Acknowledging that what follows is akin to a playwright reviewing his own production, your correspondent will now recount a journalistic excursion through the minefields of medical orthodoxy.I recently wrote an article in the Columbia University Journalism Review (January/February, 1975), "A Critical Look at Cancer Coverage," reprinted in the Washington Post (January 19), the thrust of it being that the lay press is unduly gullible in reporting "progress" in cancer treatment. The basis for this contention was that cancer survival rates, as reported by the National Cancer Institute (NCI), have shown little improvement over the past two decades or so, . . .