Question: What makes telomerase a good drug target?

Context:
Human telomerase is absent in most normal tissues, but is abnormally activated in all major cancer cells. Telomerase enables tumor cells to maintain telomere length, allowing indefinite replicative capacity.
telomerase is believed to be necessary for cancer cells to grow without limit
 Telomerase, a ribonucleoprotein enzyme is considered as a universal therapeutic target of cancer because of its preferential expression in cancer cells and its presence in 90 % of tumors. 
Interestingly, almost 100 % of adenocarcinoma, including breast cancer cells, expresses telomerase which makes it a good target for telomerase-related therapy.
The observation that the enzyme telomerase is up-regulated in 80-90% of cancer cells isolated from primary human tumors but is absent in neighboring cells of healthy tissue has resulted in significant efforts to validate telomerase as an anticancer drug target and to develop effective approaches toward its inhibition.
Telomerase plays an important role in cell proliferation and carcinogenesis and is believed to be a good target for anti-cancer drugs.
In contrast to cancer cells, most normal human cells have no or low telomerase levels which makes it an attractive target for anti-cancer drugs.
Telomerase activity is repressed in normal human somatic cells, but is activated in most cancers, suggesting that telomerase may be an important target for cancer therapy.
Telomerase is expressed in more than 85% of cancer cells, making it a nearly universal cancer marker, while the majority of normal somatic cells are telomerase negative
The activity of telomerase is highly associated with carcinogenesis which makes the enzyme an attractive biomarker in cancer diagnosis and treatment
The human telomerase reverse transcriptase (hTERT) is expressed in more than 85% of tumor cells but is usually not found in normal cells, which makes hTERT as an ideal tumor-associate antigen (TAA) to develop potential vaccine specifically destroying cancers without impairing normal tissues in human cancer immunotherapy
The differential expression of telomerase in cancer cells makes it an attractive therapeutic target
The evidence that telomerase is also present in normal B cells at different levels according to their differentiation and activation state makes the study of telomerase activity in B cell tumors particularly interesting
Telomerase is up-regulated in the majority of cancer cells and is essential for their survival, making it a potential anti-cancer drug target. 
In contrast to cancer cells, most normal human cells have no or low telomerase levels which makes it an attractive target for anti-cancer drugs. 
As normal cells have a considerable telomere reserve, even in elderly humans, this makes telomerase an attractive and potentially selective anti-cancer drug target.
The expression of telomerase in approximately 85% of cancers and its absence in the majority of normal cells makes it an attractive target for cancer therapy.
Moreover, since telomerase is not or slightly expressed in normal cells, it has been postulated that drugs targeting telomerase would induce low toxicity.
Telomerase is expressed in most cancer cells, but not in normal somatic cells, suggesting that telomerase is an attractive target for cancer chemotherapy
elomerase, a special reverse transcriptase, has been recognized as a common factor in most tumor cells, and in turn a distinctive characteristic with respect to non-malignant cells
Telomerase is detected in the majority of prostate cancers, but not in normal or benign prostatic hyperplasia tissue.
The catalytic component of telomerase in humans, hTERT, is upregulated in nearly 90% of all cancers, making it the most widely expressed marker of malignancy. With the exception of germ cells and stem cells, hTERT is undetectable in somatic human tissues.
he notion that telomerase is reactivated in 80-90% of human cancers has led to the proposal of telomerase as a promising therapeutic target for novel anticancer interventions

Answer: Human telomerase is absent in most normal tissues, but is abnormally activated in all major cancer cells. Telomerase enables tumor cells to maintain telomere length, allowing indefinite replicative capacity.
Telomerase, a ribonucleoprotein enzyme is considered as a universal therapeutic target of cancer because of its preferential expression in cancer cells and its presence in 90 % of tumors. Human telomerase is absent in most normal tissues, but is abnormally activated in all major cancer cells.
 telomerase, a ribonucleoprotein enzyme is considered as a universal therapeutic target of cancer because of its preferential expression in cancer cells and its presence in 90 % of tumors.
Human telomerase is absent in most normal tissues, but is abnormally activated in all major cancer cells. Telomerase enables tumor cells to maintain telomere length, allowing indefinite replicative capacity. telomerase is believed to be necessary for cancer cells to grow without limit
 Telomerase, a ribonucleoprotein enzyme is considered as a universal therapeutic target of cancer because of its preferential expression in cancer cells and its presence in 90 % of tumors.