Heterogeneity between subgroups of first-line chemoimmunotherapy for extensive-stage small cell lung cancer patients: a meta-analysis and systematic review.

Non-smokers, Asians, patients without liver metastasis or with LDH ≤ UNL or using etoposide-cisplatin were observed to tend to achieve longer OS from chemoimmunotherapy, although these findings did not reach statistical significance.

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