1)is it possible that you have lax les but no gerd? 2)suppose someone have gerd and his symptoms are almost gone ,is he still at the risk of getting cancer?

GERD by definition is the SYMPTOMATIC changes produced by reflux through the LES. The stomach is a muscular organ that squeezes to mix food preparing it for digestion. Many humans have some symptom free reflux. Avoiding laying down after feeds/caffeine & foods that aggravate reflux avoids symptoms. Cancer is rare in even those with decades of long-term GERD.