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Clinical characteristics and outcomes of follicular lymphoma patients with extranodal involvement: analysis of a series of 1090 cases in China

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Abstract

Background

Follicular lymphoma (FL) is the most common indolent B cell lymphoma in the world. The clinical features of extranodal involvement in FL were never extensively described.

Methods

We enrolled 1090 patients diagnosed as newly diagnosed FL at ten medical institutions in China from 2000 to 2020 and conducted this analysis and retrospectively explored clinical characteristics and outcomes of FL patients with extranodal involvement.

Results

400 (36.7%) patients with newly diagnosed FL had no extranodal involvement, 388 (35.6%) patients had one site of extranodal involvement, and 302 (27.7%) had two or more sites of involvement. Patients with >1 extranodal site had significantly worse PFS (p<0.001), as well as OS (p=0.010). The most common site of extranodal involvements was bone marrow (33%), followed by spleen (27.7%) and intestine (6.7%). In patients with extranodal involvement, multivariate Cox analysis found that male patients (p=0.016), poor performance status (p=0.035), increased LDH (p<0.001) and pancreas involvement (p<0.001) was associated with poor PFS, while the latter three factors were also associated with poor OS. Compared to patients with one site of extranodal involvement, patients with >1 site involvement (p=0.012) had 2.04-fold risk to develop POD24. In addition, multivariate Cox analysis found that the usage of rituximab was not associated with better PFS (p=0.787) or OS (p=0.191).

Conclusions

Our cohort is large enough to have statistical significance in FL patients with extranodal involvement. Male sex, increased LDH, poor performance status, >1 extranodal site, as well as pancreas involvement indicated useful prognostic factors in the clinical setting.

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Data availability

All relevant data and materials have been involved in the article. Further inquiries can be directed to the corresponding authors.

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Acknowledgements

We thank Chinese Workshop on Follicualr lymphoma. Especially, we also thank Prof. Tongyu Lin (Sichuan cancer hospital) for his kind supervision and support in designing and conducting this study.

Funding

This work was financially supported by the National Natural Science Foundation of China (82170180 granted for Bing Xu, 81800163 granted for Jie Zha, 81800196 and 81770161 granted for Zhiming Li), the Natural Science Foundation of Fujian Province (2020J011246 granted for Bing Xu, 2020GGB054 granted for Zhifeng Li), Xiamen Municipal Bureau of Science and Technology (3502Z20209003 granted for Bing Xu, 3502Z20209008 granted for Zhifeng Li) and Lymphoma Research Fund of Chinese Anti-Cancer Association (CORP-117 granted for Bing Xu).

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Authors

Contributions

ZJL, ZFL, BX: took part in conception and design. ZJL, JZ, SHY, ZFL, LYP, XHH: involved in research performance. SHY, ZFL, LYP, XHH, LYF, HFY, ZZ, WX, FLC, YX, BYC, HLZ, WL, KYD, WYL, HYY, WLZ, LGQ, ZML, YQS, BX: took part in collection and assembly of clinical data. ZJL, JZ, BX: participated in data analysis and interpretation. ZJL, JZ and BX: involved in manuscript writing. ZJL, ZFL, ZML, YQS, BX: participated in study supervision. All authors read and approved the final manuscript.

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Correspondence to Zhiming Li, Yuqin Song or Bing Xu.

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Lin, Z., Zha, J., Yi, S. et al. Clinical characteristics and outcomes of follicular lymphoma patients with extranodal involvement: analysis of a series of 1090 cases in China. Clin Transl Oncol 25, 1821–1829 (2023). https://doi.org/10.1007/s12094-023-03081-0

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