By Hester Plumridge 

LONDON-- AstraZeneca PLC fleshed out its stand-alone strategy Tuesday with ambitious new revenue targets, four days after turning down a $106 billion takeover bid from Pfizer Inc. that has ignited fierce U.K. political debate.

The U.K. drug maker, which said New York-based Pfizer's offer "substantially" undervalued its business, said Tuesday it was aiming to generate annual revenue of more than $45 billion by 2023, an 84% increase on the $25.71 billion it booked in 2013.

AstraZeneca also highlighted the potential value of its pipeline of cancer, asthma and diabetes drugs in development, forecasting the new drugs to generate peak annual sales of between $23 billion to $63 billion, depending on the proportion that might receive regulatory approval.

"The increasingly visible success of our independent strategy highlights the future prospects for our shareholders," said AstraZeneca Chairman Leif Johansson.

In a Friday interview with The Wall Street Journal, Chief Executive Pascal Soriot said AstraZeneca's pipeline was "underappreciated," highlighting 11 drugs in the final stages of clinical testing and a "very strong oncology franchise."

Valuing a drug company's pipeline is notoriously difficult. Pipeline drugs might be blocked by regulators or discontinued as ineffective; alternatively they could generate billions of dollars in annual sales.

Roughly a fifth of AstraZeneca's current valuation is based on estimated future sales of its pipeline drugs, estimates Credit Suisse, almost twice as high as the average for its European rivals including Sanofi, Novartis AG and Roche Holding AG.

New sales estimates AstraZeneca gave Tuesday for its pipeline drugs include up to $6.5 billion for its biggest hope: new cancer treatment MEDI4736, compared with analyst estimates of $2 billion to $7 billion cited by the company.

AstraZeneca also set out new revenue targets for its five growth areas. Annual revenue estimates for 2023 now include $3.5 billion from its blood-thinning pill Brilinta, $8 billion from its portfolio of diabetes drugs and $8 billion from respiratory drugs. The company said it expects mid-to-high-single-digit percentage revenue growth in emerging markets and low-single-digit revenue growth in Japan.

Analysts at Jefferies, a brokerage, said in a note to clients that the new business forecasts appeared "overly optimistic," particularly with regard to the updated targets for the five growth areas.

AstraZeneca is facing flat or declining revenue in coming years, as its best-selling drugs lose patent protection, but Mr. Soriot has focused on rebuilding the company's pipeline and returning it to growth.

Pfizer has been pursuing its British rival since November, but AstraZeneca has rejected the advances. Last week, AstraZeneca said Pfizer's most recent cash-and-stock proposal valued at GBP50 ($84) a share "substantially" undervalued the company. Tuesday, AstraZeneca shares were down 2.7% to GBP46.80 in afternoon London trading.

U.K. opposition leader Ed Miliband has called for an "immediate independent assessment" of whether Pfizer's proposed takeover is in the national interest, after accusing the U.K. government of "cheerleading" for the deal in an open letter to Prime Minister David Cameron.

A spokesman for Mr. Cameron said Tuesday that the government was unapologetic in its "active engagement" with both parties over a potential deal, stressing that any decision was a matter for the companies, their boards and shareholders.

Representatives from Pfizer and AstraZeneca will be called before a U.K. parliamentary committee in coming weeks to discuss the potential takeover, a representative from the Department for Business, Innovation and Skills said Tuesday. While a committee could ask difficult questions over a proposed deal, it would have no powers to block it.

AstraZeneca's strategy update comes a day after Pfizer sought to increase pressure on the British company to enter talks on creating the world's biggest pharmaceutical company. Pfizer also reported declining quarterly results that underscored why it is interested in a tie-up.

In an interview Monday, Pfizer Chief Executive Ian Read said the offer was "compelling" and urged the U.K.-based company to enter talks.

"I'm hoping they will come back into discussions, but we are reviewing our options," he said.

Mr. Read agreed that Pfizer's options include walking away from a potential deal and even looking for a different one, though he argued that a combination would benefit both companies and their shareholders.

He added that his talks with AstraZeneca shareholders suggest they are open to doing a deal and want to discuss the terms further.

While some AstraZeneca shareholders would be open to the company discussing a sale, many support the company's board in resisting Pfizer's approach, according to conversations The Wall Street Journal has had with people familiar with the talks.

Jonathan D. Rockoff and Nicholas Winning contributed to this article.

Write to Hester Plumridge at Hester.Plumridge@wsj.com

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