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Frontiers of Medicine

ISSN 2095-0217

ISSN 2095-0225(Online)

CN 11-5983/R

Postal Subscription Code 80-967

2018 Impact Factor: 1.847

Front. Med.    2022, Vol. 16 Issue (6) : 957-968    https://doi.org/10.1007/s11684-021-0910-1
RESEARCH ARTICLE
Risk stratification system for skin and soft tissue infections after allogeneic hematopoietic stem cell transplantation: PAH risk score
Shan Chong, Yun He, Yejun Wu, Peng Zhao, Xiaolu Zhu, Fengrong Wang, Yuanyuan Zhang, Xiaodong Mo, Wei Han, Jingzhi Wang, Yu Wang, Huan Chen, Yuhong Chen, Xiangyu Zhao, Yingjun Chang, Lanping Xu, Kaiyan Liu, Xiaojun Huang, Xiaohui Zhang()
Peking University People’s Hospital, Peking University Institute of Hematology, Beijing 100044, China; Collaborative Innovation Center of Hematology, Peking University, Beijing 100044, China; Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing 100044, China; National Clinical Research Center for Hematologic Disease, Beijing 100044, China
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Abstract

Skin and soft tissue infections (SSTIs) refer to infections involving the skin, subcutaneous tissue, fascia, and muscle. In transplant populations with hematological malignancies, an immunocompromised status and the routine use of immunosuppressants increase the risk of SSTIs greatly. However, to date, the profiles and clinical outcomes of SSTIs in hematopoietic stem cell transplantation (HSCT) patients remain unclear. This study included 228 patients (3.67%) who developed SSTIs within 180 days after allogeneic HSCT from January 2004 to December 2019 in Peking University People’s Hospital. The overall annual survival rate was 71.5%. We compared the differences between survivors and non-survivors a year after transplant and found that primary platelet graft failure (PPGF), comorbidities of acute kidney injury (AKI), and hospital-acquired pneumonia (HAP) were independent risk factors for death in the study population. A PPGF–AKI–HAP risk stratification system was established with a mortality risk score of 1×PPGF+1×AKI+1×HAP. The areas under the curves of internal and external validation were 0.833 (95% CI 0.760–0.906) and 0.826 (95% CI 0.715–0.937), respectively. The calibration plot revealed the high consistency of the estimated risks, and decision curve analysis showed considerable net benefits for patients.

Keywords skin and soft tissue infections      hematopoietic stem cell transplantation      risk stratification system      mortality     
Corresponding Author(s): Xiaohui Zhang   
Just Accepted Date: 15 June 2022   Online First Date: 03 November 2022    Issue Date: 16 January 2023
 Cite this article:   
Shan Chong,Yun He,Yejun Wu, et al. Risk stratification system for skin and soft tissue infections after allogeneic hematopoietic stem cell transplantation: PAH risk score[J]. Front. Med., 2022, 16(6): 957-968.
 URL:  
https://academic.hep.com.cn/fmd/EN/10.1007/s11684-021-0910-1
https://academic.hep.com.cn/fmd/EN/Y2022/V16/I6/957
Fig.1  Flow chart of the study population selection.
ICD diagnosis ICD code No. of patients (%)
Anogenital herpesvirus (herpes simplex) infection A60.XXX 3 (1.3)
Viral infections characterized by skin and mucous membrane lesions B00.XXX–B09.XXX 20 (8.8)
Dermatophytosis B35.XXX 2 (0.88)
Candidiasis of skin and nail B37.201 2 (0.88)
Anal abscess K61.002 13 (5.7)
Perianal infection K62.805 22 (9.6)
Cutaneous abscess, furuncle, and carbuncle L02.XXX 4 (1.8)
Cellulitis L03.XXX 13 (5.7)
Other local infections of skin and subcutaneous tissue L08.XXX 110 (48.2)
Decubitus ulcer L89.XXX 3 (1.3)
Gangrene R02.XXX 1 (0.4)
Infection and inflammatory reaction due to vascular devices T82.703 28 (12.3)
Infection following a procedure, not elsewhere classified T81.XXX 2 (0.88)
Tab.1  ICD-10 diagnosis and code of SSTIs in allo-HSCT recipients
Characteristics Survivors Non-survivors P
No. of patients 167 61
Gender, n (%) 0.980
Male 118 (70.7%) 43 (70.5%)
Female 49 (29.3%) 18 (29.5%)
Age (diagnosed with pneumonia), year, mean ± SD 32.68 ± 13.733 38.28 ± 12.731 0.006*
Underlying diseases, n (%) 0.467
AML 53 (31.7%) 16 (26.2%)
ALL 71 (42.5%) 27 (44.3%)
CML 9 (5.4%) 1 (1.6%)
MDS 27 (16.2%) 11 (18.0%)
NHL 2 (1.2%) 2 (3.3%)
Others 5 (3.0%) 4 (6.6%)
HCT-CI, n (%) 0.316
0 130 (77.8%) 46 (75.4%)
1 29 (17.4%) 8 (13.1%)
2 6 (3.6%) 6 (9.8%)
3 2 (1.2%) 1 (1.6%)
Median time from diagnosis to HSCT, month (range) 6 (2–144) 6 (2–240) 0.863
Disease status, n (%) 0.032*
CR 137 (82.0%) 42 (68.9%)
Advanced disease 30 (18.0%) 19 (31.1%)
Donor, n (%) 0.232
MRD 4 (2.4%) 2 (3.3%)
MUD 43 (25.7%) 15 (24.6%)
HID 119 (71.3%) 41 (67.2%)
CB 1 (0.6%) 3 (4.9%)
Gender relationship, n (%) 0.874
M−M 78 (46.7%) 33 (54.1%)
M−F 38 (22.8%) 11 (18.0%)
F−M 37 (22.2%) 12 (19.7%)
F−F 14 (8.4%) 5 (8.2%)
ABO compatibility, n (%) 0.467
Match 102 (61.1%) 34 (55.7%)
Mismatch 66 (38.9%) 27 (44.3%)
HLA compatibility, n (%) 0.433
Match 47 (28.1%) 17 (23.0%)
Haplo-identical 120 (71.9%) 44 (77.0%)
Graft source 0.149
BM + PB 158 (94.6%) 56 (91.8%)
BM 2 (1.2%) 0
PB 6 (3.6%) 2 (3.3%)
CB 1 (0.6%) 3 (4.9%)
MNCs ( × 108/kg, mean ± SD) 8.21 ± 1.67 8.04 ± 1.72 0.481
CD34+( × 106/kg, mean ± SD) 2.67 ± 1.37 2.79 ± 1.46 0.558
Median WBC engraftment time, day (range)a 14 (10–28) 14 (9–23) 0.361
Median PLT engraftment time, day (range)b 16 (6–170) 15 (10–153) 0.684
Antecedent aGVHD, n (%) 0.040*
None 151 (90.4%) 47 (77.0%)
I–II 11 (6.6%) 9 (14.8%)
III–IV 5 (3.0%) 5 (8.2%)
Antecedent cGVHD, n (%) 3 (1.8%) 3 (4.9%) 0.403
Antecedent CMV viremia 27 (16.2%) 14 (23%) 0.238
Antecedent EBV viremia 4 (2.4%) 2 (3.3%) 0.718
Tab.2  Baseline characteristics of surviving and dead allo-HSCT patients with SSTI
Locations of SSTIs No. of patients (%)
Maxillofacial infection 47 (20.6%)
Infection due to vascular devices 41 (18.0%)
Anal infection 40 (17.5%)
Lower limbs infection 29 (12.7%)
Upper limbs infection 11 (4.8%)
Back infection 11 (4.8%)
External genital infection 9 (3.9%)
Front trunk infection 9 (3.9%)
Hip infection 8 (3.5%)
Hands infection 8 (3.5%)
Feet infection 8 (3.5%)
Neck infection 3 (1.3%)
Perineum infection 2 (0.9%)
Multiple systemic infections 2 (0.9%)
Tab.3  Anatomic profiles of SSTIs in patients following allo-HSCT
Features Univariate Multivariate
OR 95% CI P OR 95% CI P
Age > 60 years 0.897 0.091–8.862 0.926
Disease status 1.852 0.832–4.118 0.131
History of diabetes mellitus, n (%) 3.565 1.125–11.298 0.031* 4.250 0.914–19.766 0.065
ABO matched 1.189 0.588–2.403 0.630
HLA matched 1.146 0.489–2.686 0.754
Primary platelet graft failure 24.348 7.606–77.941 < 0.001* 11.726 3.202–42.941 < 0.001*
CMV viremia 1.244 0.497–3.116 0.641
EBV viremia 2.227 0.582–8.911 0.237
aGVHD 1.960 0.877–4.382 0.101 1.216 0.474–3.120 0.685
cGVHD 5.610 0.495–63.516 0.164
SSTIs at multiple locations 0.940 0.317–2.788 0.911
Complicated SSTIs 2.135 0.457–9.965 0.335
Hospital-acquired pneumonia 11.667 5.140–26.479 < 0.001* 5.765 2.223–14.952 < 0.001*
Hepatic failure 19.594 4.130–92.947 < 0.001* 6.116 0.858–43.594 0.071
Acute kidney injury 12.948 3.405–49.230 < 0.001* 9.948 2.040–48.512 0.004*
Tab.4  Risk factors of the death of HSCT recipients with SSTI in the derivation cohort
Variables Multivariable analysis Point
OR (95% CI) P   Coefficients
Primary platelet graft failure 9.849 (3.293–29.459) < 0.001   2.462 1
Acute kidney injury 10.618 (3.093–36.455) 0.004   2.397 1
Hospital-acquired pneumonia 6.654 (3.015–14.682) < 0.001   1.752 1
Tab.5  Coefficients and points for the PAH risk stratification system for SSTIs in allo-HSCT recipients by using independent variables in the derivation cohort
Derivation cohort (n = 159) Validation cohort (n = 69)
Low Intermediate High Low Intermediate High
Risk score 0 1 2–3 0 1 2–3
Survivor 97 17 3 43 7 1
Non-survivor 9 15 19 4 9 5
Mortality 8.5% 46.9% 86.4% 8.5% 56.3% 83.3%
Tab.6  Mortality of allo-HSCT recipients with SSTIs in derivation and validation cohorts
Fig.2  Receiver operating characteristic (ROC) curve of the PAH risk stratification system in the derivation and validation cohorts. (A) ROC curve of the PAH risk stratification system for the derivation cohort. The area under the curve (AUC) was 0.833 (95% CI 0.760–0.906). (B) ROC curve of the PAH risk stratification system for the validation cohort. The AUC was 0.826 (95% CI 0.715–0.937).
Fig.3  Calibration plot of the PAH risk stratification system in the derivation and validation cohorts. (A) Calibration plot of the PAH risk stratification system for the derivation cohort. (B) Calibration plot of the PAH risk stratification system for the validation cohort. The x-axis plots the predicted one-year mortality of allo-HSCT recipients with SSTIs; the y-axis plots the observed one-year mortality in our study. The 45° diagonal line stands for the ideal calibration plot.
Fig.4  Decision curve analysis of the PAH stratification system in derivation and validation cohorts. (A) Decision curve analysis of the PAH risk stratification system for the derivation cohort. (B) Decision curve analysis of the PAH risk stratification system for the validation cohort. Black line: assuming no patient died within one year. Gray line: assuming all patients died within one year. The two lines serve as references.
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