Cells cultured from patients with this disorder exhibit low activity for the nucleotide excision repair process. This autosomal recessive genetic disease includes marked sensitivity to sunlight (Ultra voilet light) with subsequent formation of multiple skin cancers and premature death, the disorder is –
This patient has -


Defect in nucleotide excision repair 
Increased sensitivity to sunlight (photosensitivity)
Increased susceptibility to skin cancer
Premature death


All suggests the diagnosis of Xeroderma pigmentosa.
Acute intermittent porphyria
Alkaptonuria
Xeroderma pigmentosa
Ataxia - Telangiectasa