Medical sector stocks delivered strong gains in 2014. Among the stocks in this week’s Big Cap 20, medical-related issues gained 16% to 67% last year. Are any of these stocks poised to deliver further price gains in 2015, or are these stocks spent? Let’s look at three with bases that aren’t late stage. The stock of San Diego-based gene sequencing company Illumina (ILMN) rose 67% in 2014.