PRTC stock closed at $19.1 on January 31, 2025, up 2.91% during regular trading, but dropped to $18.7304 in after-hours trading. The bullish view stems from FDA Fast Track designation for its LYT-200 drug, which could expedite its development for acute myeloid leukemia, a significant market opportunity. However, the after-hours dip suggests caution, with $19.1 as a key resistance level to watch.