I am a 6-year PhD student in computer engineering in an Asian country. My research field is Bioinformatics which was really hard to me in the beginning, but now, I love it and I have much experience at it.
Last year I was an intern in the bioinformatics department at a high-quality university in the United States. Since then, I have become disinterested in pursuing my PhD in computer engineering. Actually, most of the times I think of leaving my PhD and applying to a bioinformatics PhD program in the United States. However, I am worried if leaving my current PhD program in the 6th year will appear as a negative point on my CV when I am applying for a new PhD in bioinformatics.
If I leave my PhD, do I have any chance of getting admitted to a new PhD program in bioinformatics?
EDIT: Also, I am worried about the letters of recommendation. If I leave my current PhD program, of course I can't get any recommendation from my PhD supervisor.