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Gemcitabine has high activity against nasopharyngeal carcinoma(NPC).The level of ribonucleotide reductase subunit M1(RRM1) expression is closely related to the efficacy of gemcitabine on non-small cell lung cancer and pancreatic cancer.However,the expression of RRM1 and its association with sensitivity to gemcitabine-based chemotherapy in advanced NPC is not known.In this study,we retrospectively collected 48 formalin-fixed,paraffin-embedded NPC tissues to evaluate the expression of RRM1 using immunohistochemistry.All patients were diagnosed and treated with gemcitabine-based chemotherapy at Sun Yat-sen University Cancer Center.RRM1 expression was positive in 17(35%) patients.RRM1 expression was not associated with sex,age,performance status,WHO histological type,number of distant metastases,previous treatment,or cycles of gemcitabine-based chemotherapy(P> 0.05).The progression-free survival of the RRM1-positive group was shorter than that of the RRM1-negative group(5 months vs.7 months,P = 0.036),and the response rate of the RRM1-positive group was somewhat lower than that of the RRM1-negative group(51.6% vs.35.3%,P = 0.278).There was no significant difference in median survival between the RRM1-positive and RRM1-negative groups(22 months vs.19 months,P = 0.540).Our results show that RRM1-negative expression is related with longer progression-free survival in advanced NPC patients treated with gemcitabine-based regimens.
Gemcitabine has high activity against nasopharyngeal carcinoma (NPC). The level of ribonucleotide reductase subunit M1 (RRM1) expression is closely related to the efficacy of gemcitabine on non-small cell lung cancer and pancreatic cancer. However, the expression of RRM1 and its association with sensitivity to gemcitabine-based chemotherapy in advanced NPCs is not known. this study, we retrospectively collected 48 in-fixed, paraffin-embedded NPC tissues to evaluate the expression of RRM1 using immunohistochemistry. All patients were diagnosed and treated with gemcitabine-based chemotherapy at Sun Yat-sen University Cancer Center. The RRM1 expression was positive in 17 (35%) patients. RRM1 expression was not associated with sex, age, performance status, WHO histological type, number of distant metastases, previous treatment, or cycles of The progression-free survival of the RRM1-positive group was shorter than that of the RRM1-negative group (5 months vs.7 month s, P = 0.036), and the response rate of the RRM1-positive group was somewhat lower than that of the RRM1-negative group (51.6% vs.35.3%, P = 0.278) the results show that RRM1-negative expression is related with longer progression-free survival in advanced NPC patients treated with gemcitabine-based regimens.