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Overall survival comparison of: (a) the three groups, (b) elderly, (c) EGFR‐mutation positive, and (d) the three EGFR‐mutation positive groups of patients. Blue, first‐line; green, second‐line; yellow, third‐line; blue line with dash, first‐line censored; green line with dash, second‐line censored; yellow line with dash, third‐line censored.
