Prognostic and Clinical Value of the Systemic Immune-Inflammation Index in Biliary Tract Cancer: A Meta-Analysis
Xiulan Peng, Xia Wang, Hua Li, Rui Yang
Abstract
Previous studies that explored the prognostic and clinical value of the systemic immune-inflammation index (SII) in biliary tract cancer (BTC) had inconsistent results. We conducted this meta-analysis to evaluate the prognostic and clinicopathological role of the SII in biliary tract cancer. Combined analysis demonstrated that high SII levels had worse overall survival ( <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" id="M1"> <a:mtext>HR</a:mtext> <a:mo>=</a:mo> <a:mn>1.92</a:mn> </a:math> , 95% CI: 1.66–2.21, <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" id="M2"> <c:mi>p</c:mi> <c:mo><</c:mo> <c:mn>0.001</c:mn> </c:math> ) than those with low SII levels. And an elevated SII was associated with lymph node metastasis ( <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" id="M3"> <e:mtext>OR</e:mtext> <e:mo>=</e:mo> <e:mn>1.44</e:mn> </e:math> , 95% <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" id="M4"> <g:mtext>CI</g:mtext> <g:mo>=</g:mo> <g:mn>1.18</g:mn> <g:mo>‐</g:mo> <g:mn>1.76</g:mn> </g:math> ; <i:math xmlns:i="http://www.w3.org/1998/Math/MathML" id="M5"> <i:mi>p</i:mi> <i:mo><</i:mo> <i:mn>0.001</i:mn> </i:math> ), TNM stage ( <k:math xmlns:k="http://www.w3.org/1998/Math/MathML" id="M6"> <k:mtext>OR</k:mtext> <k:mo>=</k:mo> <k:mn>1.49</k:mn> </k:math> , 95% <m:math xmlns:m="http://www.w3.org/1998/Math/MathML" id="M7"> <m:mtext>CI</m:mtext> <m:mo>=</m:mo> <m:mn>1.05</m:mn> <m:mo>‐</m:mo> <m:mn>2.13</m:mn> </m:math> ; <o:math xmlns:o="http://www.w3.org/1998/Math/MathML" id="M8"> <o:mi>p</o:mi> <o:mo>=</o:mo> <o:mn>0.028</o:mn> </o:math> ), and vascular invasion ( <q:math xmlns:q="http://www.w3.org/1998/Math/MathML" id="M9"> <q:mtext>OR</q:mtext> <q:mo>=</q:mo> <q:mn>1.49</q:mn> </q:math> , 95% <s:math xmlns:s="http://www.w3.org/1998/Math/MathML" id="M10"> <s:mtext>CI</s:mtext> <s:mo>=</s:mo> <s:mn>1.05</s:mn> <s:mo>‐</s:mo> <s:mn>2.13</s:mn> </s:math> ; <u:math xmlns:u="http://www.w3.org/1998/Math/MathML" id="M11"> <u:mi>p</u:mi> <u:mo>=</u:mo> <u:mn>0.028</u:mn> </u:math> ). Conversely, no significant association between a high SII and sex or tumor differentiation was found. Our findings demonstrate that high SII levels were correlated with unfavorable survival outcomes among patients with BTC and that they were also correlated with some higher malignancy features of BTC.