Indicate true (T) and false (F) statements below regarding cell proliferation in human somatic cancer cells. Your answer would be a four-letter string composed of letters T and F only, e.g. TFFF.
( ) Cancer cells show replicative cell senescence.
( ) Cancer cells maintain their telomeres by inhibiting the enzyme telomerase.
( ) Some cancer cells do not rely on telomerase for telomere lengthening.
( ) Most cancer cells lack telomeres.