tumour samples were sectioned and stained using hematoxylin and eosin. The morphology was reviewed by a gynaecological pathologist (MJ-L). Full face stained sections were then scanned and the digital images were used for evaluation of TILs. Evaluation of TILs was performed by manual visual assessment of percentage area covered by lymphocytes, following a standardised method as described in Salgado et al. [23]. In this method the area within the tumour border is selected, the intra-tumoral and stromal compartment are defined, only areas of mononuclear lymphocytic infiltrate are included, and the percentage area is assessed at low (4 objective) and high magnification (10 objective). The percentage categories used were 1%, 5% and the nearest 10% up to 100%. The intra-tumoral and stromal compartments were scored separately. The intra-tumoral and stromal TILs were classified into three groups for the purpose of analysis very low (1%), low (5%) and high ( 10%). Representative examples of tumours with very low, low and high TIL are shown in Fig. 1. Statistical analysis The proportion of tumours in the three TIL score categories by other histopathologic characteristics was compared using the Pearson χ2- test. Multi-variable Cox regression was used to assess the association between TILs and disease-specific mortality. Follow-up time was adjusted for delayed study entry by using the date of study entry as the start of time at risk (left truncation) [25]. All models were adjusted for FIGO stage (stage 1 4 treated as an ordinal variable), histotype (seven categories) and age at diagnosis. Analyses were censored at 10-years of follow-up or on death from a cause other than ovarian cancer. Stata 14 (Stata Corp, College Station, Texas, USA) statistical software was used for all analyses.
3 James et al. BMC Cancer (2017) 17:657 Page 3 of 7 Table 1 Studies investigating immune cell response and effect on prognosis in epithelial ovarian cancer Paper Study Sample size Type of immune infiltrate Conclusion Effect on prognosis Woo, E.Y. et al., 2001 [4] Immunohistochemistry and flow cytometric analysis 9 CD4(+)CD25(+) T cells CD8(+)CD25(+) T cells Increased % of CD4(+)CD25(+) T cells present in ovarian cancer. expressed low levels of CD25 Not discussed Zhang et al., 2003 [5] Immunohistochemistry 186 CD3(+) T cells The presence of intratumoral T cells correlated with delayed recurrence and an increased expression of IFN γ, IL-2, within the tumor. The absence of intratumoral T cells was associated with increased levels of VEGF. Increased CD3(+) T cells is associated Curiel, T.J., et al., 2004 [6] Immunohistochemistry 104 CD4(+)CD25(+)FOXP3(+) T(reg) cells T(reg) cells suppress tumor-specific T cell immunity and contribute to growth of human tumors in vivo. T(reg) cells are associated with a high death hazard and reduced survival T(reg) cells are associated with reduced survival Sato, E., et al., 2005 [7] Immunohistochemistry 117 CD3(+) T cells CD8(+)/CD4(+) T cell ratio Increased CD8+ T cells is associated with No association between CD3+ TILs and survival Increased CD8(+):CD4(+) associated with better survival Increased CD8+ T cells is associated No association between CD3+ TILs and survival Increased CD8(+):CD4(+) associated Hamanishi, J., et al., 2007 [8] Immunohistochemistry 70 PD-L1 expression on tumour cells Increased PD-L1 expression on tumour cells is associated with decreased and decreased survival Increased CD8(+) t cells is independently associated Increased CD8(+) t cells is associated Tomsova et al., 2007 Immunohistochemistry 116 CD3(+) T cells CD3(+) TILs are associated Increased CD3(+) T cells is associated Shah, C.A., et al., 2008 [10] Immunohistochemistry 119 CD3(+) T cells CD68(+) TAMs FoxP3(+) Tregs TIL and TAM levels are positively correlated Patients with greater TILs are more likely to be optimally cytoreduced The presence of circulating tumor DNA does not correlate with TILs, TAMs, or Tregs No association between any cell type and survival seen No association between any cell type and survival seen Adams, S.F., et al., 2009 [11] Immunohistochemistry 134 CD3(+) T cells FoxP3(+) Tregs Increased is associated with No difference in survival associated with the other cell types Increased is associated No difference in survival associated with the other cell types Clarke, B., et al., 2009 [12] Immunohistochemistry 500 CD3(+) T cells Increased is associated with Increased CD3(+) T cells is not associated with any difference in survival On subgroup analysis: For serous ovarian carcinomas, increased CD3(+) and CD8(+) T-cells correlated with improved survival For endometrioid and clear cell carcinomas Increased is associated Increased CD3(+) T cells is not associated with any difference in survival
4 James et al. BMC Cancer (2017) 17:657 Page 4 of 7 Table 1 Studies investigating immune cell response and effect on prognosis in epithelial ovarian cancer (Continued) there is no association between CD3(+) or CD8(+) and survival Leffers et al., 2009 [13] Immunohistochemistry 306 CD45RO(+) Tmems FoxP3(+) Tregs increased CD8(+) CTL and CD8(+)/FoxP3(+) ratio is associated in advanced stage patients increased CD8(+) T cells and FoxP3(+) Tregs is associated with Stumpf et al., 2009 [14] Immunohistochemistry 100 CD20(+) B cells CD3(+) T cells CD4(+) T cells CD3(+) T cells and are associated Webb et al., 2014 [15] Immunohistochemistry 497 CD103(+) T cells CD103(+) TILs comprise intraepithelial, activated, and NK cells and are strongly associated with patient survival in HGSC Darb-Esfahani et al [16] Immunohistochemistry 215 CD3+, PD-1+, and PD-L1+ T cells CD3+, PD-1+, and PD-L1+ TILs densities were correlated Moreover, high PD-1+ TILs as well as PD-L1+ TILs densities added prognostic value to CD3 + TILs Woulters et al [17] Immunohistochemistry 171 CD27(+) T cells A prognostic benefit for patients with high intratumoral CD8(+) TIL was observed if primary surgery had resulted in a complete cytoreduction, optimal or incomplete cytoreduction fully abrogated the prognostic effect of CD8(+) TIL. Neither CD8(+) nor CD27(+) cell infiltration was of prognostic benefit in patients treated with neoadjuvant chemotherapy. Bösmüller et al [18] Immunohistochemistry 135 CD3 T cells CD103 T cells Both the presence of CD103 cells, as well as high numbers of intraepithelial CD3 lymphocytes (CD3E), showed a significant correlation with overall survival Strickland et al [19] Immunohistochemistry 245 CD3+ T cells CD8+ T cells Increased CD3+ and CD8+ TILs associated Kroeger et al [20] immunohistochemistry CD20+ Tcells CD4+ Tcells CD8+ T cells Plasma cells CD8(+) TIL carried prognostic benefit only in the presence of PCs and these other TIL subsets. Table abbreviations: Tregs regulatory T cells, TAM tissue associated macrophages, Tmems memory T cells increased CD8(+) CTL and CD8(+)/ FoxP3(+) ratio is associated with in advanced stage patients increased and FoxP3(+) Tregs is associated CD3(+) T cells and are associated CD103(+) TILs are strongly associated with patient survival in HGSC CD3+,PD-1+,andPD-L1+TILsdensities were correlated in HGSC CD8+ TILs interact with treatment to affect prognosis Both the presence of CD103 cells, as well as high numbers of intraepithelial CD3 lymphocytes (CD3E), showed a significant correlation with overall survival Increased CD3+ and CD8+ TILs associated CD8(+) TIL carried prognostic benefit only in the presence of PCs and these other TIL subsets.
5 James et al. BMC Cancer (2017) 17:657 Page 5 of 7 Fig. 2 Number of patients by available tumour sample There was a moderately strong correlation between the extent of stromal and intra-tumoral TIL levels in the primary tumour (n = 679, Spearman s rank correlation = 0.60, P < 0.001) with a similar correlation in secondary tumours (n = 224, Spearman s rank correlation = 0.62, P < 0.001). Secondary tumour samples were either omental metastases or metastases at other sites. We used the data for the omental metastases in preference to data for other metastases if present; otherwise the data from the other metastases was used. We also evaluated the correlation between TIL levels in primary and metastatic tumours using data from the 196 women for whom both a primary and a secondary tumour sample was available. There was a statistically significant but weak correlation between stromal TIL levels in primary and secondary tumour samples (Spearman s rankcorrelation = 0.29, P < 0.001) and intra-tumoral TIL levels in primary and secondary tumour samples (Spearman s rank correlation = 0.19, P = ) (Table 3). Fig. 1 Representative examples of tumours with very low, low and high TIL Results Data were available for 953 invasive epithelial ovarian tumours (primary and/or metastatic), from 707 women. Of these, primary tumour material was available for 682 cases, omental tumour material for 161 cases and other metastasis material was available for 114 cases (Fig. 2). The clinical characteristics (age at diagnosis and stage) of these cases by histotype are shown in Table 2. Table 2 Clinical characteristics of ovarian cancer cases included in this study Histotype Mean age Stage at diagnosis I/II (% a ) III/IV (%) Unknown Total LGSC (25) 15 (75) 3 23 HGSC (29) 192 (71) Mucinous (91) 4 (9) 5 48 Endometrioid (91) 11 (9) Clear cell (91) 7 (9) 5 82 Other (64) 22 (36) 8 69 Borderline (100) 0 (0) 3 36 Total (60) 251 (40) LGSC low-grade serous cancer, HGSC high-grade serous cancer a percent of those with known stage
6 James et al. BMC Cancer (2017) 17:657 Page 6 of 7 Table 3 Association between tumour infiltrating lymphocyte levels in primary and secondary tumours for stromal and intratumoral infiltrating lymphocytes Primary tumour Secondary tumour infiltrating lymphocytes infiltrating lymphocytes <5% 5 9% 10% Total Stromal <5% % % Total Intra-tumoral < 5% % % Total The extent of stromal TIL levels differed between histotypes (Table 4, Pearson chi2 (12d.f.) 54.1, P < ) with higher levels of stromal infiltration in the high-grade serous and endometriod cases. However, there was little difference in the degree of intra-tumoral infiltrating lymphocytes by histotype (Pearson chi2 (12d.f.) = 15.0, P = 0.24). We assessed the impact of tumour infiltrating lymphocytes on ovarian cancer specific mortality after diagnosis using multi-variable Cox proportional hazards regression. Table 4 Intra-tumoral and stromal tumour infiltrating lymphocyte levels by histotype Histotype Tumour infiltrating lymphocyte level Number (%) <5% 5 9% 10% Total Stromal Low-grade serous 13 (57) 8 (35) 2 (9) 23 High-grade serous 122 (39) 85 (27) 107 (34) 314 Mucinous 28 (58) 12 (25) 8 (17) 48 Endometrioid 68 (50) 29 (22) 38 (28) 135 Clear cell 58 (71) 12 (15) 12 (14) 82 Other 33 (48) 18 (26) 18 (26) 69 Borderline 30 (83) 4 (11) 2 (6) 36 Total 352 (50) 168 (24) 187 (26) 707 Intra-tumoral Low-grade serous 20 (87) 1 (4) 2 (9) 23 High-grade serous 240 (76) 47 (15) 27 (9) 314 Mucinous 43 (90) 3 (6) 2 (4) 48 Endometrioid 108 (80) 20 (15) 7 (5) 135 Clear cell 69 (84) 8 (10) 5 (6) 82 Other 58 (84) 8 (12) 3 (4) 69 Borderline 34 (94) 2 (6) 0 (0) 36 Total 572 (81) 89 (13) 46 (7) 707 The extent of tumour infiltrating lymphocytes in three categories (<5%, 5 9%, 10%) was treated as an ordinal variable in the model. An increase in stromal TIL levels was associated with a slightly better prognosis but the difference was not statistically significant (HR % CI p = 0.091). A slightly stronger and nominally significant association was observed for intra-tumoral TIL levels (hazard ratio = 0.74, P = 0.047). When the extent of both stromal and intra-tumoral TIL levels were included in a multi-variable model the effect of the intra-tumoral TIL levels was similar (HR % CI p = 0.047), but the association of the stromal lymphocytes was attenuated (HR % CI p = 0.78). There was little evidence for heterogeneity of effect of intra-tumoral TIL levels by histotype, although the effect was strongest in the high-grade serous cases (HR % CI p =0.034). Discussion This study is the largest collection of epithelial ovarian tumour samples evaluated for TILs, with almost double the number of tumour samples as the largest published study to date [12]. This is also the first time this standardised H&E visual assessment method of TIL evaluation has been used in ovarian tumours. We have shown that TILs as assessed by stromal lymphocyte levels correlate with clinical variables such as tumour histological subtype. However, intratumoral TILs did not. We have also shown that increased levels of both intratumoral and stromal TILs are associated with a better prognosis; however, this is only statistically significant for intratumoral TILs. These results add weight to the argument that the immune system plays an important role in ovarian cancer. They also support the idea that different subtypes of ovarian cancer are variably immunogenic and that the immune response can help define different subtypes. The difference between stromal and intratumoral TIL effects, despite their correlated levels in both primary and secondary tumours, is interesting, and warrants further investigation. The greater prognostic effect of intratumoral TILs may explained by the biological rationale that T-cell activation necessitates physical contact with target cells in order to engage the T cell receptor [26]. In contrast, the lesser prognostic effect of stromal TILs might be explained in two ways; either they are in-transit to tumour cells hence will eventually become intratumoral TILs, or that they have been excluded from the tumour microenvironment by factors secreted by tumour cells and/or other stromal cells, as a means of evading immune attack [26]. Further work to elucidate the distinct roles of intratumoral and stromal TILs is needed. The results suggest that a clinically useful immune prognostic indicator in epithelial ovarian cancer could
7 James et al. BMC Cancer (2017) 17:657 Page 7 of 7 be developed using this technique, but larger scale studies are needed to replicate these results. Thus, further studies evaluating the potential of TILs as predictors of treatment response are warranted. Conclusion This study is the largest collection of epithelial ovarian tumour samples evaluated for TILs. We have shown that stromal and intratumoral TIL levels are correlated and that their levels correlate with clinical variables such as tumour histological subtype. We have also shown that increased levels of both intratumoral and stromal TILs are associated with a better prognosis; however, this is only statistically significant for intratumoral TILs. This study suggests that a clinically useful immune prognostic indicator in epithelial ovarian cancer could be developed using this technique. Abbreviations H&E: Hematoxylin and eosin; ITL: Intratumoral lymphocytes; SL: Stromal lymphocytes; TILs: Tumour infiltrating lymphocytes Acknowledgements We thank all the patients who contributed to this study and the SEARCH team for patient recruitment and the staff of the National Cancer Registration Service East for providing access to patient clinical data. Funding This study was funded by Cancer Research UK (C490/A16561). The funders of this project had no role in the design of the study and collection, analysis, and interpretation of data and in writing the manuscript. Availability of data and materials The data presented in this manuscript are available at. Authors contributions Project conception and design: HRA, JDB and PDPP. Pathology review: HRA and MJ-L. Processing of pathology material and generation of pathology data: JA, HS and MM. Management of the SEARCH clinical database: HS. Data analysis: FRJ and PDPP. Drafting of the manuscript: FRJ, HRA and PDPP. All authors reviewed and approved the final version of the manuscript. Ethics approval and consent to participate SEARCH is approved by the Cambridgeshire 4 Research Ethics Committee. All participants provided written informed consent. Consent for publication Not applicable. Competing interests The authors declare that they have no competing interests. Publisher s Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. Author details 1 Lancashire Teaching Hospitals Foundation NHS Trust, Lancashire, UK. 2 Department of Pathology, University of Cambridge, Cambridge, UK. 3 Department of Oncology, University of Cambridge, Cambridge, UK. 4 Department of Oncology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK. 5 Department of Pathology, CRUK Cambridge Institute, University of Cambridge, Cambridge, UK. Received: 5 March 2017 Accepted: 22 August 2017 References 1. Jemal A, et al. 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