<prompt> In the Clatke;s level of tumor invasion for malignant melanoma level 3 refers toAll tumar cells above basement membraneInvasion into reticular dermisInvasion into loose connective tissue of papillary dermisTumor cells at junction of papillary and reticular dermis  <response>: .Staging of Malignant Melanoma It is older staging system IA: Thickness less than 0.75 mm. IB: Thickness between 0.76 to 1.5 mm. IIA: Thickness between 1.51 to 4.0 mm. IIB: Thickness more than 4.0 mm. IIIA: Any of the above nodes less than 3 cm. IIIB: Any of the above nodes more than 3 cm. IV: Any of the above any node M1 distant spread ref:SRB;s manual of surgery,ed 3,pg no 262 