AMMAN, Jordan -- King Hussein, who has suffered a relapse of lymphatic cancer, might undergo a second stem cell transplant to try to fight the disease, sources in Jordan say.

Hussein had abruptly returned to the United States on Tuesday, only days after a triumphant homecoming from six months of cancer treatment.The Mayo Clinic in Rochester, Minn., announced Wednesday that the king was in "stable condition" but had suffered a relapse.

"He is receiving treatment for a relapse of non-Hodgkins lymphoma. His Majesty immediately began treatment upon arriving at Mayo clinic," said a statement issued on behalf of the king's doctors.

The sources in Jordan who said he might have a second transplant spoke on customary condition of anonymity.

Jordanians remained anxious over the king's health even as they gathered Wednesday to pay respects to their new crown prince.

Hundreds of people crowded into a hilltop palace to show support for Prince Abdullah, who Hussein this week named heir to the throne. The Royal Palace said another ceremony was scheduled today because of a flood of calls from Jordanians wishing to congratulate the prince.

The well-wishers at the palace reception included the king's brother, who was removed as crown prince Tuesday. Hassan hugged and kissed Abdullah.

The heavy turnout at the palace underlined the support for Hussein's decision to remove Hassan, who lacks Hussein's charisma.

Prince Abdullah has so far tried to avoid any possible rift with his uncle. In a letter to his father, Abdullah hinted that he will maintain warm relations with Hassan.

"The Hashemites are my family and the source of my pride, and I intend to keep love, mercy, selflessness . . . amongst us," he said.

While Wednesday's show of loyalty to Abdullah was reassuring to Jordanians, the king's illness was bewildering to many.