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Pretreatment Platelet Count and Neutrophil/Lymphocyte Ratio Are Predictive Markers for Carboplatin Plus Pemetrexed
Masaya Takahashi1, Katsuyuki Takahashi2, Hiroyasu Kaneda3
1Department of Pharmacy, Osaka City University Hospital, Osaka, Japan.
Background/Aim:
This study aimed to identify the predictive markers for carboplatin-induced severe thrombocytopenia.
Patients And Methods:
We conducted a retrospective cohort analysis of inpatients who received carboplatin and pemetrexed.
Results:
Among the 106 eligible patients, the incidence rate of grade ≥3 thrombocytopenia was 29.2% (31/106). Multivariate analysis revealed that grade ≥3 thrombocytopenia was associated with platelet count ≤26.6×104/mm3 [odds ratio (OR)=24.70, 95% confidence interval (CI)=5.75-106.00; p<0.001], neutrophil/lymphocyte ratio (NLR) >2.856 (OR=15.10, 95%CI=2.89-78.60; p=0.0013) and prognostic nutritional index ≤42.511 (OR=6.25, 95%CI=1.53-25.60; p=0.011). In particular, patients with both platelet counts ≤26.6×104/mm3 and NLR >2.856 presented with significantly higher frequencies of thrombocytopenia compared to those without these two factors [23/34 patients (67.6%) vs. 8/72 patients (11.1%), OR=16.1, 95%CI=5.40-53.6; p<0.001].
Conclusion:
Platelet counts ≤26.6×104/mm3 and NLR >2.856 are predictive markers for carboplatin-induced thrombocytopenia.
