Introduction

Predicting outcomes for patients with diffuse large B-cell lymphoma (DLBCL) remains a significant clinical challenge. Recent research highlights the importance of hematological ratios in assessing patient risk. Specifically, a new study has identified a unique U-shaped association regarding RPR in DLBCL prognosis for those receiving rituximab-based therapy. This finding suggests that both exceptionally low and high ratios may signal a poorer outlook.

The Study and RPR in DLBCL Prognosis

Researchers retrospectively analyzed data from 170 newly diagnosed DLBCL patients. These individuals were treated with rituximab-based regimens. The study focused on the red cell distribution width to platelet count ratio (RPR). Patients were categorized into three tertiles based on their RPR levels: Tertile 1 (<0.048), Tertile 2 (0.048-0.066), and Tertile 3 (>0.066). The results revealed that patients in the first and third tertiles experienced significantly worse progression-free survival (PFS) compared to those in the middle group.

Statistical modeling confirmed a nonlinear, U-shaped relationship. The inflection point for this association was identified at an RPR level of 0.051. On the left side of this point, lower RPR values were linked to higher risk. Conversely, on the right side, increasing RPR levels also correlated with a higher risk of disease progression or death. Therefore, maintaining an RPR near the median range appears optimal for better clinical outcomes.

Clinical Implications for Hematologists

The RPR is a cost-effective and easily accessible biomarker. Because it uses standard complete blood count data, clinicians can integrate it into routine practice without additional expenses. While traditional prognostic indices like the IPI remain vital, incorporating the RPR may offer more granular risk stratification. This allows for closer monitoring of patients who fall into the high-risk RPR categories.

Frequently Asked Questions

What is the RPR in DLBCL prognosis?

The RPR stands for the red cell distribution width to platelet count ratio. It serves as an inflammatory and nutritional marker that helps predict the survival and progression-free outcomes of DLBCL patients.

Why is the association between RPR and DLBCL prognosis U-shaped?

A U-shaped association means that both very low and very high RPR levels are associated with a higher risk of poor prognosis. The study found that patients with extreme RPR values had worse survival rates than those with intermediate levels.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or a substitute for professional healthcare. Consult a qualified medical professional for diagnosis and treatment. Refer to the latest local and national guidelines for clinical practice.

References

Pan J et al. U-shaped association of red cell distribution width to platelet count ratio and prognosis in diffuse large B-cell lymphoma treated with rituximab-based therapy. Hematology. 2026 Dec undefined. doi: 10.1080/16078454.2026.2641920. PMID: 41844530.

Li M, Xia H, Zheng H, et al. Red blood cell distribution width and platelet counts are independent prognostic factors and improve the predictive ability of IPI in diffuse large B-cell lymphoma. BMC Cancer. 2019;19:856. doi: 10.1186/s12885-019-6065-z.

Wang L, et al. Correlation between red blood cell distribution width/platelet count and prognosis of newly diagnosed diffuse large B-cell lymphoma. Blood Research. 2023;58(4):185-192.