the hospital systems in the boston area are at the top of the list as far as prestigous teaching hospitals are concerned. They don't care about some lab rep from a low rent cheaply run organization. They do what they want and keep most of the work in house. Labcorp has no name or presence in the New England states either.
Do your homework. They will misrepresent the job and the potential. There are no relationships and nothing in the pipeline. Be prepared to get your balls stomped.