Thymidylate synthase protein expression levels remain stable during paclitaxel and carboplatin treatment in non-small cell lung cancer

TY - JOUR

T1 - Thymidylate synthase protein expression levels remain stable during paclitaxel and carboplatin treatment in non-small cell lung cancer

AU - Jakobsen, Jan Nyrop

AU - Santoni-Rugiu, Eric

AU - Sørensen, Jens Benn

PY - 2014/4

Y1 - 2014/4

N2 - Background: Thymidylate synthase (TS) is a potential predictive marker for efficacy of treatment with pemetrexed. The current study aimed at investigating whether TS expression changes during non-pemetrexed chemotherapy of non-small cell lung cancer (NSCLC), thus making rebiopsy necessary for deciding on pemetrexed second-line treatment. Materials and methods: TS immunohistochemístry was performed on biopsies and available resection specimens from 65 NSCLC patients stage T1-3N0-2 treated with preoperative carboplatin and paclitaxel [neoadjuvant chemotherapy (NAC)-group] and from 53 NSCLC patients stage T1-4N0-1 treated with surgery without preceding chemotherapy [operation (OP)-group] that served as controls. The diagnostic biopsies and subsequent resection samples were compared in order to evaluate for change in TS expression in groups treated with and without preoperative chemotherapy. Results: No statistically significant change in TS expression was observed between diagnostic biopsies and subsequent surgical resections of primary tumors in either the OP-group (p = 0.186) or the NAC-group (p = 0.542). Primary tumors were discordant between diagnostic biopsies and resection specimens when TS expression was dichotomized into high (H score ≥ 150) and low (H score < 150), in 45 and 33 % in the OP-group and NAC-group, respectively (p = 0.288). The fraction of tumors which increased (19 vs. 20 %; p = 0.900) and decreased (42 vs. 23 %; p = 0.095) in TS expression was equal between the OP- and the NAC-group. Conclusion: The discordance observed between paired serial samples likely reflects intratumoral heterogeneity of TS expression and highlights the need of sufficient representative material for TS expression analysis if this biomarker is to be used for treatment selection. TS expression in primary tumors remained unchanged, and new biopsies for deciding on second-line pemetrexed does not seem warranted based on the current results.

AB - Background: Thymidylate synthase (TS) is a potential predictive marker for efficacy of treatment with pemetrexed. The current study aimed at investigating whether TS expression changes during non-pemetrexed chemotherapy of non-small cell lung cancer (NSCLC), thus making rebiopsy necessary for deciding on pemetrexed second-line treatment. Materials and methods: TS immunohistochemístry was performed on biopsies and available resection specimens from 65 NSCLC patients stage T1-3N0-2 treated with preoperative carboplatin and paclitaxel [neoadjuvant chemotherapy (NAC)-group] and from 53 NSCLC patients stage T1-4N0-1 treated with surgery without preceding chemotherapy [operation (OP)-group] that served as controls. The diagnostic biopsies and subsequent resection samples were compared in order to evaluate for change in TS expression in groups treated with and without preoperative chemotherapy. Results: No statistically significant change in TS expression was observed between diagnostic biopsies and subsequent surgical resections of primary tumors in either the OP-group (p = 0.186) or the NAC-group (p = 0.542). Primary tumors were discordant between diagnostic biopsies and resection specimens when TS expression was dichotomized into high (H score ≥ 150) and low (H score < 150), in 45 and 33 % in the OP-group and NAC-group, respectively (p = 0.288). The fraction of tumors which increased (19 vs. 20 %; p = 0.900) and decreased (42 vs. 23 %; p = 0.095) in TS expression was equal between the OP- and the NAC-group. Conclusion: The discordance observed between paired serial samples likely reflects intratumoral heterogeneity of TS expression and highlights the need of sufficient representative material for TS expression analysis if this biomarker is to be used for treatment selection. TS expression in primary tumors remained unchanged, and new biopsies for deciding on second-line pemetrexed does not seem warranted based on the current results.

KW - Adenocarcinoma

KW - Adult

KW - Aged

KW - Antineoplastic Combined Chemotherapy Protocols

KW - Carboplatin

KW - Carcinoma, Non-Small-Cell Lung

KW - Carcinoma, Squamous Cell

KW - Case-Control Studies

KW - Female

KW - Follow-Up Studies

KW - Humans

KW - Lung Neoplasms

KW - Male

KW - Middle Aged

KW - Neoplasm Staging

KW - Paclitaxel

KW - Prognosis

KW - Randomized Controlled Trials as Topic

KW - Survival Rate

KW - Thymidylate Synthase

KW - Tumor Markers, Biological

U2 - 10.1007/s00432-014-1614-6

DO - 10.1007/s00432-014-1614-6

M3 - Journal article

C2 - 24562672

SN - 0171-5216

VL - 140

SP - 645

EP - 652

JO - Zeitschrift fur Krebsforschung

JF - Zeitschrift fur Krebsforschung

IS - 4

ER -