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[Sequential Treatment of Advanced Squamous Lung Cancer:  First-line Gemcitabine +/- platinum Followed by Second-line Taxanes +/- platinum Versus Reverse Sequence].

BACKGROUND AND OBJECTIVE
Gemcitabine and taxanes are effective agents commonly used in advanced squamous lung cancer. The best treatment sequence, however, is unclear to our knowledge. So we conducted this retrospective study in order to compare the efficacy and toxicities of first-line Gemcitabine +/- platinum followed by second-line taxanes +/- platinum with the reverse sequence.


METHODS
We totally analyzed 105 patients with stage IIIb-IV squamous lung cancer in our retrospective study. There were 49 patients receiving gemcitabine +/- platinum first-line followed by taxanes +/- platinum second-line (G-T group), and 56 patients receiving taxanes +/- platinum first-line followed by gemcitabine +/- platinum second-line (T-G group). The primary endpoint of the study was overall survival (OS), and the secondary endpoints included progression-free survival (PFS), objective response rate (ORR), disease control rate (DCR) and toxicities.


RESULTS
The median OS were 18.5 mo in G-T group and 19.0 mo in T-G group (P=0.520). The median PFS1 was 5.0 mo and 4.0 mo with first-line gemcitabine +/- platinum and taxanes +/- platinum, respectively (P=0.584). The median PFS2 was 2.7 mo and 2.5 mo with second-line gemcitabine +/- platinum and taxanes +/- platinum (P=0.432). The ORR1 of G-T group and T-G group were 36.73% and 33.92% (P=0.577), and DCR1 were 79.59% and 89.29% (P=0.186); the ORR2 of G-T group and T-G group were 4.08% and 5.36% (P=0.085), and DCR2 were 51.02% and 66.07%, respectively (P=0.118). Hematologic toxicities was more frequent in G-T group, the patients experienced more grade 3-4 lower hemoglobin (P=0.027) and thrombocytopenia (P=0.002).


CONCLUSIONS
The efficacy of first line gemcitabine +/- platinum followed by second line taxanes +/- platinum and the reverse sequence was similar, and the toxicities was tolerable. Both sequential patterns were effective in advanced squamous lung cancer. .